Claude 4.6 Review: Adaptive Thinking, 1M Context, and Opus-Class Coding at Sonnet Price

Claude 4.6 — Opus 4.6 (February 4, 2026) and Sonnet 4.6 (February 17, 2026) — replaces binary Extended Thinking with Adaptive Thinking, extends context to 1M tokens at flat pricing, and pushes computer use to 72.5% on OSWorld. Sonnet 4.6 users preferred it to Opus 4.5 (the prior flagship) 59% of the time — Opus-class coding at roughly one-fifth the price.