{"id":8637,"date":"2025-04-28T08:27:57","date_gmt":"2025-04-28T08:27:57","guid":{"rendered":"https:\/\/undetectable.ai/blog\/?p=8637"},"modified":"2026-01-09T16:09:28","modified_gmt":"2026-01-09T16:09:28","slug":"gpt-o1","status":"publish","type":"post","link":"https:\/\/undetectable.ai/blog\/gpt-o1\/","title":{"rendered":"Is GPT-o1 Content Detectable by AI Tools?"},"content":{"rendered":"\n<p>Can GPT o1 write content without getting caught by AI detectors?<\/p>\n\n\n\n<p>It\u2019s a fair question.&nbsp;<\/p>\n\n\n\n<p>In this article, you\u2019ll read that GPT o1 is a model that was trained to handle complex task related to the field of science, coding, and math.&nbsp;<\/p>\n\n\n\n<p>But hey, if it can write, and whether or not you can sneak it past AI detectors, is worth exploring.<\/p>\n\n\n\n<p>Here\u2019s what you\u2019ll walk away with after reading this article:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What Is GPT-o1?<\/li>\n\n\n\n<li>How AI Detectors Work?<\/li>\n\n\n\n<li>Can GPT-o1 Content Be Detected?<\/li>\n\n\n\n<li>Are OpenAI\u2019s o1-mini and o1-preview Truly Undetectable?<\/li>\n\n\n\n<li>How to Bypass AI Detectors with GPT-o1?<\/li>\n\n\n\n<li>GPT-o1 vs GPT-4o: Which Is More Detectable?<\/li>\n<\/ul>\n\n\n\n<p>So let\u2019s start.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is GPT-o1?<\/h2>\n\n\n\n<p>In September 2024, OpenAI launched GPT-o1-preview, alongside a lighter, more cost-efficient variant called o1-mini.&nbsp;<\/p>\n\n\n\n<p>By December 2024, the preview version was officially replaced by the full GPT-o1 model.&nbsp;<\/p>\n\n\n\n<p>According to OpenAI, GPT-o1 is made to tackle highly complex problems by dedicating more computational &#8220;thinking&#8221; time before generating responses.&nbsp;<\/p>\n\n\n\n<p>This includes advanced tasks like competitive programming, abstract mathematics, and scientific reasoning, which the model can handle with near-expert finesse.<\/p>\n\n\n\n<p>And the tests are evidence of this expertise.&nbsp;<\/p>\n\n\n\n<p>In benchmark testing, o1-preview ranked in the <a href=\"https:\/\/openai.com\/index\/introducing-openai-o1-preview\/\" target=\"_blank\" rel=\"noreferrer noopener\">89th percentile on Codeforces<\/a> competitions.<\/p>\n\n\n\n<p>On the <a href=\"https:\/\/en.wikipedia.org\/wiki\/American_Invitational_Mathematics_Examination\" target=\"_blank\" rel=\"noreferrer noopener\">American Invitational Mathematics Examination<\/a>, o1 solved 83% of problems (12.5\/15). By comparison, GPT-4o barely cracked 13% (1.8\/15).<\/p>\n\n\n\n<p>This model also showed PhD-level proficiency across multiple scientific domains (physics, chemistry, and biology).<\/p>\n\n\n\n<p>So it\u2019s clear that the model was made for research and technical applications, primarily.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-1024x464.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-300x136.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-768x348.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-18x8.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level.avif 1142w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-1024x464.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-300x136.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-768x348.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-18x8.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level.webp 1142w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-1024x464.jpg\" height=\"464\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-1024x464.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-300x136.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-768x348.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level-18x8.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/PhD-level.jpg 1142w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8642 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">How It Differs from GPT-3.5, GPT-4 &amp; GPT-4o<\/h3>\n\n\n\n<p>From GPT-o1\u2019s perspective, the differences to GPT-3.5, GPT-4 and GPT-4o are both subtle and stark, depending on the task at hand.<\/p>\n\n\n\n<p>GPT-3.5 operates on an older dataset with a limited 16,385 context window (4,096 output tokens) and offers basic reasoning and decent coding skills.&nbsp;<\/p>\n\n\n\n<p>It does okay with general prompts, but hand it a problem with nested logic or a tricky algorithm, and you&#8217;ll quickly see its edges. <\/p>\n\n\n\n<p>Compared to it GPT o1 operates in a different cognitive class. So, the comparison isn\u2019t right.<\/p>\n\n\n\n<p>GPT-4 remains solid, more refined than 3.5 and capable across a broader range of tasks, especially those needing nuance. But even it doesn\u2019t dig into technical complexity with the same rigor as o1.&nbsp;<\/p>\n\n\n\n<p>GPT-4o further refined speed and multimodal capabilities but still lagged in deep analytical tasks.<\/p>\n\n\n\n<p>It&#8217;s faster, more interactive, and better equipped for general-purpose use. It handles creative writing, chatting, and multimedia tasks better than o1 for now. <\/p>\n\n\n\n<p>But, when it comes to logic-heavy use cases, o1 holds a measurable lead.&nbsp;<\/p>\n\n\n\n<p>That said, GPT-o1 lacks some user-friendly features like web browsing or file uploads, which GPT-4o supports.<\/p>\n\n\n\n<p>The mode can also be a little terse. Its refusal responses are shorter, which sometimes skip over references or deeper explanations that 4o tends to include.