Vibe Coding
Tip: cheaper cache reads may make early compaction the wrong tradeoff on Fable 5.1
Anthropic's own guide now says that because cache reads dropped to $0.25/Mtok, compacting early to save cost 'may no longer be the right cost-intelligence tradeoff on Claude Fable 5.1,' and tells you to experiment with later compaction points. If you compact client-side, the recommended shape is to replace the whole history with one summary message plus the new user turn and replay nothing else, so no thinking blocks carry over and nothing fails the new binding check. This inverts the standard advice to compact aggressively.
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