Hey @cedricziel,

Thanks for the PR, We have created "GHC-599" as the internal reference to get this reviewed.

One of us will be in touch if there are any changes needed, in most cases this is normally within a couple of weeks but it depends on the current workload of the team.

Thanks for the PR @cedricziel! I have some concerns about the current approach:

1. Using .startsWith('o1') as a guard may be problematic since we're not certain about compatibility with the new o1-2024-12-17 version being rolled out to the API this week. It's not obvious to me that this model shouldn't support system message

2. More fundamentally, this wouldn't address the core compatibility issue: neither the current o1 nor the new version supports response_format = { type: 'json_object' }. They only support type: 'json_schema'.