&nbsp;<\/p>\n\n\n\n<p>Another major caveat of o1 is that it can amplify risks when addressing dangerous queries. <\/p>\n\n\n\n<p>For example, when asked about rock-climbing techniques, <a href=\"https:\/\/openai.com\/index\/openai-o1-system-card\/\" target=\"_blank\" rel=\"noreferrer noopener\">GPT-o1\u2019s in-depth engagement could encourage over-reliance<\/a>, whereas GPT-4o defaults to generic advice.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences.avif 715w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences-300x172.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences-18x10.avif 18w\" sizes=\"auto, (max-width: 715px) 100vw, 715px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences.webp 715w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences-300x172.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences-18x10.webp 18w\" sizes=\"auto, (max-width: 715px) 100vw, 715px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences.jpg\" height=\"409\" width=\"715\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences.jpg 715w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences-300x172.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/human-preferences-18x10.jpg 18w\" sizes=\"auto, (max-width: 715px) 100vw, 715px\" class=\"wp-image-8643 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p class=\"has-text-align-center\">[<a href=\"https:\/\/openai.com\/index\/learning-to-reason-with-llms\/\" target=\"_blank\" rel=\"noreferrer noopener\">source<\/a>]<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Feature<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>GPT-3.5<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>GPT-4<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>GPT-4o<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>GPT o1<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Training Data<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Older dataset<\/td><td class=\"has-text-align-center\" data-align=\"center\">More recent &amp; extensive<\/td><td class=\"has-text-align-center\" data-align=\"center\">Most up-to-date<\/td><td class=\"has-text-align-center\" data-align=\"center\">Most up-to-date<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Output tokens<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4,096 tokens&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">8,192 tokens&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">16,384 tokens<\/td><td class=\"has-text-align-center\" data-align=\"center\">100,000 tokens&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Context window<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">16,385<\/td><td class=\"has-text-align-center\" data-align=\"center\">8,192<\/td><td class=\"has-text-align-center\" data-align=\"center\">128,000<\/td><td class=\"has-text-align-center\" data-align=\"center\">200,000<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Accuracy &amp; Coherence<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Good<\/td><td class=\"has-text-align-center\" data-align=\"center\">Significantly improved<\/td><td class=\"has-text-align-center\" data-align=\"center\">High<\/td><td class=\"has-text-align-center\" data-align=\"center\">Exceptional<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Reasoning Abilities<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Basic<\/td><td class=\"has-text-align-center\" data-align=\"center\">Advanced<\/td><td class=\"has-text-align-center\" data-align=\"center\">Advanced<\/td><td class=\"has-text-align-center\" data-align=\"center\">PhD-level<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Coding Skills<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Decent<\/td><td class=\"has-text-align-center\" data-align=\"center\">Proficient<\/td><td class=\"has-text-align-center\" data-align=\"center\">Proficient<\/td><td class=\"has-text-align-center\" data-align=\"center\">Near expert-level<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Creative Writing<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Capable<\/td><td class=\"has-text-align-center\" data-align=\"center\">More creative &amp; nuanced<\/td><td class=\"has-text-align-center\" data-align=\"center\">Fast, creative<\/td><td class=\"has-text-align-center\" data-align=\"center\">Not feasible<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Response Speed<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Fast<\/td><td class=\"has-text-align-center\" data-align=\"center\">Moderate<\/td><td class=\"has-text-align-center\" data-align=\"center\">Fastest<\/td><td class=\"has-text-align-center\" data-align=\"center\">Slower (deliberate)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Best For<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Casual use<\/td><td class=\"has-text-align-center\" data-align=\"center\">General tasks<\/td><td class=\"has-text-align-center\" data-align=\"center\">Speed + multitasking<\/td><td class=\"has-text-align-center\" data-align=\"center\">Technical depth<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How AI Detectors Work<\/h2>\n\n\n\n<p>AI detectors have become increasingly common in the post-GPT boom.<\/p>\n\n\n\n<p>Their purpose is to figure out whether something was written by a person or spit out by a model like GPT-o1.<\/p>\n\n\n\n<p>They make a guess based on a bunch of nerdy metrics and four major machine learning and NLP concepts.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-1024x683.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-300x200.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-768x512.