Claude Sonnet 4

Claude Sonnet 4 is Anthropic's versatile AI model that perfectly balances high performance with accessibility. It's an intelligent assistant for everyday tasks that surpasses predecessors in coding, data analysis, and instruction following.

The key innovation is hybrid architecture offering two modes: near-instant responses and extended thinking for deep reasoning. The model supports a 200K token context window and can generate up to 64K tokens in a single response.

Technically, the model shows impressive improvements: substantial improvements in large-scale codebase navigation—typically reducing errors from 20% to near zero. The model can use tools in parallel, follow instructions more precisely, and demonstrate significantly improved memory capabilities.

Sonnet 4 is a generalist model that's great for most AI use cases and especially strong at coding. It's also available to free users, making it unusually accessible for a model of this quality. It offers superior instruction following, tool selection, error correction, and advanced reasoning for customer-facing agents and complex AI workflows, making it a powerful choice for agentic coding.

Perfect for building chatbots, document analysis, code generation, and business process automation with enterprise-grade reliability.