Claude Sonnet 5 (Free)

Claude Sonnet 5 is positioned as the most agentic model in its family, designed to plan, use tools, and continue through complex, multi-step assignments involving code and documents. Its reported launch benchmarks show strong results across software engineering, terminal-oriented work, and computer use, indicating a broad focus on workflows that require sustained execution rather than isolated answers.

The model is a strong general-purpose option for everyday coding, debugging, test writing, refactoring, code review, knowledge work, and tool-assisted automation. Its reported SWE-bench Pro result improves on the prior Sonnet generation, while its Terminal-Bench and OSWorld scores support its suitability for developers building coding agents, computer-use systems, and other multi-step applications. It is a practical choice when strong capability matters more than the additional capability level associated with Opus-class models.