Claude Sonnet 4

Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.7, reaching a state-of-the-art 72.7% on SWE-bench with stronger coding and reasoning. It balances capability with efficiency and responds more precisely to instructions for greater control over implementation. Sonnet 4 supports extended thinking with integrated tool use and parallel tool execution, enabling capable agentic workflows. It pairs vision with text analysis and shows substantial gains in multi-file development, with fewer navigation errors across a codebase. With a 200K token context window and support for tools, vision, and PDF processing, Sonnet 4 produces clean code with precise, surgical edits. It suits everyday applications that want near-frontier performance at practical efficiency.