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Anthropic and Theorem Report Machine-Checked Proofs for 239 Fuzz-Test Entry Points

·2026.11.05 18:33

Key point

The report details the production of machine-checked proofs for 239 entry points across 123 libraries, identifying bugs that survived extensive fuzzing.

Details

  • Anthropic and Theorem produced machine-checked proofs for 239 fuzz-test entry points across 123 open-source libraries.
  • Claude identified bugs that had survived trillions of fuzzing runs while attempting to prove the code could not crash.
  • The generated proofs are limited to inputs within a specific size limit and rely on a particular machine model.
  • The validity of these guarantees for production systems depends on how closely the proof assumptions match the actual software environment.
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