.Net: Bug: Chat Completion Agent with Open AI `o1-preview` is not working out of the box

[fgauna12]

Describe the bug
Can't use Open AI o1-preview model with ChatCompletionAgent because it fails with the following exception.

Microsoft.SemanticKernel.HttpOperationException: HTTP 400 (invalid_request_error: unsupported_value)

Microsoft.SemanticKernel.HttpOperationException
HTTP 400 (invalid_request_error: unsupported_value)
Parameter: messages[0].role

Unsupported value: 'messages[0].role' does not support 'system' with this model.

To Reproduce
Steps to reproduce the behavior:

[Fact]
    public async Task ThisFailsAndISad()
    {
        var instructions =
            "You are a cat. You're an expert meower.";

        var configuration = new ConfigurationBuilder()
            .AddUserSecrets<SamplePromptsIntegrationTests>()
            .Build();

        var services = new ServiceCollection();

        services.AddLogging();

        var kernel = Kernel.CreateBuilder()
            .AddOpenAIChatCompletion("o1-preview", configuration["OpenAI:APIKey"]!)
            .Build();

#pragma warning disable SKEXP0110
        var agent = new ChatCompletionAgent()
        {
            Kernel = kernel,
            Instructions = instructions
        };

        ChatHistory chat =
        [
            new ChatMessageContent(AuthorRole.User, "Hello")
        ];

        await foreach (ChatMessageContent response in agent.InvokeAsync(chat))
        {
            response.Content?.ToLowerInvariant().Should().Contain("meow");
        }
#pragma warning restore SKEXP0110
    }

Expected behavior
It should just work. 🙃

Screenshots
Nah.

Platform

• OS: Windows 11
• IDE: Rider
• Language: C#
• Source:

        <PackageReference Include="Microsoft.SemanticKernel" Version="1.34.0" />
        <PackageReference Include="Microsoft.SemanticKernel.Agents.Core" Version="1.34.0-alpha" />

Additional context
Nerp.

[markwallace-microsoft]

@fgauna12 My understanding is that o1 models do not support the system message, take a look here: https://community.openai.com/t/o1-models-do-not-support-system-role-in-chat-completion/953880

And general guidance here: https://platform.openai.com/docs/guides/reasoning

[markwallace-microsoft]

@rogerbarreto we should add a sample which shows the correct usage of an o1 model.

[fgauna12]

@markwallace-microsoft Hi yes, I'm aware. I'm using the Chat Completion Agent, so I think the agent is creating a System prompt from the "Instructions."