TheChecker.AI — AI Content Detector for Claude, GPT-5 & Gemini

93% Detection Accuracy Across 40+ AI Models

TheChecker.AI identifies AI-generated text from Claude 3, GPT-5, Gemini Ultra, Llama, and 40+ other models, including emerging systems. The detection engine is continuously updated as new models are released.

Know whether a draft reads as machine-written before your school or editor sees it.

Perplexity, Burstiness & Sentence-Level Scoring

Proprietary models examine perplexity, burstiness, and statistical patterns at the sentence level, checking 14+ statistical language markers. Each analysis includes sentence-level scoring and confidence assessments.

See exactly where in a text the AI signals appear, not just an overall verdict.

Instant Results in Seconds

Results are processed in around 2.3 seconds, with no complex setup or technical knowledge required. The process runs in three steps: paste your text, run the AI analysis, and get detailed results with model identification and confidence scores.

Check a draft quickly and still have time to revise it.

AI Humanizer That Keeps Your Meaning

The humanizer rewrites flat, machine-sounding lines so a draft reads naturally while keeping your meaning, figures, and names intact. Try it free on a paragraph, then create a free account for 1,000 words.

Turn an AI-assisted draft into writing that sounds like you.

Model Context Protocol for Claude and MCP Clients

Connect the AI detector and humanizer to Claude — or any MCP client — as native tools via POST api.thechecker.ai/mcp. The detect_ai_content tool scores any text for AI-generated content from the chat, and humanize_text rewrites AI text without leaving Claude. Self-serve OAuth takes under a minute, with the same account and limits.

Run detection and humanizing inside your chat window instead of copy-pasting between tabs.

Privacy-Secure Handling of Your Scans

Free detector demo checks are not saved. Scans you run from your account are saved to it.

Try the detector on a draft without it being stored.

• 93% Detection AccuracyTheChecker.AI achieves 93% accuracy in detecting AI-generated content across 40+ models including Claude 3, GPT-5, Gemini Ultra, Llama, and other popular AI systems.
• Broad Model CoverageDetects AI-generated text from Claude, GPT-5, Gemini, and 40+ models, with comprehensive coverage of ChatGPT, Claude, Gemini, Llama, and emerging models.
• Instant AnalysisGet results in seconds for all major AI models including latest releases. Results processed in 2.3 seconds.
• Privacy for Free Demo ChecksFree detector demo checks are not saved. Scans you run from your account are saved to it.

• Accuracy Claim ScopeThe 93% accuracy figure is stated for detecting AI-generated content across 40+ models including Claude 3, GPT-5, Gemini Ultra, Llama, and other popular AI systems. The site does not provide independent verification or per-model accuracy breakdowns.
• Demo Result VariabilityThe demo shows an Overall AI Probability of 99.86% for a passage about Dostoevsky's White Nights, while another example shows an AI Probability Score of 96%. These are illustrative outputs and may not represent typical results.
• Humanizer Word LimitsThe humanizer is free to try on a paragraph, then a free account allows 1,000 words. Paid plans include 5,000 humanizer words per month.
• MCP Integration DetailsThe Model Context Protocol integration connects the AI detector and humanizer to Claude or any MCP client as native tools, using the same engines, same account, and self-serve OAuth under a minute. The endpoint is POST api.thechecker.ai/mcp with tools detect_ai_content and humanize_text.

Students checking drafts before submission

TheChecker.AI is built for students who want to read their own draft the way their school will while they can still change it. With 93% detection accuracy across Claude 3, GPT-5, Gemini Ultra and 40+ AI models, and 500+ educational institutions cited on the site, it gives a sentence-level view of where a draft stands before it is handed in. Those who also want to check for copied passages can pair it with Turnitin.

Writers and professionals protecting their voice

For professionals making sure their own writing does not read as machine-written, TheChecker.AI reports an AI probability score alongside perplexity and burstiness analysis, checking 14+ statistical language markers with results in seconds. The AI Humanizer then rewrites flat, machine-sounding lines so the draft reads naturally while keeping meaning, figures and names intact. Writers who want a second opinion on originality can also run text through Originality.AI.

Editors reviewing incoming submissions

Editors reviewing what came in can use TheChecker.AI to see where a piece stands, with paragraph-level analysis and confidence assessments rather than a single opaque number. The site notes 2M+ documents analyzed and 10,000+ writers trusting the tool, and free detector demo checks are not saved while account scans are stored to the account. For a broader plagiarism cross-check on submitted work, Copyleaks is a natural companion.

Working inside Claude via Model Context Protocol

TheChecker.AI can be connected to Claude or any MCP client as native tools through self-serve OAuth in under a minute, using the same account and limits. Two tools are exposed: detect_ai_content scores any text for AI-generated content right from the chat, and humanize_text rewrites AI text to read naturally without leaving Claude. Users who prefer a dedicated standalone detector alongside it can compare results with Gptzero me.

Open the free demo without creating an account.

Paste your text into the demo to analyze it.

Create a free account to humanize up to 1,000 words.

Upgrade to a paid plan starting at $9.90 per month.