Claude Sonnet 4.5

Anthropic's smart model for complex agents and coding.

Anthropic’s smarter, more agent-focused Sonnet release, designed for complex tool use, coding workflows, and orchestration-heavy agents. It improves reasoning and reliability over previous Sonnet versions, especially in multistep tasks and multi-tool pipelines. The model is well suited for production agents that must manage workflows, call APIs, and maintain context over many steps. It sits in a sweet spot between Haiku and Opus for both quality and cost.

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