OpenResponses API now supported on Vercel AI Gateway
By Steven Van ·
AI Gateway is a day 0 launch partner for OpenResponses, OpenAI's open-source spec for multi-provider AI calls.
Vercel's AI Gateway now supports OpenResponses, an open-source API specification from OpenAI for multi-provider AI interactions, with Vercel as a day 0 launch partner. OpenResponses gives a unified interface for text generation, streaming, tool calling, image input, and reasoning across providers.
Through AI Gateway, OpenResponses supports:
- Text generation: send messages and receive responses from any supported model
- Streaming: receive tokens as they're generated via server-sent events
- Tool calling: define functions that models can invoke with structured arguments
- Image input: send images alongside text for vision-capable models
- Reasoning: enable extended thinking with configurable effort levels
- Provider fallbacks: configure automatic fallback chains across models and providers
Developers can use OpenResponses with an existing AI Gateway key and switch models across providers by changing the model string. Full details are in the OpenResponses API documentation.
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