The problem

The o3 models have the reasoning level modal available.

But gpt5 family of models does not. According to the official docs the values are: minimal, low, medium, and high (notice that minimal is a new value not present before).

What version of Home Assistant Core has the issue?

core-2025.8.0

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant Container

Integration causing the issue

OpenAI Conversation

Link to integration documentation on our website

https://www.home-assistant.io/integrations/openai_conversation/

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response