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Claude Opus 4.1 Thinking is the Extended Thinking version of Claude Opus 4.1, available through Starrise AI via OpenAI-compatible interface. Combining Opus’s unparalleled intelligence with step-by-step internal reasoning enabled by default, it delivers the highest accuracy on the most demanding tasks — including advanced mathematics, scientific research, and complex architectural decisions.

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
  • Maximum intelligence — The most powerful reasoning model available
  • Deep analysis — Expert at advanced mathematics, science, and complex problem solving
  • 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 Opus 4.1 Thinking.