AI / Claude OPUS5 Interview questions

What is the prompt caching minimum for Claude Opus 5?

The minimum prompt length eligible for caching on Claude Opus 5 is 512 tokens, down from 1,024 tokens on Claude Opus 4.8.

This means system prompts or other cacheable content that were previously too short to qualify for caching on Opus 4.8 can now create cache entries on Opus 5 automatically, with no code changes required.

For teams running high-volume agentic workloads with relatively short, frequently-reused system prompts, this lowered threshold can translate into a straightforward cost reduction simply by switching to the new model.

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Claude Opus 5's minimum cacheable prompt length is: 10,000 tokens

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1,024 tokens, unchanged from Opus 4.8

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512 tokens

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A practical benefit of this lower minimum is: short system prompts can now cache automatically with no code changes

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prompts must be rewritten in a new format to cache at all

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caching is now disabled by default

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