Claude Sonnet 4.6 released with upgrades and 1M token context window

Anthropic's Claude Sonnet 4.6 is announced as its most capable Sonnet model, with full upgrades across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. It also features a 1M token context window in beta.

The author notes that the model is versatile across classification, coding, computer use, and autonomous agents by adjusting effort and thinking modes.