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Simon Willison: Claude Sonnet 5.5 (Sep. 28, 2026)
Anthropic released Claude Sonnet 5.5, claiming it is faster, cheaper to run, and stronger than Sonnet 5. It now powers Claude’s free tier, performs well on coding tasks. -
Anthropic: Introducing Claude Sonnet 5.5 (Sep. 28, 2026)
Claude Sonnet 5.5 is faster, more capable, and up to 30% cheaper per task than Sonnet 5. It excels at coding, everyday knowledge work, document creation, and design. -
Anthropic: Introducing Claude Opus 5.5 (Sep. 22, 2026)
Claude Opus 5.5 is Anthropic’s latest model, offering stronger coding, research, reasoning, and computer-use performance than Opus 5. -
Anthropic: The Situation Report (Sep. 19, 2026)
In the Democratic Republic of the Congo, health teams are using AI to speed Ebola reporting, analyze virus genomes, model disease spread, and support vaccine research. -
Anthropic: Introducing the Life Sciences Verification Program (Sep. 17, 2026)
Anthropic’s Life Sciences Verification Program gives vetted teams broader access to its AI models for biology, drug discovery, clinical development, and manufacturing. -
OpenAI: Our framework for reporting model misalignment (Sep. 8, 2026)
OpenAI introduced a framework for faster, more consistent reporting of model misalignment throughout training, testing, and deployment. -
OpenAI: Building standards for the next phase of AI (Sep. 16, 2026)
AI’s progress should benefit humanity, while automated AI research advances alignment, safety, and access. As recursive self-improvement could weaken human control, development should proceed cautiously.
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