Cloudflare Workers AI - Complete Reference

Cloudflare Workers AI - Complete Reference

Production-ready knowledge domain for building AI-powered applications with Cloudflare Workers AI.

Status: Production Ready ✅ Last Updated: 2025-11-21 Dependencies: cloudflare-worker-base (for Worker setup) Latest Versions: wrangler@4.43.0, @cloudflare/workers-types@4.20251014.0

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Table of Contents

1. Quick Start (5 minutes)
2. Workers AI API Reference
3. Model Selection Guide
4. Common Patterns
5. AI Gateway Integration
6. Rate Limits & Pricing
7. Production Checklist

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Quick Start (5 minutes)

1. Add AI Binding

wrangler.jsonc:

{
  "ai": {
    "binding": "AI"
  }
}

2. Run Your First Model

export interface Env {
  AI: Ai;
}

export default {
  async fetch(request: Request, env: Env): Promise<Response> {
    const response = await env.AI.run('@cf/meta/llama-3.1-8b-instruct', {
      prompt: 'What is Cloudflare?',
    });

    return Response.json(response);
  },
};

3. Add Streaming (Recommended)

const stream = await env.AI.run('@cf/meta/llama-3.1-8b-instruct', {
  messages: [{ role: 'user', content: 'Tell me a story' }],
  stream: true, // Always use streaming for text generation!
});

return new Response(stream, {
  headers: { 'content-type': 'text/event-stream' },
});

Why streaming?

• Prevents buffering large responses in memory
• Faster time-to-first-token
• Better user experience for long-form content
• Avoids Worker timeout issues

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Workers AI API Reference

Core API: env.AI.run()

const response = await env.AI.run(model, inputs, options?);

Parameter	Type	Description
model	string	Model ID (e.g., @cf/meta/llama-3.1-8b-instruct)
inputs	object	Model-specific inputs (see model type below)
options.gateway.id	string	AI Gateway ID for caching/logging
options.gateway.skipCache	boolean	Skip AI Gateway cache

Returns: Promise<ModelOutput> (non-streaming) or ReadableStream (streaming)

Input Types by Model Category

Category	Key Inputs	Output
Text Generation	messages[], stream, max_tokens, temperature	{ response: string }
Embeddings	text: string | string[]	{ data: number[][], shape: number[] }
Image Generation	prompt, num_steps, guidance	Binary PNG
Vision	messages[].content[].image_url	{ response: string }

📄 Full model details: Load references/models-catalog.md for complete model list, parameters, and rate limits.

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Model Selection Guide

Text Generation (LLMs)

Model	Best For	Rate Limit	Size
@cf/meta/llama-3.1-8b-instruct	General purpose, fast	300/min	8B
@cf/meta/llama-3.2-1b-instruct	Ultra-fast, simple tasks	300/min	1B
@cf/qwen/qwen1.5-14b-chat-awq	High quality, complex reasoning	150/min	14B
@cf/deepseek-ai/deepseek-r1-distill-qwen-32b	Coding, technical content	300/min	32B
@hf/thebloke/mistral-7b-instruct-v0.1-awq	Fast, efficient	400/min	7B

Text Embeddings

Model	Dimensions	Best For	Rate Limit
@cf/baai/bge-base-en-v1.5	768	General purpose RAG	3000/min
@cf/baai/bge-large-en-v1.5	1024	High accuracy search	1500/min
@cf/baai/bge-small-en-v1.5	384	Fast, low storage	3000/min

Image Generation

Model	Best For	Rate Limit	Speed
@cf/black-forest-labs/flux-1-schnell	High quality, photorealistic	720/min	Fast
@cf/stabilityai/stable-diffusion-xl-base-1.0	General purpose	720/min	Medium
@cf/lykon/dreamshaper-8-lcm	Artistic, stylized	720/min	Fast

Vision Models

Model	Best For	Rate Limit
@cf/meta/llama-3.2-11b-vision-instruct	Image understanding	720/min
@cf/unum/uform-gen2-qwen-500m	Fast image captioning	720/min

