The era of the chatbot is long gone, and agents dominate inference workloads. Developers are shifting toward autonomous systems that reason, plan, and act over long-time horizons. Despite this shift, much of the ecosystem still uses the Chat Completion format, which was designed for turn-based conversations and falls short for agentic use cases. The Responses format was designed to address these limitations, but it is closed and not as widely adopted. The Chat Completion format is still the de facto standard despite the alternatives.

This mismatch between the agentic workflow requirements and entrenched interfaces motivates the need for an open inference standard. Over the coming months, we will collaborate with the community and inference providers to implement and adapt Open Responses to a shared format, practically capable of replacing chat completions.

Open Responses builds on the direction OpenAI has set with their Responses API launched in March 2025, which superseded the existing Completion and Assistants APIs with a consistent way to:

Open Responses extends and open-sources the Responses API, making it more accessible for builders and routing providers to interoperate and collaborate on shared interests.

We’ll briefly explore the core changes that impact most community members. If you want to deep dive into the specification, check out the Open Responses documentation.

Client requests to Open Responses are similar to the existing Responses API. Below we demonstrate a request to the Open Responses API using curl. We're calling a proxy endpoint that routes to Inference Providers using the Open Responses API schema.

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