## Limitations
You can directly use custom models with the [POST Route Endpoint](#operation/postRoute).
To use custom models with the Route Optimization API or the Matrix API, use the [Profiles API](#tag/Custom-Profiles)
to create a new named profile with your custom model. You can then use that profile like you
would use a pre-defined profile.
This feature will strongly benefit from feedback, so do not hesitate to share your experience, your favorite custom
model or some of the problems you ran into when you tried building your own custom model.