Outside of pure security, we've seen many choose Onyx for flexibility + connectedness.

One of our largest users has forked the repo and has 20+ commits back to the repo of small customizations that are important for them (and that they could never get with ChatGPT Enterprise).

Lots of companies we talk to value having the best model for the job (e.g. not being tied to ONLY OpenAI models for example).

Compared to model provider offerings, we also (thanks to open-source contributions) cover many more existing apps when it comes to connectors.