models with a slash in them only use the part after the slash :-(

i have a custom provider
the provider takes a list of possible models
```
models=["allenai/tulu2-1", "allenai/tulu2-2", "allenai/tulu2-3", "allenai/tulu2-4"],
```
this shows properly in the ui, but when the provider calls the model py method i see `print(model) => tulu2-1`
(note the missing 'allenai/')
i also tried,
```
models=["allenai//tulu2-1", "allenai//tulu2-2", "allenai//tulu2-3", "allenai//tulu2-4"],
```
with no change.

please allow passing mull model name to the provider
(note, i am not blocked, in this case, i can hardcode the missing part...)

thanks!