Multi-Engine AI Detection

Detect ChatGPT Writing — Free Measured AI Checker

Worried your text sounds like ChatGPT? Three independent engines give you certainty, not a guess.

Method and limits published·A result is not proof of authorship or misconduct. We publish measured error rates by language and register, with the scope each verdict covers.·See methodology →

Free scan: we analyze your first ~300 characters

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|||.pdf, .docx, .txt

Writer:Text Type:

0-30: Likely Human31-70: Uncertain71-100: Likely AI

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Why Multi-Engine Detection?

Single AI detectors disagree on 15-30% of texts. OmniDetect combines three independent engines for consensus — dramatically reducing false positives.

3 Independent Engines

Your text goes to the engine measured most accurate for its language, and the reasons behind the verdict come with it.

Consensus-Based Scoring

And when the reading is not confident enough to stand behind, we say so instead of printing a number.

Your text, your call

Your document stays in your history until you delete it, and you can delete it at any time. We do not sell it. GDPR compliant.

Can AI Detectors Detect Claude?

Claude (by Anthropic) produces some of the most natural-sounding AI text on the market. Its Constitutional AI training makes Claude outputs particularly challenging for single-engine detectors — our benchmark shows individual engines miss Claude text 10-15% more often than ChatGPT text.

This is exactly why we test detectors instead of stacking them. Combining a weak engine with a strong one moves the answer toward the weak one — on our frozen corpus, false-positive rates on the same English academic writing span 1.0% to 66.7% depending on the engine. So your text goes to the one measured most accurate for its language, and we publish how often it is wrong.

Whether your text was written by ChatGPT, Claude, or any other AI model — OmniDetect gives you certainty, not a guess.

Frequently Asked Questions

Can OmniDetect detect ChatGPT writing?

Yes. Your text goes to the engine measured most accurate for its language on our own frozen corpus. On English machine-written text it caught 100% of the samples we tested, including four kinds of rewriting meant to evade detection — the per-register figures are published on our accuracy page.

Is ChatGPT detection accurate?

Single-engine detectors often disagree on ChatGPT text. We measure our detection channels on a frozen corpus split by language and register, and publish the numbers — including where they get worse — on our accuracy page.

Can ChatGPT-4o evade detection?

GPT-4o produces more natural text than earlier versions, but measured engine routing still catches the majority. On our frozen English corpus it caught 100% of machine-written samples, including GPT-4o.

How many words can I check for free?

You can scan the first ~300 characters for free with analysis by a real commercial engine, 3 times per day. Sign up for 1,000 free Word Tokens to unlock all the measured engine on the full text.

Stop guessing. Start knowing.

Paste your text above and get multi-engine consensus in seconds.

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