Open Responses: An Interoperable LLM Interface Specification

Open Responses is a community-governed, vendor-neutral specification designed to standardize how developers interact with large language models. By providing a unified schema and client library, it allows applications to remain interoperable across different providers like OpenAI, Anthropic, and Google. The protocol is built around an agentic loop where the model can reason, invoke tools, and manage complex workflows through a system of polymorphic items. Technical oversight is managed by a Technical Steering Committee to ensure the project remains open and competitive without single-vendor control. This architecture improves efficiency and performance by preserving reasoning states and utilizing semantic streaming events. Ultimately, the framework aims to simplify multimodal integration while offering a stable foundation for the future of AI development.