Checked fact 8218 Oct 2026Agents and apps

Anthropic says cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control. Quote: "Cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control."

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Exact matching: Cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control.

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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In a sentence

“Anthropic says cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control. Quote: "Cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control.".” ai notis, checked 8 Oct 2026. Source: Prompt caching (Anthropic). https://ainotis.com/c/821

As a reference (APA style)

ai notis. (2026, October 8). Anthropic says cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control. Quote: "Cache hits require 100% identical prompt segments, including all text and images up to and including the block marked with cache control." [Checked claim 821]. ai notis. https://ainotis.com/c/821

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