Claude Formalizes Fermat's Last Theorem in Lean

Claude Formalizes Fermat's Last Theorem in Lean

Anthropic published the first complete computer-checked proof of Fermat's Last Theorem on September 4, 2026. Claude wrote it largely on its own across 11 days, producing about 13 million lines of Lean.

OpenAI Begins Rolling Out GPT-6 Astra

OpenAI Begins Rolling Out GPT-6 Astra

OpenAI began rolling out GPT-6 Astra on September 3, its most capable model for computer use, browsing, and software engineering, with paid ChatGPT tiers and the API to follow in the coming days.

K2 Horizon: World's Largest Fully Open AI Models

K2 Horizon: World's Largest Fully Open AI Models

IFM released K2 Horizon on September 3: six fully open models from 0.9B to 375B, shipped with weights, code, and training data under Apache 2.0. Here is how to download and run them.

Character.AI Comics Turns Chats Into Comic Books

Character.AI Comics Turns Chats Into Comic Books

Character.AI launched (c.ai) Comics on September 2, a premium feature that turns AI character chats into fully illustrated, multi-page comic books with consistent character art.

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