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-1024x683.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-300x200.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-768x512.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-1024x683.jpg\" height=\"683\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-1024x683.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-300x200.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-768x512.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/how-AI-detectors-work-1.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8658 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">Classifier<\/h3>\n\n\n\n<p>The main brain of these detectors is called a classifier.<\/p>\n\n\n\n<p>These classifiers are trained on massive datasets labeled as either AI-generated or human-written, and over time they learn what sets the two apart.<\/p>\n\n\n\n<p>Once the model is trained, it can assess a new chunk of text and decide where it likely belongs on that AI\u2013human spectrum.<\/p>\n\n\n\n<p>It checks how often certain words show up, how long the sentences are, and whether the whole thing sounds too squeaky clean.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Embeddings<\/h3>\n\n\n\n<p>Since computers can\u2019t grasp language in the way we do, embeddings convert words into mathematical vectors that represent meaning, context, and word relationships.<\/p>\n\n\n\n<p>So when a detector analyzes a sentence, it\u2019s looking at where words live in this multi-dimensional vector space and how their positions relate to patterns seen in either human or AI outputs. <\/p>\n\n\n\n<p>It\u2019s how the system knows that \u201cqueen\u201d and \u201cking\u201d are things that go together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Perplexity<\/h3>\n\n\n\n<p>In AI detection, perplexity is a metric that measures how predictable a piece of writing is.<\/p>\n\n\n\n<p>AI-generated content tends to have lower perplexity because it aims to produce text that flows logically and reads clearly.&nbsp;<\/p>\n\n\n\n<p>Human writing, meanwhile, can be messier. It\u2019s richer in unpredictability, creative leaps, or straight-up weird phrasing.&nbsp;<\/p>\n\n\n\n<p>So, a low perplexity score can be a clue that something came from an AI, but it\u2019s never used in isolation because, well, even humans like to sound obvious sometimes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Burstiness<\/h3>\n\n\n\n<p>Burstiness measures how much variety your writing has.&nbsp;<\/p>\n\n\n\n<p>Human authors usually show higher burstiness because we naturally mix things up between short, snappy lines next to sprawling, complex ones.<\/p>\n\n\n\n<p>AI tends to play it safe. It doesn\u2019t take weird detours or suddenly go off the rails mid-thought. And that makes it easier to spot.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can GPT-o1 Content Be Detected?<\/h2>\n\n\n\n<p>Chat GPT o1 isn\u2019t available for free and is neither part of the regular Plus plan anymore.&nbsp;<\/p>\n\n\n\n<p>It\u2019s been bumped up to OpenAI\u2019s Pro plan, which starts at a steep $200.<\/p>\n\n\n\n<p>Now, even though we don\u2019t have full public access to test GPT o1 ourselves, we can still make an educated guess about its detectability.<\/p>\n\n\n\n<p>OpenAI made it pretty clear that this model was built with STEM in mind.&nbsp;<\/p>\n\n\n\n<p>So based on that, it&#8217;s a safe bet that the model\u2019s ability to mimic human writing is would be pretty average, if not entirely bad.<\/p>\n\n\n\n<p>Thanks to a couple of YouTube channels that posted sample outputs from Chat GPT o1 models\u2014specifically the o1-mini and o1-preview\u2014we got to run those texts through popular detection tools and see what kind of red flags pop up.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Are OpenAI\u2019s o1-mini and o1-preview Truly Undetectable?<\/h2>\n\n\n\n<p>We pulled two text samples straight from YouTube videos that ran prompts through o1-preview and o1-mini. <\/p>\n\n\n\n<p>Let\u2019s see if their outputs can actually slip past AI detectors without raising alarms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is o1-preview Detectable?<\/h3>\n\n\n\n<p>We selected a text sample from a <a href=\"https:\/\/youtu.be\/c6j1DUEFd_4?si=StbiNyDDcib1Eg2O&amp;t=245\" target=\"_blank\" rel=\"noreferrer noopener\">video by The Nerdy Novelist<\/a>, where the o1-preview model generated a short article titled \u201cHelen of Troy: The Face that Launched a Thousand Ships\u201d.&nbsp;<\/p>\n\n\n\n<p>We focused on the intro and the first two headings, which were 265 words in total.<\/p>\n\n\n\n<p>We threw the text into <a href=\"https:\/\/undetectable.ai\/?showAIDetector=true\" target=\"_blank\" rel=\"noreferrer noopener\">Undetectable AI<\/a>, <a href=\"https:\/\/quillbot.com\/ai-content-detector\" target=\"_blank\" rel=\"noreferrer noopener\">QuillBot<\/a>, and <a href=\"https:\/\/originality.ai\/ai-checker\" target=\"_blank\" rel=\"noreferrer noopener\">Originality.ai<\/a>, just to cover all the bases.<\/p>\n\n\n\n<p>Undetectable AI was not impressed. It flagged 99% of the content as AI-generated and didn\u2019t stop there. <\/p>\n\n\n\n<p>It also predicted that other detectors\u2014like QuillBot, ZeroGPT, and Grammarly\u2014would come to the same conclusion. So, let\u2019s confirm this by running the text through QuillBot.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-1024x814.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-300x239.