# Anthropic releases FlashProve code to verify which model produced a response

_Published Tuesday, November 3, 2026 at 4:09 PM EST · AI · Latest · Tier 2 — Notable_

![Anthropic releases FlashProve code to verify which model produced a response — Primary](https://jf.x.com/images/post/2117710942826123294.png)

Anthropic says it is open-sourcing FlashProve, a cryptographic system that lets developers verify whether a response came from a particular AI model. The company says it is substantially more efficient than prior open-source methods.

Potential uses include checking that a model undergoing safety evaluation is the same one served to customers and making chat hijacking harder. Anthropic describes these as applications of the proofs.

## Sources

- [Anthropic (@AnthropicAI)](https://x.com/AnthropicAI/status/2117710942826123294)

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Canonical: https://techandbusiness.org/newswire/txT9tOPan2DzQQwWwUA9dU
Published: 2026-11-03T21:09:03.270Z
Story chronology: 2026-11-03T20:10:08.000Z
Retrieved: 2026-11-04T00:33:03.846Z
Publisher: Tech & Business (techandbusiness.org)