[BUG] usage limit with sonnet (default) with 70% of my 5 hour window available.

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?

gh issue create --repo anthropics/claude-code \
--title "Sonnet-only usage limit error (Opus/Haiku work fine)" \
--body "Getting 'You've hit your

<img width="400" height="409" alt="Image" src="https://github.com/user-attachments/assets/66e5e640-5718-4455-b708-d949ad1ef753" />

' error ONLY when using Sonnet (default), even on simple 'hello' messages with ~70% window remaining.

Works fine on:

• Opus 4.7
• Haiku 4.5

Suggests Sonnet-specific rate limit or quota issue."

What Should Happen?

I should be able to send messages on Claude Sonnet model without hitting a usage limit when 70% of my 5-hour window is still available.

Error Messages/Logs

You've hit your usage limit.

Steps to Reproduce

1. Set model to Sonnet: \/model default\
2. Send a message: type 'hello'
3. Hit submit

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Sonnet 4.6 (claude-sonnet-4-6)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_