Canonical AI event

Claude 2.9.1 adds visible thoughts to adaptive thinking tasks.

The 2026-09-15 v2.9.1 release allows users to see Claude's reasoning steps during adaptive thinking tasks.

15 Sept 20261 verified claims1 sources1 observations

What happened

The official source reports this update: v2.9.1. 2.9.1 (2026-09-15) Highlights This release focuses on improving visibility into model reasoning steps when utilizing Claude's adaptive thinking capabilities. Claude Integration : Access the step-by-step reasoning process of Claude models by ensuring visible thoughts are requested during adaptive thinking tasks. ( ba0d542 ) Bug Fixes request visible thoughts for Claude adaptive thinking ( ba0d542 )

Why it matters

This official update documents a development concerning v2.9.1. Its practical significance depends on the scope and evidence stated by the source.

What to watch next

Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge