Claude Haiku 5.5

Anthropic's fastest and cheapest small model.

Knowledge cutoff Jun 2026. Adaptive thinking is on by default and can be turned off; effort is low, medium or high. Standard pricing applies to prompts up to 100K tokens and rises fivefold above that. Cached input $0.01/M.

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{
  "model": "claude-haiku-5-5",
  "messages": [
    {
      "role": "user",
      "content": "Hello, world."
    }
  ]
}