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Claude Haiku 5.5 now available on AI Gateway

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Claude Haiku 5.5 from Anthropic is now available on AI Gateway.

It is built for high-volume, cost-sensitive tasks such as summaries, context compaction, database queries, and classification, and works as a subagent alongside larger Claude models on coding work. It is also the fastest Claude model at standard speed, which suits live customer support and browser use. Test it as a direct upgrade wherever you use Claude Haiku 4.5 today.

Haiku 5.5 is the first Haiku model with effort levels. It uses adaptive thinking and supports low, medium, high, xhigh, and max effort, which set how much the model thinks and how many tokens it uses. You can turn thinking off at low, medium, and high. At xhigh and max, thinking must stay on.

Haiku 5.5 supports Zero Data Retention on AI Gateway. It ships with biology and cybersecurity safeguards, so it may decline some requests in those areas.

Call it through the AI SDK, the Chat Completions, Responses, and Anthropic Messages APIs, or a coding agent connected to AI Gateway. Set effort with reasoning in the AI SDK or reasoning_effort in Chat Completions.

Use anthropic/claude-haiku-5.5 as the model name:

import { streamText } from 'ai';


const result = streamText({
  model: 'anthropic/claude-haiku-5.5',
  reasoning: 'low',
  prompt: 'Extract the city and date from: Meet me in Paris on May 3.',
});
View model details

To use it in Claude Code, Codex, Cursor, and more, install the latest Vercel CLI and run setup:

npm i -g vercel@latest
vercel ai-gateway setup

Then select anthropic/claude-haiku-5.5 in the agent. See the coding agents guide for details.

Try Claude Haiku 5.5 in the model playground.

AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in custom reporting, Zero Data Retention support, budgets for API keys, routing rules, and more.

AI Gateway reflects provider pricing with no markup and does not charge a platform fee on inference, including on Bring Your Own Key (BYOK) requests.

You can view all language models available on AI Gateway.