
Boris Cherny Used Opus 5.5 to Formally Verify the Claude Agent SDK
Boris Cherny used Opus 5.5 with Lean 4 and TLA+ to formally verify the Claude Agent SDK — 16 PRs, 24 bugs found, 1,529 theorems, zero gaps.

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Founder & AI Product Leader
Yash Thakker is a Generative AI expert with over 12 years of experience in product leadership and technical strategy. As the founder of explainx.ai, he has taught over 300,000 learners and built AI platforms serving millions of users globally. He specializes in Agentic AI, Multimodal RAG, and the intersection of LLMs with consumer hardware.

Boris Cherny used Opus 5.5 with Lean 4 and TLA+ to formally verify the Claude Agent SDK — 16 PRs, 24 bugs found, 1,529 theorems, zero gaps.

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Opus 5.5 beats Fable 5.1 on every Anthropic benchmark at lower cost. So why does Reddit still say Fable wins? The numbers and the reaction.

Google Labs' "CC" coordinates family logistics with its own Google account and shared memory. What it does, and why the name confused people.

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