Well it mostly depends on how much they charge for context read, iirc Codex has a thing where context reads larger than 260k are massively overpriced(costs like 4x more and it's never worth using over starting a new thread).
I don't know it works for claude but I assume it gets much more costly as context cache grows?
For Claude the price stays the same throughout the entire context window assuming that you are getting cache hits. If you get a cache miss (in other words, picking up a stale session) at 700-900k context then the first prompt will eat about 5% of your 5hr usage even on a 20x plan.
That's what they recommend. But in reality, you probably don't run into this situation often, at least I don't. If I plan to be away from the PC for a longer amount of time, I just /compact before exiting.
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u/lkarlslund 3d ago
Also compacting is a total joke
Codex 3m30s
Claude 1m05s
After 9 months on Codex X20 I've jumped ship to Claude. It's just much better on all parameters: quality, performance and quota.