Update Microsoft.Extensions.AI to 10.2.0

[Copilot]

Bumps Microsoft.Extensions.AI and Microsoft.Extensions.AI.Abstractions from 10.1.1 to 10.2.0, resolving merge conflicts from Dependabot PR #1162.

Changes

• Updated MicrosoftExtensionsVersion property in Directory.Packages.props from 10.1.1 to 10.2.0
• Updated Microsoft.Extensions.AI.OpenAI from 10.1.1-preview.1.25612.2 to 10.2.0-preview.1.26063.2

API Changes in 10.2.0

Adds two properties to UsageDetails for token accounting:

• CachedInputTokenCount - tokens read from cache
• ReasoningTokenCount - tokens used for model reasoning

These are additive changes. No code modifications required as the SDK uses UsageDetails indirectly and doesn't reference these properties.

Verification

• ✅ Build succeeded with 0 warnings and 0 errors
• ✅ All tests pass (1063 passed, 0 failed)
• ✅ Compatible with .NET 8.0, 9.0, and 10.0

Original prompt

Summary

Update Microsoft.Extensions.AI and Microsoft.Extensions.AI.Abstractions packages from version 10.1.1 to 10.2.0, resolving any merge conflicts with the current main branch.

Background

Dependabot PR #1162 attempted to bump Microsoft.Extensions.AI to 10.2.0 but has merge conflicts ("dirty" mergeable state). This PR should accomplish the same update while ensuring compatibility with the current main branch.

Changes Required

1. Update Directory.Packages.props: Change the MicrosoftExtensionsVersion property from 10.1.1 to 10.2.0:

   <MicrosoftExtensionsVersion>10.2.0</MicrosoftExtensionsVersion>

2. Update test dependency if needed: The Microsoft.Extensions.AI.OpenAI package version may also need updating to a compatible 10.2.0 preview version if available. Currently it's at 10.1.1-preview.1.25612.2.

API Changes in 10.2.0

The 10.2.0 release includes the following notable changes from dotnet/extensions PR #7122:

• Added UsageDetails.CachedInputTokenCount property - for tokens read from a cache
• Added UsageDetails.ReasoningTokenCount property - for reasoning/thinking tokens used internally by models

These are additive changes and should not require any code modifications in the csharp-sdk, as the existing code doesn't directly reference these new properties. The codebase uses UsageDetails indirectly through ChatResponse and ToChatResponse() in AIContentExtensions.cs.

Files to Modify

• Directory.Packages.props - Update the MicrosoftExtensionsVersion property value

Testing

• Ensure the solution builds successfully
• Ensure all existing tests pass
• No new tests should be required as these are additive API changes

References

• Dependabot PR: Bump Microsoft.Extensions.AI from 10.1.1 to 10.2.0 #1162
• Microsoft.Extensions.AI 10.2.0 release: https://github.com/dotnet/extensions/releases/tag/v10.2.0
• UsageDetails token counting PR: Augment UsageDetails with cached / reasoning token counts dotnet/extensions#7122

This pull request was created from Copilot chat.

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[stephentoub]

Microsoft.Extensions.AI.OpenAI remains at 10.1.1-preview.1.25612.2 and is compatible with the updated packages.

@copilot, can you update it to 10.2.0-preview.1.26063.2 ?

[Copilot]

Microsoft.Extensions.AI.OpenAI remains at 10.1.1-preview.1.25612.2 and is compatible with the updated packages.

@copilot, can you update it to 10.2.0-preview.1.26063.2 ?

Updated to 10.2.0-preview.1.26063.2 in commit b64afc7. Build and all tests pass successfully.