How do I get "thought process" info while streaming?

[richardtallent-erm]

I have a streamed chat completion request using reasoning models. Sometimes it takes upwards of a few minutes of "thinking" before it starts streaming back its answer. I'd like to notify the user during that wait, and also maybe store the thought process so I can review it to improve my prompts.

I thought this information might be coming back as "reasoning content," but I added this code to my loop, and the foreach doesn't actually get any completions until it starts streaming back the final answer:

await foreach (var completion in completionResult) {
	var firstChoice = completion.Choices?.FirstOrDefault();
	if (reasoningProcessor is not null) {
		var thought = firstChoice?.Message?.ReasoningContent ?? string.Empty;
		if (!string.IsNullOrEmpty(thought)) {
			reasoningProcessor.Invoke(session, call, thought);
		}
	}
	// Continue processing completion, checking for errors, etc...
}

Is there some other method or callback I can use to capture the pre-completion thoughts?