Claude Authenticity

This is a self-contained Python script that runs nine weighted checks to detect whether an API endpoint actually serves genuine Claude or just wraps someone else's model. It mirrors the claude-verify project's methodology, looking for signature fields, extended thinking blocks, cache_creation tokens, and identity keywords that real Claude returns but wrappers typically strip or fake. The script also extracts injected system prompts if a provider is overriding Claude's identity. One sharp design choice: it defaults to Anthropic's native API format because OpenAI-compatible endpoints silently drop the telltale fields, causing false negatives. You get a score out of 100 and a verdict: genuine, suspected, or likely fake. Useful when auditing third-party Claude resellers or testing whether your API key points to the real thing.

Install to Claude Code

npx -y skills add agentscope-ai/openjudge --skill claude-authenticity --agent claude-code