Claude Haiku 5.5 now available on AI Gateway
Quick Answer
Claude Haiku 5.5, now available on AI Gateway, is optimized for cost-sensitive tasks and offers adaptive effort levels.
Quick Take
It is the fastest Claude model, ideal for live support, and includes Zero Data Retention with built-in safeguards for biology and cybersecurity.
Key Points
- Supports low to max effort levels for adaptive thinking and token usage.
- Fastest Claude model, ideal for live customer support and browser use.
- Includes Zero Data Retention and safeguards for biology and cybersecurity.
- Accessible via AI SDK, Chat Completions, and Anthropic Messages APIs.
- No markup on provider pricing and no platform fees for inference.
📖 Reader Mode
~2 min readClaude 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:
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.
— Originally published at vercel.com
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