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Anthropic Unveils Cryptographic Tool to Verify Model Outputs

Researchers released open-source code and a technical spec for FlashProve, which could let users verify model provenance on a local device.

  • On Tuesday, Anthropic announced FlashProve, an open-source system designed to provide "provable inference"—a cryptographic guarantee that a specific model produced a given output.
  • To function, FlashProve requires AI labs to publish a model "fingerprint" that can be matched to outputs and verified cryptographically, without revealing proprietary model weights.
  • Operating similarly to cryptographic email signatures, the system prevents companies from secretly swapping models to cut costs or inflate performance results through impostor claims.
  • Researchers released detailed technical specifications and working code on GitHub, explicitly inviting the community to examine, take, and improve the system's various elements.
  • While this intermediate research is ongoing, Anthropic has no immediate plans to deploy the system, focusing instead on gathering community feedback and further development.
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The open source project is designed to check whether a response actually comes from the specified model. Model weights remain secret.

Anthropic is working on an experimental FlashProve system. It determines which artificial intelligence model gave the user a particular result.

·Kyiv, Ukraine
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BITRSS broke the news on Tuesday, November 3, 2026.
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