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Claude Sonnet 4

Claude 4 family workhorse; superior coding and reasoning over 3.7; hybrid reasoning with tool use support.

Claude Sonnet 4 released May 22 2025 represented a significant upgrade from Claude 3.7 Sonnet with superior coding and reasoning capabilities. It maintained hybrid reasoning modes supporting both near-instant responses and extended thinking with tool use. The model excelled at code reviews bug fixes customer support agents and AI assistants requiring reliable performance at scale. It demonstrated improved performance on ambiguous questions with low bias and high accuracy across social contexts. Available across Anthropic API Amazon Bedrock and Google Vertex AI at $3/$15 per million tokens. The Claude 4 release marked Anthropic's inaugural developer conference and introduced new API features including code execution tools MCP connectors and Files API. Sonnet 4 became the default model for most users including free tier delivering strong performance across conversation summarization and document tasks.

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