# Anthropic's FlashProve proves which AI model answered you

> Anthropic releases an open-source tool that cryptographically proves an AI reply came from the model a provider claims to have used.
- Title: Anthropic's FlashProve proves which AI model answered you
- Summary: Anthropic releases an open-source tool that cryptographically proves an AI reply came from the model a provider claims to have used.
- Keywords: anthropic, flashprove, ai verification, cryptographic proof, model authentication, open source, The Next Web
- Source: The Next Web — https://thenextweb.com/news/anthropic-flashprove-provable-inference-ai-model-identity
- Author: Ana Maria Constantin
- Published: 2026-11-05T14:26:38+00:00
- Read time: 1 min
- Topics: anthropic, flashprove, ai verification, cryptographic proof, model authentication, open source, technology, startups
## The problem: you cannot verify which model answered
Today users cannot tell whether a router swapped in a cheaper model or an attacker tampered with replies. Anthropic's FlashProve tackles this with provable inference.
## How FlashProve works: cryptographic proof of model identity
The provider publishes a fingerprint of its model weights. Each reply comes with a cryptographic proof that those weights produced it. The proof reveals nothing about the weights themselves.
## Speed and scale: seventy to ninety five times slower
Anthropic tested FlashProve on Meta's Llama 4 Maverick, a four hundred billion parameter mixture of experts model.
## Real world uses and current limits
Anthropic sees uses for independent evaluators, customers of routing services, and regulators checking approved models.
## Key takeaway

Anthropic released FlashProve, an open-source prototype using cryptographic proofs to verify that AI replies came from the claimed model, not a cheaper substitute.