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Yield final image when streaming with HostedImageGenerationTool #7774

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Yield final image when streaming with HostedImageGenerationTool #7774

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38cdad5
Yield final image when streaming with HostedImageGenerationTool
iamAdarshh Sep 23, 2026
21edcd9
Yield image result for every completed image generation item when str…
iamAdarshh Oct 9, 2026
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21 changes: 17 additions & 4 deletions src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -605,6 +605,15 @@ ChatResponseUpdate CreateUpdate(AIContent? content = null) =>
yield return CreateUpdate(CreateReasoningContent(text: null, protectedData: encryptedContent, itemId: rri.Id));
break;

// The ImageGenerationToolCallContent has already been yielded as part of in-progress updates,
// but any partial images yielded along the way are lower-quality intermediate renders rather than
// deltas of the final image. Yield the final image here; coalescing will replace the partial
// results with this one, since they share the same CallId. This mirrors the non-streaming path,
// which produces a result for every ImageGenerationCallResponseItem.
case ImageGenerationCallResponseItem imageGenItem:
yield return CreateUpdate(CreateImageGenerationResultContent(imageGenItem, options));
break;

// For ResponseItems where we've already yielded partial deltas for the whole content,
// we still want to yield an update, but we don't want it to include the ResponseItem
// as the RawRepresentation, since if it did, when roundtripping we'd end up sending
Expand Down Expand Up @@ -1966,17 +1975,21 @@ private static void AddHostedFileContents(List<AIContent> contents, CodeInterpre
}

private static void AddImageGenerationContents(ImageGenerationCallResponseItem outputItem, CreateResponseOptions? options, IList<AIContent> contents)
{
contents.Add(new ImageGenerationToolCallContent(outputItem.Id));
contents.Add(CreateImageGenerationResultContent(outputItem, options));
}

private static ImageGenerationToolResultContent CreateImageGenerationResultContent(ImageGenerationCallResponseItem outputItem, CreateResponseOptions? options)
{
var imageGenTool = options?.Tools.OfType<ImageGenerationTool>().FirstOrDefault();
string outputFormat = imageGenTool?.OutputFileFormat?.ToString() ?? "png";

contents.Add(new ImageGenerationToolCallContent(outputItem.Id));

contents.Add(new ImageGenerationToolResultContent(outputItem.Id)
return new ImageGenerationToolResultContent(outputItem.Id)
{
RawRepresentation = outputItem,
Outputs = [new DataContent(outputItem.ImageResultBytes, $"image/{outputFormat}")]
});
};
}

private static ImageGenerationToolResultContent GetImageGenerationResult(StreamingResponseImageGenerationCallPartialImageUpdate update, CreateResponseOptions? options)
Expand Down
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