Ai agent

Sep 19, 202611 min read

Using n8n with an Open LLM API: One Credential Field, One Toggle, and the Node That Will Not Work

n8n talks to any OpenAI-compatible endpoint through the Base URL field of its OpenAI credential, and its OpenAI Chat Model node lists whatever /v1/models returns. n8n's OpenAI nodes now default to the Responses API, which most open endpoints answer with a 404; ours serves it, and both the Chat Model and the OpenAI node's Message a Model work. The setup, tested on n8n 2.38, a ticket-triage workflow you can import, and the one Extra Body line that cut the model's answer from 3.3 s to 1.0 s.