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I think that you send the entire conversation with every request.

As long as you stay under the 1-hour caching TTL for your open threads, I guess your marginal cost is linear.

This is me on a weekday flicking between Ghostty tabs to enter “stand by” every ~45 mins.

Anthropic changed the cache TTL to five minutes, back in March.

Thanks, didn’t realise the API and Claude Code had different TTL.