{"name":"OpenAI Responses API","tagline":"OpenAI's agent-building API — tools, web search and file search built in.","url":"https://platform.openai.com/docs/api-reference/responses","category":"agents","pricing":"paid","price_note":"pay-per-token; e.g. GPT-5.6 Luna $0.20/1M input","free_tier":false,"open_source":false,"api":true,"self_host":false,"models_used":["gpt-5-6-terra","gpt-5-4-mini","gpt-5-6-sol","gpt-5-6-luna"],"model_routing":"locked","verdict":"ship","verdict_text":"Hosted web search, file search, and code interpreter without building plumbing — the most batteries-included agent API. Conversation state lives on OpenAI's side, which keeps things simple until it doesn't. A sensible default if you want an agent running today instead of wiring your own graph.","limitations":["Hosted-tool pricing (storage, search calls) sneaks up on you.","Conversation state lives on OpenAI's side.","Less controllable than explicit-graph frameworks like LangGraph.","Assistants API sunsets 2026-08-26 — Responses is the default for new projects."],"strengths":["Batteries-included agent API: hosted web search, file search and code interpreter.","Sensible default when you want an agent running today, not a graph framework."],"use_for":["New OpenAI agent projects after the Assistants sunset.","Prototypes that should use hosted tools instead of your own retrieval."],"skip_when":["Hosted-tool storage and search pricing would sneak up.","Conversation state cannot live on OpenAI's side.","You need LangGraph-level control of the graph."],"receipts":["https://platform.openai.com/docs/api-reference/responses","https://platform.openai.com/docs/pricing"],"affiliate":"none","evidence_tier":"source-verified","momentum":"blueshift","featured":false,"last_verified":"2026-08-19","observed_by":"whysanesanders","slug":"openai-responses","canonical_url":"https://noemium.com/tools/openai-responses/","attribution":"Noemium catalog data is licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). See https://noemium.com/method/ for how entries are verified."}