Claude Haiku 5.5 (claude-haiku-5-5) is now available as a text/reasoning model.
Claude Haiku 5.5
- Anthropic's fastest, lowest-cost model, with a 1M-token context window. The model supports up to 128K output tokens; authoring is capped at 64K for now.
- Pass
claude-haiku-5-5as the model id from the MCP server or the Creative API. Claude Haiku 4.5 stays available, and your defaults don't change. - Priced at $0.10 / 1M input tokens and $0.50 / 1M output tokens, with cached input at $0.01 / 1M tokens, for prompts up to 100K tokens.
- A single request with more than 100K input tokens is billed at 5x every rate for the whole request.