Anthropic ships Claude Sonnet 5 with a native 1M-token context
Published: 6/30/2026 · Source: Anthropic ↗
Released on June 30, 2026, Claude Sonnet 5 is Anthropic's workhorse frontier model: 63.2% on SWE-Bench Pro, a native one-million-token context window and strong tool-use reliability at Sonnet pricing.
It became the default model for Claude's free and Pro users, bringing frontier-grade agentic coding to the mainstream.