A man threw a firebomb at OpenAI CEO Sam Altman's San Francisco home in the middle of the night. The suspect was a member of the PauseAI Discord server and had posted online about AI driving humanity to extinction.

US start-up Arcee AI spent roughly half its total venture capital to train Trinity-Large-Thinking, an open reasoning model with 400 billion parameters designed to take on Claude Opus in agent tasks.

AI agents are supposed to tap into specialized knowledge through so-called skills, modular instructions they can pull up on the fly. But a study testing 34,000 real-world skills finds these enhancements barely help under realistic conditions. Weaker models actually perform worse with them than without.

An international research team wants to bring order to the fragmented world model research landscape with OpenWorldLib. Text-to-video models like Sora are explicitly left out of their definition.

OpenAI recently added a $100 plan to its lineup, but confusing labels on the pricing page left users guessing about actual usage limits. An OpenAI employee tried to clear things up.