BYOK in Microsoft Foundry only works with certain models

[aatek]

Short summary

When I try different ChatGPT models besides GPT-5 I get errors

Affected version or release

v1.0.8

Installation context

No response

What happened?

I'm connecting my Microsoft Foundry resource where I've deployed several models. I've deployed:

when I use gpt-5, all works as expected. However, when I use gpt-5.3-codex I get the following error:

I have tried the different models in the foundry playgrounds and they work as expected.

Steps to reproduce

• Setup Microsoft foundry model provider
• deploy different models like gpt-5.3-codex
• attempt to make any sort of chat

Expected behavior

Should work with different models besides gpt-5

Additional context

No response