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Claude Code bug can silently 10-20x API costs

https://old.reddit.com/r/ClaudeCode/comments/1s7mitf/psa_claude_code_has_two_cache_bugs_that_can
13•wg0•1h ago

Comments

esperent•21m ago
The first couple of days of this week (Claude session week I mean, Max 5x plan) I was doing some heavy data analysis and I hit 30% on day 1, then finished up the job at 50% on day 2.

But this was a lot of work. Analyzing thousands of files and extracting data from them using headless Claude sessions with a concurrency of 20 sessions at once. I have no complaints from those two days.

Then yesterday (day 3 of the week) I did some minor refactoring and bug fixes for 2 or 3 hours. Somehow that took me from 50% to 90%. This morning I finished off some of the bug fixes, maybe 45 minutes of work across ~4 twenty minutes sessions, each of involved identifying the test gap, then using a single subagent to fix it with TDD.

That took me to 100%.

Also, I'm on Asia time so I'm working entirely during off peak hours.

I now have two days to wait before the session rollover and I'm feeling quite frustrated. Whether it's a bug or they just silently reduced session limits, it's not acceptable for $200 a month.

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