Claude Haiku 5.5 now available on AI Gateway

Anthropic's Claude Haiku 5.5 is now available on Vercel's AI Gateway under the model name anthropic/claude-haiku-5.5, positioned as a direct upgrade to Claude Haiku 4.5 for high-volume, cost-sensitive tasks such as summaries, context compaction, database queries, and classification. Haiku 5.5 is the first Haiku model with effort levels, supporting low, medium, high, xhigh, and max settings that control how much the model thinks and how many tokens it uses, with thinking optional at low, medium, and high but required at xhigh and max. The model supports Zero Data Retention on AI Gateway, ships with biology and cybersecurity safeguards, and is callable through the AI SDK, Chat Completions, Responses, and Anthropic Messages APIs or a connected coding agent.

Claude Haiku 5.5 https://vercel.com/ai-gateway/models/claude-haiku-5.5 from Anthropic https://vercel.com/ai-gateway/models/providers/anthropic is now available on AI Gateway https://vercel.com/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 https://vercel.com/ai-gateway/models/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 https://vercel.com/docs/ai-gateway/security-and-compliance/zdr 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 https://vercel.com/docs/ai-gateway/sdks-and-apis/ai-sdk , the Chat Completions https://vercel.com/docs/ai-gateway/sdks-and-apis/openai-chat-completions , Responses https://vercel.com/docs/ai-gateway/sdks-and-apis/responses , and Anthropic Messages https://vercel.com/docs/ai-gateway/sdks-and-apis/anthropic-messages-api APIs, or a coding agent https://vercel.com/docs/ai-gateway/coding-agents 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: Then select anthropic/claude-haiku-5.5 in the agent. See the coding agents guide https://vercel.com/docs/ai-gateway/coding-agents for details. Try Claude Haiku 5.5 in the model playground https://vercel.com/ai-gateway/models/claude-haiku-5.5 . 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 https://vercel.com/changelog/custom-reporting-ai-gateway , Zero Data Retention support https://vercel.com/blog/zdr-on-ai-gateway , budgets for API keys https://vercel.com/docs/ai-gateway/authentication-and-byok/api-keys , routing rules https://vercel.com/docs/ai-gateway/models-and-providers/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 https://vercel.com/docs/ai-gateway/authentication-and-byok/byok BYOK requests. You can view all language models https://vercel.com/ai-gateway/models?type=text available on AI Gateway.