Anthropic has released Claude Sonnet 4.5, an update of the company's coding model that features extended autonomous operation, greater context awareness, and enhanced tool usage. Claude Sonnet 4.5 shows significant improvements on real-world computer tasks, agentic coding, agentic terminal coding, and agentic tools use, as well as reasoning and math, according to Anthropic. Claude Sonnet 4.5 can be accessed by developers using claude-sonnet-4-5 via the Claude API.
On Monday, Anthropic released Claude Sonnet 4.5, a new AI language model the company calls its "most capable model to date," with improved coding and computer use capabilities. The company also revealed Claude Code 2.0, a command-line AI agent for developers, and the Claude Agent SDK, which is a tool developers can use to build their own AI coding agents.