Most AI detectors were built before DeepSeek and Grok existed. GPTOne is one of the only free detectors trained specifically on DeepSeek V3, DeepSeek R1 and Grok 3 outputs, so content from the newest and fastest-growing models does not slip through your review.
Most AI detectors in operation today were trained exclusively on GPT-3.5 and GPT-4 data. GPTOne is one of the only free tools that adds dedicated training for DeepSeek and Grok, so newer and faster-growing models do not go undetected.
Full coverage of all major versions from DeepSeek-V2 through DeepSeek-V3, DeepSeek-R1, and DeepSeek-R2. The reasoning model outputs from DeepSeek-R1 show structural patterns distinct from other AI families that most detectors are not calibrated for.
99.99% accuracyFull coverage across Grok 1, Grok 2, and Grok 3 including Grok 3 mini. xAI's models are embedded in the X platform and increasingly used for long-form writing. GPTOne is calibrated for all production Grok variants.
99.99% accuracyDetection extends across all ChatGPT, Claude, and Gemini variants so a single scan covers everything from GPT-4o to DeepSeek R1. No need to choose which model family to test for.
99.99% accuracyFalse positive rate below 5% across all model families including DeepSeek and Grok. Human-authored text is not penalized even when it shares formal register or structured argument style with AI output.
<5% false positivesAlso see: Meta and Mistral AI Detector · ChatGPT, Claude and Gemini AI Detector
No account, no plugins, no waiting. GPTOne's multi-model classifier runs your text against all supported AI model families simultaneously, including DeepSeek and Grok.
Copy any essay, cover letter, blog post, or document into GPTOne's free detector. No formatting required. Plain text works best.
GPTOne's classifier checks simultaneously for statistical patterns specific to DeepSeek V3, DeepSeek R1, Grok 3, ChatGPT, Claude, and Gemini. All model families are tested in a single pass, not one at a time.
You receive an overall AI probability score plus highlighted sections showing exactly which passages drove the score so you know where to look, not just what the number is.
Use the result as a first-pass signal. For high-stakes decisions, combine with workflow guidance in GPTOne's detection guides for educators, HR teams, and content platforms.
Most AI detectors do not publish DeepSeek or Grok accuracy figures because they were not trained on those models. GPTOne is one of the only tools that separates these benchmarks and provides full free access to coverage.
| Detector | DeepSeek accuracy | Grok accuracy | False positive rate | Trained on DeepSeek | Trained on Grok | Free to use |
|---|---|---|---|---|---|---|
| GPTOne Best | 99.99% | 99.99% | <5% | ✓ | ✓ | ✓ Full access |
| GPTZero | N/A | N/A | 6.8% | ✗ | ✗ | Limited tier |
| Copyleaks | N/A | N/A | 5.1% | ✗ | ✗ | Limited tier |
| ZeroGPT | N/A | N/A | 8.4% | ✗ | ✗ | ✓ Full access |
N/A indicates the competitor tool does not publish model-specific benchmarks for DeepSeek or Grok, or is not trained on those model families. False positive rate figures are estimates based on GPTOne's internal comparative benchmark testing and independently reported user studies. GPTOne figures reflect internal benchmark data. No tool has been independently peer-reviewed.
DeepSeek and Grok are being used in classrooms, hiring pipelines, and content workflows right now. GPTOne is one of the only free tools that detects both, alongside ChatGPT, Claude, and Gemini.
Students use ChatGPT, Claude, Gemini, DeepSeek, and Grok for assignments. DeepSeek in particular has surged among international students due to its free availability and strong multilingual output. GPTOne detects all of them with section-level precision to support a fair review process.
Academic integrityGrok is integrated into X and used for cover letter drafting. DeepSeek is widely used by candidates seeking a free ChatGPT alternative. GPTOne detects both and keeps false positive rates below 5% so strong human-written candidates are not wrongly screened out.
Hiring screeningContributor content from DeepSeek or Grok shows different statistical patterns than content from ChatGPT or Claude. GPTOne's multi-model scan gives editorial teams a complete picture across all AI writing tools, not just the ones that were in the news when the policy was written.
Content QAWhen policy or regulation requires verification that content is human-authored, the requirement does not stop at ChatGPT. DeepSeek and Grok are in active use, and a detection tool that does not cover them leaves a meaningful gap in any compliance workflow.
ComplianceAlso see coverage for other model families: Meta and Mistral AI Detector
GPTOne covers all major DeepSeek model versions including DeepSeek-V2, DeepSeek-V3, DeepSeek-R1, and DeepSeek-R2. The reasoning outputs from DeepSeek-R1 exhibit structural patterns that are distinct from other AI families, and GPTOne is specifically calibrated to recognize them. As DeepSeek releases new versions, training data is updated to maintain coverage.
Yes. GPTOne covers Grok 1, Grok 2, Grok 3, and Grok 3 mini from xAI. Coverage extends to long-form writing produced through the X platform's integrated Grok assistant as well as direct API usage. All major Grok variants are included in the default scan with no additional configuration required.
The majority of AI detectors were trained before DeepSeek and Grok existed or became widely used. They learned statistical patterns specific to GPT-3.5 and GPT-4, not to the writing patterns produced by models trained on different data pipelines and with different architectural choices. DeepSeek and Grok produce measurably different output distributions that a GPT-trained classifier does not reliably flag. In comparative testing, GPT-focused tools showed false negative rates above 25% on DeepSeek R1 content.
Yes. DeepSeek-R1 is a reasoning model whose outputs often include structured internal deliberation before arriving at a final answer. This produces structural patterns unlike those of standard generative models such as GPT-4o or Claude Sonnet. GPTOne's classifier includes dedicated training data for DeepSeek-R1 reasoning outputs so that the final text produced by R1, even when stripped of reasoning traces, is reliably identified.
Yes. Full multi-model detection covering DeepSeek V2, V3, R1, R2, Grok 1, 2, 3, Grok 3 mini, ChatGPT, Claude, and Gemini is completely free with no account required. Paste your text at gptone.me and results appear within seconds. The free tier covers the core detection use case without requiring a login or a word-count limit on individual scans.
Yes. GPTOne's detection model is updated when significant new versions are released by DeepSeek and xAI. New training data is collected from each new model version and the classifier is updated before or shortly after each public release. This is why GPTOne is one of the only free tools with verified coverage of DeepSeek-R2 and Grok 3. A single blended accuracy score can look strong even when coverage of newer models is weak, which is why GPTOne publishes separate benchmarks by model family.
Complete model coverage
Every major AI model family in one free tool. Follow the links below for model-specific detection guides.
The only free AI detector trained specifically on DeepSeek and Grok outputs. No account. No cost. Results in seconds.
Run a free multi-model AI scanFree forever · No sign-up · DeepSeek · Grok · ChatGPT · Claude · Gemini