Key Capabilities
- OpenAI-compatible — Drop-in replacement for the OpenAI SDK, no other code changes needed
- Extended Thinking — Step-by-step internal reasoning enabled by default
- Best coding model — Top-performing for code generation, refactoring, and debugging
- Enhanced reasoning — Significantly improved accuracy on complex multi-step tasks
- Long context — Supports large document processing and multi-turn conversations
- Streaming — Real-time token streaming via SSE
Quick Example
Parameters
API Reference
View the interactive API Playground for Claude Sonnet 4.5 Thinking.

