AI / Claude OPUS5 Interview questions

How does Claude Opus 5's prompt caching minimum affect short system prompts?

Because the minimum cacheable prompt length dropped from 1,024 tokens on Opus 4.8 to 512 tokens on Opus 5, system prompts that fell in that 512-1,024 token range - too short to cache before - now qualify for caching automatically.

This applies with no code changes required: simply moving the same request to Opus 5 makes previously-uncacheable short prompts eligible, rather than needing any explicit reconfiguration.

For high-volume agentic workloads that reuse a relatively short, consistent system prompt across many requests, this can translate into a real, if incidental, cost reduction purely as a side effect of migrating models rather than any deliberate prompt engineering.

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System prompts in the 512-1,024 token range now: become permanently ineligible for caching

✗ Try again if not.

qualify for caching automatically on Opus 5, with no code changes

✓ Correct! Well done.

require a complete rewrite to become cacheable

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This change is especially beneficial for: workloads with no system prompt at all

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one-off requests that never repeat

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high-volume workloads reusing a short, consistent system prompt

✓ Correct! Well done.

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