MicrosoftExtensions: Cached Input Token counts are incorrectly doubled

[PederHP]

Summing up usage during streaming gives twice the expected number (the one reported in the Anthropic console logs, and the one matching tokens actually sent).

UsageContent content = fromSomewhereElse();
var tokens = usage.AdditionalCounts?.GetValueOrDefault("CacheCreationInputTokens")`;

This is on next and with 10.0.1 of Microsoft.Extensions.AI.

Edit: Same with cache hits

[TomerAberbach]

@stephentoub

[stephentoub]

Summing up usage during streaming gives twice the expected number

I'm not following. Are you saying multiple streaming updates contain the same usage information such that it ends up being counted each time?

[PederHP]

Thought I had created a repro, will do so