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`/docs/ai-sdk/authentication` does not exist. Similar pages:

- [Authentication & BYOK](/docs/ai-gateway/authentication-and-byok.md): Every request to AI Gateway requires authentication. Vercel provides two methodsAPI keys and OIDC tokens. You can also bring your own provider
- [REST API Reference](/docs/ai-gateway/sdks-and-apis/rest-api.md): For sending inference requests, the AI SDK is the easiest way to interact with AI Gateway. You can also send requests through the chat completions,
- [Python](/docs/ai-gateway/sdks-and-apis/python.md): To get started with Python and AI Gateway, you can either call the OpenAI Chat Completions, OpenAI Responses, or Anthropic Messages API directly, or
- [Authentication](/docs/ai-gateway/sdks-and-apis/ai-sdk.md): The AI SDK uses the AI_GATEWAY_API_KEY environment variable by default. Set it in your .env.local file.env.local

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