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-768x611.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-15x12.avif 15w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1.webp 1050w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-1024x814.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-300x239.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-768x611.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-15x12.webp 15w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1.webp 1050w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-1024x814.jpg\" height=\"814\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-1024x814.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-300x239.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-768x611.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1-15x12.jpg 15w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/advanced-AI-detector-1.jpg 1050w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8646 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>QuillBot followed suit. It flagged the text as 100% likely AI.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-1024x688.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-300x202.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-768x516.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result.avif 1316w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-1024x688.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-300x202.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-768x516.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result.webp 1316w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-1024x688.jpg\" height=\"688\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-1024x688.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-300x202.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-768x516.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-result.jpg 1316w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8647 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>But it likes to give a benefit of doubt. You can hover over different parts of the text and see the confidence levels: low, moderate, high.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-1024x643.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-300x188.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-768x482.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2.webp 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-1024x643.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-300x188.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-768x482.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2.webp 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-1024x643.jpg\" height=\"643\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-1024x643.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-300x188.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-768x482.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/quillbot-result-2.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8648 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>And then there\u2019s Originality.ai. It came in with 100% confidence that the text was AI-written. Not 98%. Not 99. 100. And it doesn\u2019t use the word \u201clikely\u201d even.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-1024x740.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-300x217.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-768x555.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01.webp 1231w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-1024x740.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-300x217.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-768x555.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01.webp 1231w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-1024x740.jpg\" height=\"740\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-1024x740.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-300x217.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-768x555.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/originality-AI-result-01.jpg 1231w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8650 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\">Is o1-mini Detectable?<\/h3>\n\n\n\n<p>Now let\u2019s talk about o1-mini.&nbsp;<\/p>\n\n\n\n<p>The text we used here is from <a href=\"https:\/\/youtu.be\/Y3p54JaZels?si=As6Hgg69dLqHYzDx\" target=\"_blank\" rel=\"noreferrer noopener\">another YouTuber<\/a> who used a much better prompt, and it shows. The writing had more personality and a more human flow to it.<\/p>\n\n\n\n<p>The AI detectors noticed too. QuillBot called this one about 45% AI, 55% human. That\u2019s actually a decent result. <\/p>\n\n\n\n<p>If you just gave it a quick read without checking, you might even believe a person wrote it.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-1024x777.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-300x228.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-768x583.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-16x12.avif 16w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45.webp 1206w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-1024x777.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-300x228.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-768x583.