February 17, 2026 · Anthropic

Claude Sonnet 4.6 launched; API code execution free with web search and fetch

We’ve launched Claude Sonnet 4.6, our latest balanced model combining speed and intelligence for everyday tasks. Sonnet 4.6 delivers improved agentic search performance while consuming fewer tokens. Sonnet 4.6 supports extended thinking and a 1M token context window (beta). See Models & Pricing for details.
API code execution is now free when used with web search or web fetch. Sandboxed code execution improves model capability and token efficiency. See the pricing details for standalone usage.
The web search tool and programmatic tool calling are available with no beta header required. Web search and web fetch now support dynamic filtering, which uses code execution to filter results before they reach the context window for better performance and reduced token cost.
The code execution tool, web fetch tool, tool search tool, tool use examples, and memory tool no longer require a beta header.