--- title: SDKs & APIs product: vercel url: /docs/ai-gateway/sdks-and-apis type: conceptual prerequisites: - /docs/ai-gateway related: - /docs/ai-gateway/sdks-and-apis/ai-sdk - /docs/ai-gateway/sdks-and-apis/responses - /docs/ai-gateway/sdks-and-apis/openai-chat-completions - /docs/ai-gateway/sdks-and-apis/openai-chat-completions/chat-completions - /docs/ai-gateway/sdks-and-apis/openai-chat-completions/tool-calls summary: Use the AI Gateway with various SDKs and API specifications including OpenAI, Anthropic, and OpenResponses. install_vercel_plugin: npx plugins add vercel/vercel-plugin --- # SDKs & APIs AI Gateway provides drop-in compatible APIs that let you switch by changing a base URL. No code rewrites required. Use the same SDKs and tools you already know, with access to 200+ models from every major provider. ## Quick start Point your existing SDK to the gateway: #### AI SDK ```bash package-manager npm i ai ``` ```typescript import { generateText } from 'ai'; const { text } = await generateText({ model: 'anthropic/claude-opus-4.6', prompt: 'Hello!', }); ``` #### Chat Completions ```typescript import OpenAI from 'openai'; const client = new OpenAI({ apiKey: process.env.AI_GATEWAY_API_KEY, baseURL: 'https://ai-gateway.vercel.sh/v1', }); const response = await client.chat.completions.create({ model: 'anthropic/claude-opus-4.6', messages: [{ role: 'user', content: 'Hello!' }], }); ``` #### OpenAI Responses ```typescript import OpenAI from 'openai'; const client = new OpenAI({ apiKey: process.env.AI_GATEWAY_API_KEY, baseURL: 'https://ai-gateway.vercel.sh/v1', }); const response = await client.responses.create({ model: 'anthropic/claude-opus-4.6', input: 'Hello!', }); ``` #### Anthropic Messages ```typescript import Anthropic from '@anthropic-ai/sdk'; const client = new Anthropic({ apiKey: process.env.AI_GATEWAY_API_KEY, baseURL: 'https://ai-gateway.vercel.sh', }); const message = await client.messages.create({ model: 'anthropic/claude-opus-4.6', max_tokens: 1024, messages: [{ role: 'user', content: 'Hello!' }], }); ``` #### OpenResponses ```typescript import OpenAI from 'openai'; const client = new OpenAI({ apiKey: process.env.AI_GATEWAY_API_KEY, baseURL: 'https://ai-gateway.vercel.sh/v1', }); const response = await client.responses.create({ model: 'anthropic/claude-opus-4.6', input: 'Hello!', }); ``` ## Why use these APIs? - **No vendor lock-in**: Switch between Claude, GPT, Gemini, and other models without changing your code - **Unified billing**: One invoice for all providers instead of managing multiple accounts - **Built-in fallbacks**: Automatic retry with alternative providers if one fails - **Streaming support**: Real-time responses with SSE across all compatible endpoints - **Full feature parity**: Tool calling, structured outputs, vision, and embeddings work exactly as documented ## Available APIs | API | Best for | Documentation | | ------------------------------------------------------------------------------------- | -------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [AI SDK](/docs/ai-gateway/sdks-and-apis/ai-sdk) (recommended) | Normalizes provider differences, works with AI Gateway automatically | [Streaming](/docs/ai-gateway/sdks-and-apis/ai-sdk#streaming), [Structured outputs](/docs/ai-gateway/sdks-and-apis/ai-sdk#structured-outputs), [Tools](/docs/ai-gateway/sdks-and-apis/ai-sdk#tool-calling) | | [OpenAI Responses API](/docs/ai-gateway/sdks-and-apis/responses) | OpenAI Responses API users | [Streaming](/docs/ai-gateway/sdks-and-apis/responses#streaming), [Tools](/docs/ai-gateway/sdks-and-apis/responses#tool-calling), [Structured output](/docs/ai-gateway/sdks-and-apis/responses#structured-output) | | [OpenAI Chat Completions API](/docs/ai-gateway/sdks-and-apis/openai-chat-completions) | Existing OpenAI integrations, broad language support | [Chat](/docs/ai-gateway/sdks-and-apis/openai-chat-completions/chat-completions), [Tools](/docs/ai-gateway/sdks-and-apis/openai-chat-completions/tool-calls), [Embeddings](/docs/ai-gateway/sdks-and-apis/openai-chat-completions/embeddings) | | [Anthropic Messages API](/docs/ai-gateway/sdks-and-apis/anthropic-messages-api) | Claude Code, Anthropic SDK users | [Messages](/docs/ai-gateway/sdks-and-apis/anthropic-messages-api/messages), [Tools](/docs/ai-gateway/sdks-and-apis/anthropic-messages-api/tool-calls), [Files](/docs/ai-gateway/sdks-and-apis/anthropic-messages-api/file-attachments) | | [OpenResponses](/docs/ai-gateway/sdks-and-apis/openresponses) | New projects, provider-agnostic design | [Streaming](/docs/ai-gateway/sdks-and-apis/openresponses/streaming), [Tools](/docs/ai-gateway/sdks-and-apis/openresponses/tool-calling), [Vision](/docs/ai-gateway/sdks-and-apis/openresponses/image-input) | | [Python](/docs/ai-gateway/sdks-and-apis/python) | Python developers | [Async](/docs/ai-gateway/sdks-and-apis/python#async-support), [Streaming](/docs/ai-gateway/sdks-and-apis/python#streaming), [Frameworks](/docs/ai-gateway/sdks-and-apis/python#framework-integrations) | ## Choosing an API - **New project?** Use [AI SDK](/docs/ai-gateway/sdks-and-apis/ai-sdk). It handles provider differences for you and supports streaming, structured outputs, tool calling, and reasoning across all providers. - **Using the OpenAI SDK?** The [OpenAI Responses API](/docs/ai-gateway/sdks-and-apis/responses) and [Chat Completions API](/docs/ai-gateway/sdks-and-apis/openai-chat-completions) both work by changing your base URL. - **Using Claude Code or the Anthropic SDK?** Use the [Anthropic Messages API](/docs/ai-gateway/sdks-and-apis/anthropic-messages-api) for native feature support. - **Want a provider-agnostic REST API?** Use [OpenResponses](/docs/ai-gateway/sdks-and-apis/openresponses). ## Next steps - [Get your API key](/docs/ai-gateway/authentication-and-byok/authentication) to start making requests - [Browse available models](/docs/ai-gateway/models-and-providers) to find the right model for your use case - [Set up observability](/docs/ai-gateway/capabilities/observability) to monitor usage and debug requests --- [View full sitemap](/docs/sitemap)