# Anthropic open-sources FlashProve to verify which AI model produced a response



Anthropic



Anthropic has introduced and open-sourced FlashProve, a cryptographic approach that lets developers verify whether a response came from a specified AI model. Anthropic says it is more efficient than earlier open-source methods and describes potential uses in preventing chat hijacking and checking that safety evaluations test the model actually served to users. Developers who need inference-provenance checks can explore the official write-up and code. FlashProve is not a new model and does not establish that an answer is factually correct.

- Announcement time: Nov 03, 2026
- Review updated: Nov 04, 2026 12:52 Wed · Beijing Time (UTC+8)

## Sources

- Source excerpt: https://x.com/AnthropicAI/status/2117710942826123294

Canonical entry: https://www.ailyre.com/source/?id=anthropic-flashprove-open-source-2026-11-03&lang=en