.Net: Bug: o3-mini cannot be used with OpenAIAssistantAgent

[fribergpg]

Description
To create an Assistant API-based system using OpenAI directly you need to use the OpenAIAssistantAgent entity, which takes an OpenAIAssistantDefinition, which takes a string for the model's ID.

In the background a "temperature" parameter (as well as a "top_p" parameter) seems to always be added. The problem is that the new o3 family doesn't allow these parameters to exist at all.

To Reproduce
Steps to reproduce the behavior:

1. Create the agent

            var clientProvider = OpenAIClientProvider.FromClient(new OpenAIClient(_options.ApiKey));

            var assistantDefinition = new OpenAIAssistantDefinition("o3-mini")
            {
                Instructions = AssistantInstructions,
            };

            var assistantAgent = OpenAIAssistantAgent.CreateAsync(clientProvider, assistantDefinition, kernel, cancellationToken: cancellationToken).Result;

2. Interact with the agent
3. See error

Expected behavior
A response. The model works fine in platform.openai.com --> Playground

Error message
Unsupported parameter: 'temperature' is not supported with this model.

Platform

• Language: C#
• Source: NuGet package version 1.37.0 (latest as of today, 18th of February)
• AI model: o3-mini
• IDE: Rider
• OS: MacOS

Additional context
Passing Temperature = null in the assistandDefinition didn't solve anything.

[JP-droidic]

+1, I have the same message

[JP-droidic]

Hi team, do you have any update on this or at least an idea how to mitigate this issue until there is a proper fix?

thanks

[crickman]

The latest package may address this as we've updated our approach on option handling. I'll review this scenario with the current changes.

[crickman]

I've verified Sample: Step01_Assistant.cs against o3-mini using main branch.

[JP-droidic]

YEs working for us alos - thank you