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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.

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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

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Quick Example

curl https://ai.alad.com/v1/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-haiku-4-5-20251001-thinking",
    "messages": [
      { "role": "user", "content": "Solve step by step: A train travels 120 km in 2 hours, then slows down and travels 80 km in 3 hours. What is the average speed for the entire journey?" }
    ]
  }'

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Parameters

ParameterTypeRequiredDescription
modelstringYesFixed value: claude-haiku-4-5-20251001-thinking
messagesarrayYesArray of { role, content } objects
max_tokensintegerNoMaximum number of tokens to generate
temperaturefloatNo0–2, controls randomness, default 1
streambooleanNoEnable SSE streaming, default false
top_pfloatNoNucleus sampling threshold, default 1
stopstring / arrayNoSequences where generation stops

API Reference

View the interactive API Playground for Claude Haiku 4.5 Thinking.