Message request crash when OpenRouter has > 3 configured models

[rootasjey]

Mux version 0.21.0.

Message requests crash when I add more than 3 OpenRouter models.
I get the following error:

Stream Error [API]

'models' array must have 3 items or fewer.

I link some screenshots and debug logs if this help.

mux-llm-request-e2dca34699-2026-03-15T12-42-22-560Z.json

Thank you for this awesome app.