Free Claude AI Detector — Detect Claude Text
Detect text from Anthropic's Claude 3, Claude 3.5 Sonnet, and Claude Opus. Real-time AI analysis, no account needed.
Paste text & click Analyze, or try a sample
How Claude AI Text Is Detected#
Claude produces text with a characteristically thoughtful, structured style — nuanced qualifications, balanced arguments, and a slightly literary register. Our Claude AI detector identifies these linguistic patterns alongside standard AI signals like perplexity and burstiness to determine if text was generated by Claude.
Claude vs ChatGPT vs Human Writing#
Claude output often includes more hedging language ("It's worth noting that..."), more explicit argument structure, and longer, more complex sentence constructions than ChatGPT. This distinguishes it from both GPT output and typical human writing. Our detector recognizes these Claude-specific patterns.
Supported Claude Versions#
- Claude 3 Haiku, Sonnet, and Opus
- Claude 3.5 Sonnet and Haiku
- Claude 4 and Claude 4 Sonnet
- Earlier Claude 2 and Claude Instant models
Claude Detection Accuracy#
We achieve 98.8% accuracy on unmodified Claude output. Claude's more varied and nuanced writing style means detection of heavily edited text is harder — our scores honestly reflect this with lower probability values rather than false certainty. Read our full accuracy analysis for more details on detection rates by model.
Use Both Detection Tools#
For comprehensive content verification, pair our Claude detector with the plagiarism checker to ensure text isn't copied from existing sources. If you're a teacher, check out our classroom AI detection guide for best practices on using AI detection in academic settings.