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-16x12.webp 16w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45.webp 1206w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-1024x777.jpg\" height=\"777\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-1024x777.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-300x228.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-768x583.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45-16x12.jpg 16w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-Result-45.jpg 1206w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8651 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>But don\u2019t get too comfortable. Undetectable AI and Originality.ai weren\u2019t fooled. <\/p>\n\n\n\n<p>They both still called it AI with 99% and 100% certainty, respectively. So even with a better prompt, the writing couldn\u2019t clear the fence.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-1024x766.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-300x224.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-768x575.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-16x12.avif 16w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99.webp 1112w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-1024x766.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-300x224.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-768x575.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-16x12.webp 16w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99.webp 1112w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-1024x766.jpg\" height=\"766\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-1024x766.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-300x224.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-768x575.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99-16x12.jpg 16w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-AI-result-99.jpg 1112w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8652 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-1024x628.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-300x184.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-768x471.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002.webp 1221w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-1024x628.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-300x184.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-768x471.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002.webp 1221w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-1024x628.jpg\" height=\"628\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-1024x628.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-300x184.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-768x471.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-AI-result-002.jpg 1221w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8653 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>Which brings us to the bottom line: OpenAI\u2019s o1-preview and o1-mini are definitely detectable, especially if you use an <a href=\"https:\/\/undetectable.ai\/\" target=\"_blank\" rel=\"noreferrer noopener\">Undetectable\u2019s AI detector<\/a>.&nbsp;<\/p>\n\n\n\n<p>You can tweak your prompt, rephrase your sentences, maybe even fool one tool here and there. But Chat GPT o1 still has high chances of being detected as AI detection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Bypass AI Detectors with GPT-o1<\/h2>\n\n\n\n<p>So you\u2019ve got your shiny new text straight from GPT o1\u2014clean, fast, and eerily coherent. Great. But now comes the real trick: making it look like a human actually wrote it.&nbsp;<\/p>\n\n\n\n<p>Once GPT o1 has done its job, you don\u2019t just post it raw. You need to make it look like a human wrote it.<\/p>\n\n\n\n<p>But instead of doing it manually, you can do it through AI humanizers.&nbsp;<\/p>\n\n\n\n<p>These tools know how to take robotic-sounding text and give it a little human weirdness. The kind that detectors struggle to decode.<\/p>\n\n\n\n<p>But here\u2019s the thing. There are quite a few tools out there for this purpose that promise to \u201chumanize\u201d your text but end up making it sound like a badly rehashed text.<\/p>\n\n\n\n<p>That\u2019s why Undetectable AI deserves some spotlight. <\/p>\n\n\n\n<p>Our suite of tools like <a href=\"https:\/\/undetectable.ai\/ai-humanizer\" target=\"_blank\" rel=\"noreferrer noopener\">Humanizer<\/a>, <a href=\"https:\/\/undetectable.ai\/ai-stealth-writer\" target=\"_blank\" rel=\"noreferrer noopener\">Stealth Writer<\/a>, and <a href=\"https:\/\/undetectable.ai\/paraphrasing-tool\" target=\"_blank\" rel=\"noreferrer noopener\">Paraphraser<\/a> actually understand how AI detectors think.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Humanizer tweaks the flow and phrasing just enough to fly under the radar.&nbsp;<\/li>\n\n\n\n<li>Stealth Writer adds variation in sentence structure, which is key for confusing classifiers.&nbsp;<\/li>\n\n\n\n<li>And the Paraphraser reshapes the text while keeping the original meaning intact.<\/li>\n<\/ul>\n\n\n\n<p>Basically, these tools know the language of AI, and they know how to throw it off its game.<\/p>\n\n\n\n<p>So, if you\u2019re using GPT o1 for writing, and you want your work to pass as human, don\u2019t skip the post-processing step. <\/p>\n\n\n\n<p>Even a little cleanup using Undetectable AI can make a big difference in beating detection tools.<\/p>\n\n\n\n<p>Discover our AI Detector and Humanizer right in the widget below!<\/p>\n\n\n\n<div id=\"uai-widget\" data-affiliate-link=\"https:\/\/undetectable.ai\/?