Anthropic launched Claude 3.7 Sonnet, their most intelligent model to date featuring hybrid reasoning with two thinking modes: near-instant and extended step-by-step thinking. The release includes Claude Code, an agentic coding tool in limited preview, and supports a 128k output token capability in beta. Claude 3.7 Sonnet performs well on coding benchmarks like SWE-Bench Verified and Cognition's junior-dev eval, and introduces advanced features such as streaming thinking, prompt caching, and tool use.

The model is also benchmarked on Pokebench, reflecting agentic capabilities similar to the Voyager paper. The launch is accompanied by extensive documentation, cookbooks, and prompting guides for extended thinking. "The first generally available hybrid reasoning model" and "first coding tool from Anthropic" were highlighted in social media announcements.