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OpenAI donates Open Responses, its spec for a common LLM API, to the Agentic AI Foundation

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OpenAI donates Open Responses, its spec for a common LLM API, to the Agentic AI Foundation

OpenAI on Thursday announced that it is donating the Open Responses API specification to the open source Agentic AI Foundation (AAIF).

In addition to Open Responses, OpenSandbox, Anthropic’s Agent Skills, and HuggingFace’s OpenEv framework for agent environments are also joining the AAIF.

The join other AAIF projects like the MCP and A2A protocols, AGENTS.md (also from OpenAI), the open source AI agent goose, agentgateway, and Agent Router. The foundation, which is part of the Linux Foundation, launched in December 2025, with MCP, goose, and AGENTS.md as its first projects.

As for Open Responses, the core idea here is to provide developers with a set of core API calls that should work across LLM providers. When OpenAI first announced the specification in January, the team behind the project noted that virtually all LLM providers now offer the same building blocks (messages, tool calls, function calling, etc.), but that they also all represent them differently in their APIs.

Open Responses aims to create a spec that standardizes these primitives so that developers don’t have to translate between each vendor’s idiosyncratic API when they switch between models.

md, a way to give coding agents project-specific instructions,” an OpenAI spokesperson told The New Stack. “Open Responses addresses another part of building agents by giving developers a shared format for working with models across endpoints that support it, so they have fewer provider-specific integrations to maintain.



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