Checked fact 8428 Oct 2026Agents and apps

OpenAI says to track usage.input_tokens_details.cached_tokens and usage.input_tokens_details.cache_write_tokens to measure actual cache performance. Quote: "Track usage.input_tokens_details.cached_tokens, usage.input_tokens_details.cache_write_tokens"

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The exact words it rests on

Track usage.input_tokens_details.cached_tokens , usage.input_tokens_details.cache_write_tokens , input-token counts, latency, and realized cost.

What the source said when we opened it, on 8 Oct 2026.

The source

Prompt caching
OpenAI

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Checked

Checked by the notis newsroom on 8 Oct 2026, against the source above.

In the story

How prompt caching bills a repeated prompt start 8 Oct 2026

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“OpenAI says to track usage.input_tokens_details.cached_tokens and usage.input_tokens_details.cache_write_tokens to measure actual cache performance. Quote: "Track usage.input_tokens_details.cached_tokens, usage.input_tokens_details.cache_write_tokens".” ai notis, checked 8 Oct 2026. Source: Prompt caching (OpenAI). https://ainotis.com/c/842

As a reference (APA style)

ai notis. (2026, October 8). OpenAI says to track usage.input_tokens_details.cached_tokens and usage.input_tokens_details.cache_write_tokens to measure actual cache performance. Quote: "Track usage.input_tokens_details.cached_tokens, usage.input_tokens_details.cache_write_tokens" [Checked claim 842]. ai notis. https://ainotis.com/c/842

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