# Language Models Make Formal Verification Cheap

Language models keep lowering the cost of machine-checked proofs, so formal guarantees spread from small, hand-verified kernels into ordinary production libraries and become a recurring security and procurement standard.

- Conviction: 40 / 100 (forming)
- Horizon: Emerging (watchlist)
- Tracking since: 2026-10-25T00:00:00.000Z
- Last updated: 2026-10-25T06:47:13.217Z
- Canonical: https://polylog.news/ai/trends/llm-formal-verification-at-scale
- Publisher: Polylog

## Recent evidence

- [confirms] Claude produced assembly-level crash-freedom proofs for 239 entry points across 123 OSS-Fuzz libraries (2026-10-25): Anthropic and the startup Theorem had Claude produce assembly-level crash-freedom proofs for 239 entry points across 123 OSS-Fuzz libraries, about 180 million lines of Rocq. Turning existing fuzz harnesses into formal specs extends machine-checked guarantees to ordinary libraries. Coverage is still limited to single-threaded static RISC-V binaries.