Vercel AI Gateway is a day 0 launch partner for the OpenResponses API, an open-source specification from OpenAI for multi-provider AI interactions. OpenResponses provides a unified interface for text generation, streaming, tool calling, image input, and reasoning across providers. AI Gateway supports OpenResponses for: 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. Use OpenResponses with your AI Gateway key, and switch models across providers by changing the model string.…