Lack of InputTokenDetails in ResponseTokenUsage in Responses API

[Tinyakov]

Service

OpenAI

Describe the bug

The InputTokenDetails property is missing in OpenAI.Responses.ResponseTokenUsage class, even though it is documented in the API here:
https://platform.openai.com/docs/api-reference/responses/object (input_tokens_details).

Similar property is available in OpenAI.Chat.ChatTokenUsage.

Steps to reproduce

I’m migrating code from the Chat API to the Responses API and encountered the issue that the number of cached tokens cannot be retrieved due to the absence of InputTokenDetails.

Code snippets

OS

macOS

.NET version

9.0

Library version

2.2.0-beta.4