The Anthropic Beta Flag For Prompt Caching
ArchiveEasy
Anthropic's Messages API requires a specific per-block field on the content block(s) you want cached — a JSON object with a 'type' of 'ephemeral'. Name the field (with underscore). Flag format: CONGRESS{field_name}. Example: CONGRESS{cache_key}.
Show hint
Two words — what to cache + the act of managing it.
Archive — no submissions accepted
This challenge is preserved for reference. Play live challenges at /challenges.