Anthropic develops open-source system FlashProve to verify AI model authenticity

Anthropic is developing an open-source system called FlashProve that uses verifiable inference to provide cryptographic proofs for model outputs, ensuring users can verify that responses originate from a specific model. The system requires AI labs to publish model fingerprints that do not expose weights, enabling lightweight local verification to prevent vendors from covertly swapping in cheaper models to cut costs or inflating benchmark results. Its technical specifications and code have been open-sourced on GitHub, though the project remains work-in-progress research and has not yet been deployed in production.