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Claude Haiku 4.5 Thinking is the Extended Thinking version of Claude Haiku 4.5, available through Starrise AI via OpenAI-compatible interface. Combining Haiku’s speed and cost advantages with step-by-step internal reasoning enabled by default, it significantly improves accuracy on complex tasks while remaining far faster and more affordable than large thinking models.

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
  • Fast and affordable — Thinking capability at Haiku-level speed and cost
  • Streaming — Real-time token streaming via SSE
  • Strong reasoning — Higher accuracy on math, logic, and multi-step problems

Quick Example

Parameters

API Reference

View the interactive API Playground for Claude Haiku 4.5 Thinking.