AI model · by Anthropic
Claude Haiku 5.5
Claude Haiku 5.5 is Anthropic's quickest and most economical model in the Claude 5.5 line, designed for responsive uses such as chat and voice agents.
- Released 7 Oct 2026
- 1M tokens context
- Closed weights
- Checked against Anthropic's page 19 Oct 2026
What Claude Haiku 5.5 is for
Anthropic says Claude Haiku 5.5 is meant for time-sensitive work like chat, voice agents, live support, and in-app assistants, and for high-volume jobs such as classification, summarization, and text generation. It can also act as a quick, low-cost helper model for coding and clearly defined tasks, and it is the first Haiku to offer effort controls, letting teams weigh cost against intelligence. Users on Claude.ai can pick it on the Free, Pro, Max, Team, or Enterprise plans, and it is offered on the Claude Platform, Amazon Web Services, Google Cloud, Microsoft Foundry, and Claude Code.
What Anthropic says it does well
- Fast enough for real-time experiences such as chat, voice agents, live support, and in-app assistants
- Suited to high-volume text tasks like classification, summarization, and text generation
- Works as a fast, cost-efficient subagent for coding and well-defined tasks
- Strong computer use agent for repetitive tasks like form filling and data entry
- Handles focused coding and multi-step tool use, such as direct edits and small changes across many files
- First Haiku with effort controls, to tune cost against intelligence for each task
Where to use it
- Claude.ai for Free, Pro, Max, Team, and Enterprise users, on web, iOS, and Android
- Amazon Web Services, Google Cloud, and Microsoft Foundry
- Claude Code