AI_SLANG_ENTRY
What Is Claude Haiku 5.5?
Claude Haiku 5.5 is an Anthropic model aimed at fast, high-volume work where response time and cost matter.
What does Claude Haiku 5.5 mean?
Claude Haiku 5.5 is an Anthropic model aimed at fast, high-volume work where response time and cost matter.
Haiku 5.5 is a Claude model for work that needs quick answers at scale. Choosing it still requires checking quality on your own tasks.
Origin and usage
Haiku 5.5 is a versioned name in Anthropic's Claude model lineup. It identifies a model, not a subscription plan or a separate assistant app.
Source type: product-term. Last checked: 2026-10-09.
Verified against Anthropic's announcement. Performance descriptions are vendor claims, not results from our own evaluation. Pricing and access may change.
What Anthropic designed it for
Anthropic lists summarization, classification, database queries, and coding subagent work among its uses. The model identifier is claude-haiku-5-5.
What adjustable effort means
Anthropic describes an adjustable effort setting that trades cost against capability. A higher setting is not a guarantee that a particular answer is correct.
A model is one part of an agent
A model generates responses; the surrounding application supplies tools, permissions, and the execution loop. A model name alone does not tell you whether an assistant can access files or take actions.
Examples
- We evaluated Haiku 5.5 for classifying incoming requests before choosing a model.
- The coding agent delegated a small, well-defined task to Haiku 5.5.
FAQ
What is the API model ID?
Anthropic lists claude-haiku-5-5.
Is Haiku 5.5 a Claude subscription?
No. It is a model name. Subscription eligibility and API billing are separate product details.
Does fast mean best for every task?
No. Compare accuracy, latency, and total cost on representative tasks before selecting a model.