--- description: Claude Haiku 5.5 is a fast, cost-efficient model for high-volume, latency-sensitive tasks such as classification, extraction, routing, and subagent work. title: Claude Haiku 5.5 image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/llms.txt > Use this file to discover all available pages before exploring further. ![Anthropic logo](https://developers.cloudflare.com/_astro/anthropic.DbRqBIjP.svg) # Claude Haiku 5.5 Text Generation • Anthropic Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/) Model ID `anthropic/claude-haiku-5.5` Copy Use with the [Workers AI binding](https://developers.cloudflare.com/ai-gateway/usage/worker-binding-methods/), the AI Gateway [REST API](https://developers.cloudflare.com/ai-gateway/usage/rest-api/), or the [Unified API](https://developers.cloudflare.com/ai-gateway/usage/chat-completion/). Calling the provider directly? Use the provider's model name instead, including with [provider-native endpoints](https://developers.cloudflare.com/ai-gateway/usage/providers/) or the provider's own SDK. For example, Anthropic's name for `anthropic/claude-opus-4.8` is `claude-opus-4-8`. - Third-party Claude Haiku 5.5 is a fast, cost-efficient model for high-volume, latency-sensitive tasks such as classification, extraction, routing, and subagent work. | Model Info | | | --- | --- | | Context Window [ ↗](https://developers.cloudflare.com/workers-ai/platform/glossary/) | 1,000,000 tokens | | Terms and License | [link ↗](https://www.anthropic.com/legal/commercial-terms) | | More information | [link ↗](https://platform.claude.com/docs/en/models/haiku-5-5/overview) | | Request formats | Anthropic Messages | | Pricing | | ## Usage ```ts const response = await env.AI.run( 'anthropic/claude-haiku-5.5', { max_tokens: 256, messages: [{ content: 'Classify this support ticket as billing, technical, or account: My invoice shows an unexpected charge.', role: 'user' }], }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/messages \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "anthropic/claude-haiku-5.5", "max_tokens": 256, "messages": [ { "content": "Classify this support ticket as billing, technical, or account: My invoice shows an unexpected charge.", "role": "user" } ] }' ``` ``` **Billing** The ticket is about an invoice showing an unexpected charge, which falls under billing. ``` ```json { "id": "msg_011CfoNwxiMXWCayWiWZRotX", "type": "message", "role": "assistant", "content": [ { "type": "text", "text": "**Billing**\n\nThe ticket is about an invoice showing an unexpected charge, which falls under billing." } ], "model": "claude-haiku-5-5", "stop_reason": "end_turn", "usage": { "input_tokens": 40, "output_tokens": 35 }, "container": null, "stop_sequence": null, "stop_details": null, "diagnostics": null } ``` ## Examples
**Structured Extraction** — Use adaptive thinking for structured extraction. ```ts const response = await env.AI.run( 'anthropic/claude-haiku-5.5', { max_tokens: 1024, messages: [{ content: 'Extract the order ID and requested action from: Please cancel order #A-1042 before it ships.', role: 'user' }], output_config: { effort: 'medium' }, thinking: { type: 'adaptive' }, }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/messages \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "anthropic/claude-haiku-5.5", "max_tokens": 1024, "messages": [ { "content": "Extract the order ID and requested action from: Please cancel order #A-1042 before it ships.", "role": "user" } ], "output_config": {"effort": "medium"}, "thinking": {"type": "adaptive"} }' ``` ``` **Order ID:** A-1042 **Requested action:** Cancel the order before it ships ``` ```json { "id": "msg_011CfoNx2fFMc8rnUuBBgE3A", "type": "message", "role": "assistant", "content": [ { "type": "text", "text": "**Order ID:** A-1042\n**Requested action:** Cancel the order before it ships" } ], "model": "claude-haiku-5-5", "stop_reason": "end_turn", "usage": { "input_tokens": 38, "output_tokens": 31 }, "container": null, "stop_sequence": null, "stop_details": null, "diagnostics": null } ```
**Streaming Response** — Stream a low-latency response incrementally. ```ts const response = await env.AI.run( 'anthropic/claude-haiku-5.5', { max_tokens: 512, messages: [{ content: 'Return a concise three-step deployment checklist.', role: 'user' }], stream: true, }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/messages \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "anthropic/claude-haiku-5.5", "max_tokens": 512, "messages": [{"content": "Return a concise three-step deployment checklist.", "role": "user"}], "stream": true }' ``` ``` **Three-Step Deployment Checklist** 1. **Pre-deployment** - Confirm all tests pass and code is reviewed and approved. - Verify configuration, environment variables, and secrets are set for the target environment. - Back up the current production state and prepare a rollback plan. 2. **Deploy** - Release to production using the approved pipeline or process, avoiding manual changes where possible. - Run database migrations or other required schema changes, if any. - Monitor the rollout in stages if supported (e.g., canary or gradual release). 3. **Post-deployment** - Run smoke tests on critical paths. - Check logs, error rates, and performance metrics against baseline. - Notify stakeholders of completion and keep the rollback plan ready for a defined monitoring window. ``` ```json [ { "type": "message_start", "message": { "model": "claude-haiku-5-5", "id": "msg_011CfoNx62eTigAN2u1rkUKg", "type": "message", "role": "assistant", "content": [], "container": null, "stop_reason": null, "stop_sequence": null, "stop_details": null, "usage": { "input_tokens": 23, "cache_creation_input_tokens": 0, "cache_read_input_tokens": 0, "cache_creation": { "ephemeral_5m_input_tokens": 0, "ephemeral_1h_input_tokens": 0 }, "output_tokens": 4, "service_tier": "standard", "inference_geo": "global" }, "diagnostics": null } }, { "type": "content_block_start", "index": 0, "content_block": { "type": "thinking", "thinking": "", "signature": "" } }, "... 75 more chunks omitted ...", { "type": "message_stop" } ] ```
## Parameters ▶messages\[] `array`required max\_tokens `number`requiredexclusiveMinimum: 0 ▶system `one of` stream `boolean` ▶metadata{} `object` id `string` type `string`const: message role `string`const: assistant ▶content\[] `array` model `string` stop\_reason `string` ▶usage{} `object` ## API Schemas (Raw) Input [Open](https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/schema-input.json) [Download](https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/schema-input.json) Output [Open](https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/schema-output.json) [Download](https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/schema-output.json) Was this helpful? YesNo ## On this page [![](https://developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/#page","headline":"Claude Haiku 5.5","description":"Claude Haiku 5.5 is a fast, cost-efficient model for high-volume, latency-sensitive tasks such as classification, extraction, routing, and subagent work.","url":"https://developers.cloudflare.com/ai/models/anthropic/claude-haiku-5.5/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} ```