Anthropic Releases Claude Sonnet 4.6 with 1M Token Context Window and Improved Computer Use

Summary

Anthropic released Claude Sonnet 4.6 on February 17, 2026, making it the new default model for Free and Pro users on claude.ai and Claude Cowork. The model delivers significant capability improvements over Sonnet 4.5 across coding, computer use, long-context reasoning, agent planning, knowledge work, and design — all at the same pricing of $3/$15 per million tokens. The most technically notable upgrade is a 1 million token context window (currently in beta), sufficient to hold entire codebases,