.Net: Bug: Unable to get Reasoning Summary/Detail when using ChatClient with Reasoning model

[MustafaJamal]

Describe the bug
Unable to get Reasoning Summary/Detail when using ChatClient with Reasoning model.

To Reproduce

Here is code:

ChatOptions chatOptions = new ChatOptions()
{
    //AllowMultipleToolCalls = useFunctionCall,
    ToolMode = useFunctionCall ? ChatToolMode.Auto : ChatToolMode.None,
    Temperature = (reasoningEffort == null || reasoningEffort == string.Empty) ? (float?)temperature : null,
    ResponseFormat = convertToJSON == true
        ? ChatResponseFormat.Json : ChatResponseFormat.Text,
    FrequencyPenalty = 0,
    PresencePenalty = 0,
    Tools = tools,
};

chatOptions.AdditionalProperties = new AdditionalPropertiesDictionary();

if (!string.IsNullOrWhiteSpace(verbosity))
{
    chatOptions.AdditionalProperties["text"] = new Dictionary<string, object?>()
    {
        { "verbosity", verbosity }
    };
}

if (!string.IsNullOrEmpty(reasoningEffort))
{
    chatOptions.AdditionalProperties["reasoning"] = new Dictionary<string, object?>()
    {
        { "effort", reasoningEffort },
        {"summary", "auto"}
    };
}

///////////

 await foreach (ChatResponseUpdate c in chatSvc.GetStreamingResponseAsync(hist, chatOptions,
                    cancellationToken: cancellationToken))
 {
     bool hadReasoning = false;

     foreach (TextReasoningContent textContent in c.Contents.OfType<TextReasoningContent>()) // <<<<<----- THIS CONDITION NEVER MEETS
     {
         hadReasoning = true;
         string reasoning = $"##{textContent.Text}";
         full += reasoning;
         yield return reasoning;
     }

     if (hadReasoning)
     {
         continue;
     }

     if (!string.IsNullOrEmpty(c.Text))
     {
         full += c.Text;
         yield return c.Text;
     }

     foreach (UsageContent usageContent in c.Contents.OfType<UsageContent>())
     {
         _usageDetails = usageContent.Details;
     }

     foreach (AIContent aiContent in c.Contents)
     {
         if (aiContent is FunctionCallContent functionCallContent) 
         {
             var (pluginName, functionName) = CoPilot.Utility.ParseFunctionName(functionCallContent.Name);
             KernelArguments kargs = CoPilot.Utility.BuildKernelArguments(functionCallContent.Arguments);

             string invocationResult;
             try
             {
                 invocationResult = await CoPilot.Utility.TryInvokeKernelFunctionAsync(kernel, pluginName,
                     functionName, kargs, cancellationToken);
             }
             catch (OperationCanceledException)
             {
                 throw;
             }
             catch (Exception ex)
             {
                 _logger.LogError(ex, "Error invoking function {FunctionFullName}", functionCallContent.Name);
                 invocationResult = $"Error invoking function {functionCallContent.Name}: {ex.Message}";
             }

             try
             {
                 CoPilot.Utility.AppendToolResultToHistory(hist, invocationResult);
             }
             catch (Exception ex)
             {
                 _logger.LogError(ex, "Failed to append tool result to chat history for {FunctionName}",
                     functionCallContent.Name);
                 hist.Add(new ChatMessage(ChatRole.Tool, invocationResult));
             }
         }
     }
 }

I have used o3, gpt-5, models but none of them giving reasoning summary.

Assembly versions:

Microsoft.SemanticKernel v1.63.0
Microsoft.SemanticKernel.Connectors.AzureOpenAI v1.63.0
Microsoft.SemanticKernel.Connectors.OpenAI v1.63.0
Environment: C# ASP.NET Core 8
OS: Windows 11

Let me know if further details are needed.

Thanks,
Mustafa

[rogerbarreto]

This is currently not supported in Microsoft.Extensions.AI for streaming as OpenAI SDK doesn't expose a public API to capture streaming thinking content.

Will keep this issue open for tracking until we have an update from the upstream dependencies.

• Add reasoning text content for OpenAI Responses ChatClient Streaming dotnet/extensions#6761
• [FEATURE REQ] Be able to retrieve Streaming Reasoning Content openai/openai-dotnet#643

[MustafaJamal]

This is currently not supported in Microsoft.Extensions.AI for streaming as OpenAI SDK doesn't expose a public API to capture streaming thinking content.

Will keep this issue open for tracking until we have an update from the upstream dependencies.

• Add reasoning text content for OpenAI Responses ChatClient Streaming dotnet/extensions#6761
• [FEATURE REQ] Be able to retrieve Streaming Reasoning Content openai/openai-dotnet#643

OK, thanks for updating.