_by=hi4km\"><script>var js = document.createElement(\"script\");js.async = true;js.src = \"https:\/\/widget.undetectable.ai\/js\/widget-loader.js?t=\"+Date.now();document.getElementsByTagName(\"head\")[0].appendChild(js);<\/script><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">GPT-o1 vs GPT-4o: Which Is More Detectable?<\/h2>\n\n\n\n<p>We already talked about how GPT o1 leans heavily into math and science, while GPT-4o\u2019s got a bit more finesse when it comes to language. But how do GPT o1 vs 4o compare in writing?<\/p>\n\n\n\n<p>First, we used this prompt to generate 400 words of content using GPT 4o:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1024x678.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-300x199.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-768x509.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1536x1018.avif 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o.avif 1546w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1024x678.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-300x199.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-768x509.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1536x1018.webp 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o.webp 1546w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1024x678.jpg\" height=\"678\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1024x678.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-300x199.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-768x509.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-1536x1018.jpg 1536w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/ChatGPT-4o.jpg 1546w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8654 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>Then, we ran GPT-4o\u2019s output through the same three AI detectors: Undetectable AI, QuillBot, and Originality.ai.<\/p>\n\n\n\n<p>Undetectable AI flagged 99% of the content as AI. That\u2019s some impressive AI detection, isn\u2019t it?<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1024x602.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-300x176.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-768x451.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1536x902.avif 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1024x602.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-300x176.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-768x451.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1536x902.webp 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1024x602.jpg\" height=\"602\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1024x602.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-300x176.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-768x451.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-1536x902.jpg 1536w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Undetectable-flagged-99.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8655 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>Then QuillBot came in and said, \u201cNot so fast.\u201d It flagged 73% of the same text as AI-generated, an even harsher judgment than it gave to GPT o1-mini, which it scored at 45%.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1024x634.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-300x186.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-768x476.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1536x951.webp 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-18x12.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1024x634.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-300x186.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-768x476.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1536x951.webp 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-18x12.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1024x634.jpg\" height=\"634\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1024x634.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-300x186.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-768x476.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-1536x951.jpg 1536w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73-18x12.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Quillbot-flagged-73.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8656 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>Originality.ai was still stuck in full suspicion mode. It clocked GPT-4o\u2019s content at 100% AI, same as always.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1024x530.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-300x155.avif 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-768x397.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1536x795.avif 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-18x9.avif 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1024x530.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-300x155.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-768x397.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1536x795.webp 1536w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-18x9.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1024x530.jpg\" height=\"530\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1024x530.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-300x155.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-768x397.