I think for the moment you can only go in Admin > Providers and fill your API Key (OpenAI), but this will only be used if you use Dust Apps (not used by Dust assistants)
To be double checked with Remi
Thanks for your questions! OpenAI still has some strong limitations on o1 pro via API.
The team will be releasing o1 to enterprise customers soon (after Christmas) 🎄Stay tuned !