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Comment by _blk | Hacker News Reader

That'd be awesome but it doesn't reflect what I see. Do you have a source for that? What I see is if take a quick break the session loses ~5% right at the start of the next prompt processing. (I'm currently on max 5x)

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Not at my workstation right now, but simply ask claude to analyze jsonl transcript of any session, there are two cache keys there, one is 5m, another 1h. Only 1h gets set. There are also some entries there that will tell you if request was a cache hit or miss, or if cache rewrite happened. I've had claude test another claude and on max 5x subscription, cache miss only happened if message was sent after 1h, or if session was resumed using /resume or --resume (this is a bug that exists since January - all session resumes will cause a full cache rewrite).

However, cache being hit doesn't necessarily mean Anthropic won't just subtract usage from you as if it wasn't hit. It's Anthropic we're talking about. They can do whatever they want with your usage and then blame you for it.

I have heard that if you have telemetry disabled the cache is 5 minutes, otherwise 1h. No clue how true that is however my experience (with telemetry enabled) has been the 1h cache.

They've acknowledged that as a bug and have fixed it.

It's true as far as I can tell, just by my own checking using `/status`. You can also tell by when the "clear" reminder hint shows up. Also if you look at the leaked claude code you can see that almost everything in the main thread is cached with 1H TTL (I believe subagents use 5 minute TTL)

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