SONNET

Use opus, sonnet, haiku, and best to switch models easily.

Hybrid mode: Opus for planning, Sonnet for execution.

Extended context window for Opus and Sonnet on supported plans.

Anthropic's Sonnet 4.6 narrows the gap to Opus on agentic tasks, leads computer use benchmarks, and ships with a beta million-token context window. Here's what actually changed.

Anthropic's Claude Sonnet 4.5 isn't just another model increment. The company claims they've observed it maintaining focus for more than 30 hours on complex multi-step tasks.