Which AI models can you detect?

OriginalCheck detects content from GPT-4/3.5, Claude, Gemini, Llama, and most other major language models.

Is there a usage limit?

Free users get 3 AI detection checks per day. Pro users get unlimited.

We analyze perplexity (text predictability) and burstiness (sentence length variance) to determine if content was AI-generated.

Paste any text to detect if it was written by AI. Supports GPT, Claude, Gemini, and all major AI models.

Detects GPT-4, Claude, Gemini, Llama, and other AI models.

Uses perplexity and burstiness analysis for high accuracy.

No signup required — results in under 30 seconds.

Works with any type of written content.

Detect AI-generated content with industry-leading accuracy.