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-1536x795.jpg 1536w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion-18x9.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/04\/Originality-full-suspicion.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-8657 sp-no-webp\" alt=\"\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>So what does all this mean? Most Ai detectors like Undetectable AI and Orginality AI are good at catching ChatGPT o1 and 4o text. <\/p>\n\n\n\n<p>But if we\u2019re keeping score, GPT o1 is clearly more detectable. Across multiple detectors, it was consistently flagged at 99\u2013100% AI, even with improved prompting.&nbsp;<\/p>\n\n\n\n<p>And honestly, that makes sense. GPT o1 wasn\u2019t built to be a language model. It\u2019s a STEM-first model, built to solve problems.&nbsp;<\/p>\n\n\n\n<p>GPT-4o, on the other hand, knows how to sound more natural, especially when paired with a solid prompt.<\/p>\n\n\n\n<p>So if you\u2019re choosing between the two for writing tasks where stealth matters, GPT-4o is your better shot at slipping past the radar.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><picture><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-1024x301.avif 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-300x88.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-768x226.avif 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-18x5.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver.avif 1435w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/avif\"><source srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-1024x301.webp 1024w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-300x88.webp 300w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-768x226.webp 768w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-18x5.webp 18w,https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver.webp 1435w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" type=\"image\/webp\"><img src=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-1024x301.jpg\" height=\"301\" width=\"1024\" srcset=\"https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-1024x301.jpg 1024w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-300x88.jpg 300w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-768x226.jpg 768w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver-18x5.jpg 18w, https:\/\/undetectable.ai/blog\/wp-content\/uploads\/2025\/10\/Undetectable-AI-Math-Solver.jpg 1435w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" class=\"wp-image-16758 sp-no-webp\" alt=\"Undetectable AI&#039;s Math Solver screenshot\" loading=\"lazy\" decoding=\"async\"  > <\/picture><\/figure><\/div>\n\n\n<p>You can also use Undetectable AI\u2019s <a href=\"https:\/\/undetectable.ai\/math-solver\" target=\"_blank\" rel=\"noreferrer noopener\">Math Solver<\/a> to see how models like GPT-o1 handle structured problem solving, since it breaks equations into clear steps that make their reasoning easier to evaluate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Verdict: Is GPT-o1 Detectable?<\/h2>\n\n\n\n<p>Our findings conclude that yes, GPT o1 is detectable.&nbsp;<\/p>\n\n\n\n<p>Even with decent prompt engineering, the text it generates still trips up most AI detectors.&nbsp;<\/p>\n\n\n\n<p>But to be fair, writing wasn&#8217;t the job it was trained to do. GPT o1 was built for STEM-related tasks like solving equations, coding, and crunching data.<\/p>\n\n\n\n<p>So if you&#8217;re trying to whip up content that actually sounds human, GPT o1 probably isn&#8217;t the model for that. You&#8217;re better off using GPT-4o, which has more language fluency, or better yet, using a tool built specifically for writing undetectable AI content.<\/p>\n\n\n\n<p>That\u2019s where Undetectable AI steps in.&nbsp;<\/p>\n\n\n\n<p>Our <a href=\"https:\/\/undetectable.ai\/ai-humanizer\" target=\"_blank\" rel=\"noreferrer noopener\">AI Humanizer<\/a> rewrites your content in a way that sounds natural, nuanced, and convincingly human.&nbsp;<\/p>\n\n\n\n<p>Whether you\u2019re writing blog posts, essays, or product descriptions, it adapts to your topic without setting off AI detection alarms.<\/p>\n\n\n\n<p>And speaking of alarms, if you want to test how detectable your content really is (whether it\u2019s from GPT o1, GPT-4o, or any other model) our AI Detector is one of the most accurate tools on the market.<\/p>\n\n\n\n<p>So, skip the guesswork.<\/p>\n\n\n\n<p>Try <a href=\"https:\/\/undetectable.ai\/\" target=\"_blank\" rel=\"noreferrer noopener\">Undetectable AI<\/a> today.<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":15,"featured_media":8641,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-8637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-reviews"],"_links":{"self":[{"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/posts\/8637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/comments?post=8637"}],"version-history":[{"count":6,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/posts\/8637\/revisions"}],"predecessor-version":[{"id":18912,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/posts\/8637\/revisions\/18912"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/media\/8641"}],"wp:attachment":[{"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/media?parent=8637"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/categories?post=8637"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/undetectable.ai/blog\/wp-json\/wp\/v2\/tags?post=8637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}