
Claude Wrote the First Machine-Checked Proof of Fermat's Last Theorem
Claude formalized Fermat's Last Theorem in Lean 4: 13M+ lines, the largest Lean proof ever written. What it actually proves, and why it matters.

Expert profile
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.

Claude formalized Fermat's Last Theorem in Lean 4: 13M+ lines, the largest Lean proof ever written. What it actually proves, and why it matters.

A viral thread argues most enterprise AI spend fails because companies automate broken processes instead of redesigning them. explainx.ai on the argument, the 1990 precedent it's drawing on, and what builders should take.

Artificial Analysis shipped Index v4.2 on September 4, 2026 — new held-out evals, GPQA Diamond dropped, 40% private-test weighting. Fable 5.1 leads, Astra wins on cost and tokens.

California AG Rob Bonta is reportedly investigating OpenAI over the July Hugging Face breach, per Politico — joining 15+ states already probing under Alabama's lead. What the investigation covers and why it matters.

A viral r/ClaudeCode thread shows how to cut Claude Code's system-tool overhead from ~19k to ~9.8k tokens by disabling Artifact, /chrome, and Claude.ai connectors you're not using.

EEBench simulates AI-designed circuits in SPICE with real component tolerances. Claude Opus 5 tops the leaderboard at 61.6% — full results and what "build succeeds, circuit fails" really means.

Extropic's Z1T models claim 140x GPU energy efficiency on its Z1 thermodynamic chip. Here's what "sparse probabilistic hardware" means and what the numbers actually measure.

Figure is committing $3.5B initially, scaling past $6B, for up to 100,000 NVIDIA Vera Rubin GPUs with Nscale — deploying in Barstow, Texas from H2 2027. What the deal actually buys, and why a robotics company needs it.

GitHub's HydraFusion research preview orchestrates multiple models to draft, critique, and escalate coding tasks — Nadella claims 67% lower cost. Here is how the plan-build-critique pipeline actually works.

Google DeepMind ran 100 LLM agents as a research collective — one found an eval exploit, it spread, and other agents spontaneously organized to audit, report, and sanction the cheaters. Here's what the paper actually shows.

Google's Lyria 3.5 launched September 4, 2026 in the Gemini app, Gemini API, and AI Studio — up to 3-minute tracks, better vocals, lyric adherence, and accent handling. Here's what builders actually get access to.

OpenAI Codex's Eric Provencher says GPT-6 Astra needs shorter skills, leaner AGENTS.md files, and explicit completion criteria. Here's how to audit yours.