On September 1, 2026, Anthropic released Claude Fable 5.1 alongside a second model, Claude Mythos 5.1, positioning both as the top of the Claude lineup for the hardest reasoning and the longest, most autonomous agentic work the company builds for. Two days later, OpenAI answered with GPT-6 Astra at an identical headline price. That timing…
The biggest AI developments this week and what they mean for you. THE BIG STORY OpenAI launched GPT-6 Astra on September 3, and the headline out of the launch briefing was president Greg Brockman closing the session with “welcome to the AGI era.” That is a bold framing for a company to put behind a…
Two frontier models launched within 48 hours of each other in early September 2026. OpenAI shipped GPT-6 Astra on September 3, with president Greg Brockman declaring “welcome to the AGI era” in the launch briefing. Anthropic shipped Claude Fable 5.1 on September 1, positioning it as its most capable model to date. Both list at…
