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Exclusive access? Source?

Might be old (2020), as OpenAI models are now also covered by Quora for Poe.com and others: https://blogs.microsoft.com/blog/2020/09/22/microsoft-teams-...

They probably just call the public API same as everyone else using it outside Microsoft.

The exclusive license refers to having access to the models, which is probably why they were able to finetune Bing AI.