The Sequence Learning Loop: Opus 5.5, DeepSeek Environments, and Claude's DNA Discovery

Issue 942 of The Sequence links Anthropic's Claude Opus 5.5, reported for the week of September 21–27, to DeepSeek's September 19 environments paper and a report of AI-assisted biological discovery. The newsletter argues that progress increasingly depends on the surrounding machinery that governs where a model acts, what it observes, and how its conclusions are checked.