Haseeb Qureshi ＞|＜(@hosseeb):Good timing for this blog post. We needed a win. Formal verification is a big part of why cyber is defense-dominant long term. It's not a panacea, but a formally verified program is way more robust than one that's vibe-tested. Frontier LLMs are now capable enough to generate substantial proof coverage over complex programs and they're becoming quite efficient. Plus these proofs build on each other. We're gonna make it y'all.

2026.10.23 01:06

Good timing for this blog post. We needed a win. Formal verification is a big part of why cyber is defense-dominant long term. It's not a panacea, but a formally verified program is way more robust than one that's vibe-tested. Frontier LLMs are now capable enough to generate substantial proof coverage over complex programs and they're becoming quite efficient. Plus these proofs build on each other. We're gonna make it y'all.

Anthropic@AnthropicAI

2026.10.22 22:01

New on our Frontier Red Team blog: using Claude to formally verify software at large scale. Formal verification can prove that code is free of certain bugs, but historically it has only been feasible for small codebases (or required a lot of expert time). With AI models, however, this is beginning to change. In collaboration with @theoremlabs, we used Claude to prove security properties in over one hundred real-world open-source libraries over the span of a few weeks. Read our research in full here: