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Updated: October 10, 2026 Claude Haiku 5.5 is Anthropic’s new Haiku model for frequent requests that need quick responses. Use it for classification, extraction, summaries, customer support, and focused subagent tasks within coding workflows. Anthropic recommends Sonnet 5.5 or Opus 5.5 for complex, long-running agentic coding. BetterToken now offers the Model ID claude-haiku-5-5. Check the model plaza for current availability and pricing.

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Highlights

  • Frequent tasks: handle repeated requests, document summaries, and narrowly scoped supporting work.
  • Adaptive thinking: enabled by default; adjust thinking depth with effort. The default level is medium.
  • Long context and vision: Anthropic lists a 1M-token context window, up to 128K output tokens, and text and image input with text output.

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Before switching from Haiku 4.5

For direct Messages API calls, review the official migration guide. Replace the old budget_tokens configuration with adaptive thinking, omit temperature, top_p, and top_k, and remeasure token usage and max_tokens limits. The new tokenizer and thinking behavior affect existing token budgets.

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Connect it

  1. Create a BetterToken API Key or use an existing key.
  2. In Claude Code or an Anthropic-protocol client, set the Base URL to https://bettertoken.ai.
  3. Set the Model ID to claude-haiku-5-5, without a date suffix.
  4. Test quality, latency, and token usage on a representative task before switching an existing workflow.
Use the Claude Code setup guide for client configuration or the model selection guide to compare options.

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Official sources