AI in September 2026: The Month in One Page
GPT-6, four Claude releases, Gemini 3.8 Flash, a second OpenAI sandbox escape, a superintelligence ban bill and a lawsuit from British Columbia. Everything that mattered in AI this month, with sources.
Anthropic
Every Hermes Vector story about Anthropic, newest first. Each one is checked against its sources.
More stories
Anthropic's September: Fable 5.1, Mythos 5.1, Opus 5.5 and Sonnet 5.5
Anthropic released four models in four weeks. Opus 5.5 roughly matches Fable 5.1 at lower cost, and Sonnet 5.5, released September 28, comes close to Opus 5.5 for $2/$10 per million tokens.
Checked against 1 sourceAnthropic
AI Policy Heats Up: The 'Pacing the Frontier' Letter and the Ban Artificial Superintelligence Act
AI lab employees asked Washington for tools to pace AI development. Two months later, Sen. Bernie Sanders and Rep. Greg Casar proposed banning superintelligence outright.
Checked against 6 sourcesPacing the FrontierThe Next WebRep. Casar+3 more
Advertisement