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Open Responses Specification Open Responses · /v1/responses

Open Responses Specification is an agentic-web standard (endpoint — /v1/responses) at step 5, Act, governed by Linux Foundation; its status is "Published specification & conformance suite under Linux…". It answers: "How can an agent or application call LLM inference and server-side tool loops across multiple providers using a single…?" Replacing or extending OpenAI Chat Completions API, implementation status is multi-implementation (OpenAI, Hugging Face, Vercel, OpenRouter, Ollama…), last verified 2026-10-24.

Act Open Responses is an open inference and agentic-loop API specification launched in January 2026 under the Linux Foundation, seeded by OpenAI’s Responses API (POST /v1/responses) with founding support from Hugging Face, Vercel, OpenRouter, Ollama, vLLM, SGLang, LM Studio, LiteLLM, and Anyscale [1][2].

Overview

Unlike legacy chat/completions endpoints that exchange stateless message arrays, Open Responses defines polymorphic items (message, function_call, function_call_output, reasoning), structured semantic streaming events (response.created, response.output_item.added, response.output_text.delta, response.completed), and multi-turn server-side tool execution loops (previous_response_id, hosted MCP tool calls, and client-side function calls) in a vendor-neutral OpenAPI 3.1 contract [1][2].

Discovery and probe

Published OpenAPI 3.1 contract or API documentation declaring POST /v1/responses · /v1/responses

POST /v1/responses
parse:     JSON response object with object="response" or streaming response.* SSE events
on absent: HTTP 404 or non-Open-Responses JSON payload

Not probed live: no-fixed-path. Open Responses defines the /v1/responses inference and tool-calling API schema rather than a public root discovery manifest.

History

Instances

Verified SDKs, reference implementations & validators:

See also

References

  1. Open Responses launched in January 2026 under the Linux Foundation with OpenAI, Hugging Face, Vercel, OpenRouter, Ollama, vLLM, SGLang, and LM Studio as founding adopters. — https://www.openresponses.org/specification (2026-01-15) VERIFIED
  2. github.com/openresponses/openresponses hosts the normative OpenAPI 3.1 schema and conformance test suite for the /v1/responses agentic loop endpoint. — https://github.com/openresponses/openresponses (2026-01-15) VERIFIED

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