n8n - OmniMux

Base URL: https://api.omnimux.ai (OpenAI-compatible clients usually use https://api.omnimux.ai/v1). Create a sk- key in the console. Model ids: console or GET /v1/models.

Prep

Self-host or cloud n8n
OmniMux API key

Setup

Use OpenAI node or HTTP Request
Auth: Authorization: Bearer sk-...
URL: https://api.omnimux.ai/v1/chat/completions
Body:

{
  "model": "gpt-5.4",
  "messages": [{"role": "user", "content": "hello"}]
}

Verify

Run the node and inspect choices[0].message.