Add support for InputImageUrl via reflection in OpenAIResponsesChatClient #7195
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…ient This adds handling for the `image_url` property in `input_image` response content. Since the OpenAI SDK doesn't yet expose this property publicly, we access it via: 1. Direct property reflection (for when the property becomes public) 2. SerializedAdditionalRawData dictionary (for internal SDK storage) 3. IJsonModel serialization fallback (to extract from JSON representation) See: openai/openai-dotnet#874 Includes a unit test that validates the image URL propagates through responses. Co-authored-by: stephentoub <[email protected]>
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Jan 5, 2026
src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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Address code review feedback by using Uri.TryCreate instead of new Uri() to gracefully handle invalid URI formats. Co-authored-by: stephentoub <[email protected]>
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[WIP] Add reflection support for part.InputImageUrl property
Add support for InputImageUrl via reflection in OpenAIResponsesChatClient
Jan 5, 2026
…ImageUrl") Address code review feedback by using the simpler inline reflection pattern as originally suggested, instead of static PropertyInfo fields and fallbacks. Co-authored-by: stephentoub <[email protected]>
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src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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…GetType()
Cache PropertyInfo using Type.GetType("OpenAI.Responses.InternalItemContentInputImage, OpenAI")
to avoid the IL2075 trimming warning and remove the #pragma disable.
Co-authored-by: stephentoub <[email protected]>
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Jan 5, 2026
src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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Check if the image URL starts with "data:" and parse as DataContent in that case. HTTP/HTTPS URLs continue to be parsed as UriContent. Added separate tests for both cases. Co-authored-by: stephentoub <[email protected]>
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Pull request overview
This PR adds temporary support for the InputImageUrl property from OpenAI API responses using reflection, since the OpenAI .NET library doesn't yet expose this property publicly (pending openai/openai-dotnet#874).
Key Changes
- Added reflection-based access to the internal
ImageUrlproperty ofInternalItemContentInputImagetype - Modified
ToAIContentsmethod to handle image URLs from API responses and convert them toUriContent - Added comprehensive unit test to verify image URLs properly propagate through response parsing
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs |
Implements reflection-based property access and integrates InputImageUrl handling into the content conversion logic |
test/Libraries/Microsoft.Extensions.AI.OpenAI.Tests/OpenAIResponseClientTests.cs |
Adds test case validating that input_image content with image_url is correctly parsed into UriContent |
src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponsesChatClient.cs
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This was referenced Jan 14, 2026
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Adds temporary support for the
InputImageUrlproperty from OpenAI API responses using reflection, since the OpenAI .NET library doesn't yet expose this property publicly (pending openai/openai-dotnet#874).Changes Made
PropertyInfousingType.GetType("OpenAI.Responses.InternalItemContentInputImage, OpenAI")?.GetProperty("ImageUrl")to access the internalImageUrlproperty without triggering trimming warningsToAIContentsmethod to properly handle image URLs:UriContentdata:) are converted toDataContentUri.TryCreatefor defensive URI parsing to handle potentially malformed URLs gracefullyUriContent) and data URI (returnsDataContent) scenariosThe reflection code includes a comment citing the upstream PR so it can be replaced with the actual public property once available.
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