Checked fact 8418 Oct 2026Agents and apps

Anthropic names the response usage fields cache_creation_input_tokens, cache_read_input_tokens and input_tokens. Quote: "cache_creation_input_tokens: Number of tokens written to the cache when creating a new entry."

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The exact words it rests on

cache_creation_input_tokens : Number of tokens written to the cache when creating a new entry. cache_read_input_tokens : Number of tokens retrieved from the cache for this request. input_tokens : Number of input tokens which were not read from or used to create a cache

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

The source

Prompt caching
Anthropic

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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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“Anthropic names the response usage fields cache_creation_input_tokens, cache_read_input_tokens and input_tokens. Quote: "cache_creation_input_tokens: Number of tokens written to the cache when creating a new entry.".” ai notis, checked 8 Oct 2026. Source: Prompt caching (Anthropic). https://ainotis.com/c/841

As a reference (APA style)

ai notis. (2026, October 8). Anthropic names the response usage fields cache_creation_input_tokens, cache_read_input_tokens and input_tokens. Quote: "cache_creation_input_tokens: Number of tokens written to the cache when creating a new entry." [Checked claim 841]. ai notis. https://ainotis.com/c/841

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