Ask HN: Claude Code randomly burning through 10% of the weekly limit?

I'm using the biggest plan, yet sometimes Claude randomly burns through a huge portion of the weekly limit. The limit had just reset, and I found myself with 9% usage within 10 minutes. During the previous week, I had used Ultracode and agent swarms with no such jumps in usage. Does enabling Fable 5 use such a noticeably larger amount of tokens? Has anyone else noticed this on their end?