We’re opening a research preview of Claude Duet, a new app where Claude works as a proactive agent. It comes to you with what needs your attention, completes tasks you ask of it, keeps working when you step away, and checks with you before it acts on your behalf.

JUST IN: Anthropic recorded a staggering $80,000,000,000.00 net loss in the first half of 2026.

Keep sensitive conversations out of view with Locked Chats in ChatGPT. Move chats out of your regular history and search into a protected space you can unlock with a PIN on web and desktop, or a PIN, Face ID, Touch ID, or device unlock on supported mobile devices. New messages sent in locked chats won't update the memory used in your regular chats. Rolling out starting today to Free, Go, Plus, Pro, Business, Enterprise, and Edu plans.

We’re sharing a solution to the Navier-Stokes Millennium Prize Problem, one of the deepest problems at the frontier of mathematics. The proof was produced by a group of agents, using an OpenAI next-generation model significantly more capable than GPT-6 Astra. The problem concerns whether the description of smooth three-dimensional fluid motion modeled by the Navier-Stokes equations can break down. It has remained unresolved for roughly 90 years.

Day 15/ We're cooked