Claude Sonnet 4

Anthropic's mid-tier model: balances state-of-the-art coding (72.7% on SWE-bench) with cost-efficiency for high-volume, agentic workflows.

Claude Sonnet 4, released May 22, 2025, is Anthropic's versatile, mid-tier model (successor to Sonnet 3.7). It delivers superior coding performance, achieving a state-of-the-art 72.7% on SWE-bench. The model features hybrid reasoning: it offers both near-instant responses and an 'extended thinking' mode for deeper analysis. Optimized for high-volume applications, Sonnet 4 provides an optimal balance of capability and practicality, with pricing set at $3/$15 per million tokens (input/output). Access is readily available via the Anthropic API, Amazon Bedrock, and Google Cloud's Vertex AI.

https://www.anthropic.com/claude