{
 "acronym": "Open Responses",
 "adoption": {
  "by": "OpenAI, Hugging Face, Vercel, OpenRouter, Ollama, vLLM, SGLang, LM Studio, LiteLLM, Anyscale",
  "level": "observed",
  "probe_run": null
 },
 "aliases": [
  "openresponses",
  "v1/responses"
 ],
 "analog": "OpenAI Chat Completions API",
 "audience": [
  "agent-builder",
  "platform",
  "standards-body"
 ],
 "collisions": [
  "mcp",
  "agent-protocol"
 ],
 "discovery": {
  "mechanism": "Published OpenAPI 3.1 contract or API documentation declaring POST /v1/responses",
  "path": "/v1/responses"
 },
 "dispute": null,
 "evidence": [
  {
   "claim": "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.",
   "date": "2026-01-15",
   "label": "VERIFIED",
   "url": "https://www.openresponses.org/specification"
  },
  {
   "claim": "github.com/openresponses/openresponses hosts the normative OpenAPI 3.1 schema and conformance test suite for the /v1/responses agentic loop endpoint.",
   "date": "2026-01-15",
   "label": "VERIFIED",
   "url": "https://github.com/openresponses/openresponses"
  }
 ],
 "form": "endpoint",
 "governance": "Linux Foundation (Open Responses project, seeded by OpenAI with Hugging Face, Vercel, OpenRouter, vLLM, SGLang, Ollama)",
 "group": null,
 "history": [
  {
   "date": "2026-10-24",
   "note": "added to catalogue (v1.1.0 audit)"
  }
 ],
 "id": "open-responses",
 "implementation": "multi-implementation",
 "last_verified": "2026-10-24",
 "name": "Open Responses Specification",
 "native_status": "Published specification & conformance suite under Linux Foundation",
 "origin": {
  "date": "2026-01",
  "org": "OpenAI / Linux Foundation"
 },
 "pairs_with": [
  "mcp",
  "a2a"
 ],
 "part_of": null,
 "parties": [
  "agent-agent",
  "agent-site"
 ],
 "phase": "stable",
 "prerequisites": [],
 "probe": {
  "method": "POST",
  "on_absent": "HTTP 404 or non-Open-Responses JSON payload",
  "parse": "JSON response object with object=\"response\" or streaming response.* SSE events",
  "path": "/v1/responses"
 },
 "question": "How can an agent or application call LLM inference and server-side tool loops across multiple providers using a single vendor-neutral wire format?",
 "scope": "general",
 "spec_url": "https://www.openresponses.org/specification",
 "step": "act",
 "summary_md": "**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].\n\nUnlike 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].",
 "track": "linux-foundation",
 "use_cases": [
  "expose-tools-to-agents",
  "agent-to-agent-messaging"
 ],
 "version": {
  "date": "2026-01-15",
  "label": "1.0"
 },
 "watch": [
  {
   "mode": "commit",
   "repo": "openresponses/openresponses",
   "type": "github"
  },
  {
   "cadence": "weekly",
   "selector": "main",
   "type": "page",
   "url": "https://www.openresponses.org/specification"
  }
 ],
 "freshness": "current"
}