Guides & Tutorials11 min read
The OpenAI Responses API on Open Models: responses.create, the Agents SDK and n8n, Measured on Qwen 3.8
Tools are moving from Chat Completions to OpenAI's Responses API, and most open-model endpoints answer it with a 404. We now serve /v1/responses on Qwen 3.8 27B and ran the official OpenAI SDK, the OpenAI Agents SDK and n8n against it unchanged: all 10 SDK checks behaved as designed, a 24-task tool-using agent correct 24 of 24 through all three paths, and no measurable latency added by the translation. What is not supported, and the one setting that cut an n8n node from 3.3 s to 1.0 s.
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