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The OpenAI gateway connects ChatJS directly to the OpenAI API using the @ai-sdk/openai provider SDK. Use this when you only need OpenAI models and want the simplest setup with type-safe model IDs.

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Setup

  1. Get an API key from OpenAI Platform
  2. Add to .env.local:
OPENAI_API_KEY=sk-...
  1. Set the gateway in your config:
chat.config.ts
const config: ConfigInput = {
  ai: {
    gateway: "openai",
    workflows: {
      chat: "gpt-5-mini",
      title: "gpt-5-nano",
      // ...
    },
    // ...
  },
};

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Authentication

VariableDescription
OPENAI_API_KEYRequired. Your OpenAI API key

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Available Models

All models available to your API key (GPT, DALL-E, and embedding models). The full list is fetched at runtime and cached for 1 hour.

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Model IDs

Unlike the Vercel and OpenRouter gateways which use provider/model format, the OpenAI gateway uses bare model IDs since all models come from OpenAI:
  • gpt-5-mini
  • gpt-5-nano
  • gpt-4o
  • o3-mini
The gateway provides type-safe model IDs extracted from the @ai-sdk/openai SDK, giving you autocomplete in chat.config.ts.

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Image Generation

The OpenAI gateway supports dedicated image models through createImageModel():
  • gpt-image-1
  • gpt-image-1.5
  • dall-e-3
This enables the built-in Image Generation feature.