[BUG] Fable 5.1 Burning usage twice in less than an hour doing nothing complicated

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I have started using Fable 5.1 today to help me build a workflow for literature base, and twice in a row I ran out of the limit in less than 1 hour. I was doing a similar task yesterday with Opus 5, and an even more demanding one, and I never ran into the limits issue. For me, it feels more like a bug than just normal usage limits. I am on 20x Max plan.

What Should Happen?

I don't expect Claude to run into a usage limit that fast, especially since I am on the 20x Max plan.

Error Messages/Logs

Steps to Reproduce

Just look on my usage of today.

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.258

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_