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Common Patterns

Pattern 1: Chat with Streaming

app.post('/chat', async (c) => {
  const { messages } = await c.req.json<{ messages: Array<{ role: string; content: string }> }>();
  const stream = await c.env.AI.run('@cf/meta/llama-3.1-8b-instruct', { messages, stream: true });
  return new Response(stream, { headers: { 'content-type': 'text/event-stream' } });
});

Pattern 2: RAG (Retrieval Augmented Generation)

// 1. Generate embedding for query
const embeddings = await env.AI.run('@cf/baai/bge-base-en-v1.5', { text: [userQuery] });
// 2. Search Vectorize
const matches = await env.VECTORIZE.query(embeddings.data[0], { topK: 3 });
// 3. Build context
const context = matches.matches.map((m) => m.metadata.text).join('\n\n');
// 4. Generate with context
const stream = await env.AI.run('@cf/meta/llama-3.1-8b-instruct', {
  messages: [
    { role: 'system', content: `Answer using this context:\n${context}` },
    { role: 'user', content: userQuery },
  ],
  stream: true,
});
return new Response(stream, { headers: { 'content-type': 'text/event-stream' } });

📄 More patterns: Load references/best-practices.md for structured output, image generation, multi-model consensus, and production patterns.

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AI Gateway Integration

Enable caching, logging, and cost tracking with AI Gateway:

const response = await env.AI.run('@cf/meta/llama-3.1-8b-instruct', { prompt: 'Hello' }, {
  gateway: { id: 'my-gateway', skipCache: false },
});

Benefits: Cost tracking, response caching (50-90% savings on repeated queries), request logging, rate limiting, analytics.

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Rate Limits & Pricing

Information last verified: 2025-01-14

Rate limits and pricing vary significantly by model. Always check the official documentation for the most current information:

• Rate Limits: https://developers.cloudflare.com/workers-ai/platform/limits/
• Pricing: https://developers.cloudflare.com/workers-ai/platform/pricing/

Free Tier: 10,000 neurons/day Paid Tier: $0.011 per 1,000 neurons

📄 Per-model details: See references/models-catalog.md for specific rate limits and pricing for each model.

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Production Checklist

Essential before deploying:

• Enable AI Gateway for cost tracking
• Implement streaming for text generation
• Add rate limit retry with exponential backoff
• Validate input length (prevent token limit errors)
• Add input sanitization (prevent prompt injection)

📄 Full checklist: Load references/best-practices.md for complete production checklist, error handling patterns, monitoring, and cost optimization.

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External SDK Integrations

Workers AI supports OpenAI SDK compatibility and Vercel AI SDK:

// OpenAI SDK - use same patterns with Workers AI models
const openai = new OpenAI({
  apiKey: env.CLOUDFLARE_API_KEY,
  baseURL: `https://api.cloudflare.com/client/v4/accounts/${env.CLOUDFLARE_ACCOUNT_ID}/ai/v1`,
});

// Vercel AI SDK - native integration
import { createWorkersAI } from 'workers-ai-provider';
const workersai = createWorkersAI({ binding: env.AI });

📄 Full integration guide: Load references/integrations.md for OpenAI SDK, Vercel AI SDK, and REST API examples.

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Limits Summary

Feature	Limit
Concurrent requests	No hard limit (rate limits apply)
Max input tokens	Varies by model (typically 2K-128K)
Max output tokens	Varies by model (typically 512-2048)
Streaming chunk size	~1 KB
Image size (output)	~5 MB
Request timeout	Workers timeout applies (30s default, 5m max CPU)
Daily free neurons	10,000
Rate limits	See "Rate Limits & Pricing" section

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When to Load References

Reference File	Load When...
references/models-catalog.md	Choosing a model, checking rate limits, comparing model capabilities
references/best-practices.md	Production deployment, error handling, cost optimization, security
references/integrations.md	Using OpenAI SDK, Vercel AI SDK, or REST API instead of native binding

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References

• Workers AI Docs
• Models Catalog
• AI Gateway
• Pricing