AI / Claude Sonnet5 Interview questions

How does prompt caching behavior change when migrating to Claude Sonnet 5?

Prompt caching itself remains a supported feature on Sonnet 5, carried over unchanged from Sonnet 4.6 as part of the broader feature parity between the two versions.

What does change is the underlying token counts: because Sonnet 5's new tokenizer maps the same text to a different number of tokens than Sonnet 4.6's tokenizer did, cached token counts for a given prompt will differ between the two models even if the prompt text itself is byte-for-byte identical.

The practical implication is that cache breakpoints and minimum-length thresholds sized against Sonnet 4.6 token counts need to be re-verified against Sonnet 5's actual token counts, rather than assumed to carry over directly, since a prompt's token length relative to any caching threshold can shift purely from the tokenizer change.

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Prompt caching as a feature on Sonnet 5 is: available only at high effort

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removed entirely

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supported, unchanged from Sonnet 4.6

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Cache breakpoints sized against Sonnet 4.6 token counts should be: re-verified against Sonnet 5's actual token counts

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doubled automatically with no need to check

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left completely unchanged, since nothing about caching is affected

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