[BUG] Claude API requests failing even though only 41% of usage

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 am unable to use the Claude API even though my account still has available usage.

According to my usage dashboard:

Total spending so far: $20.28

Usage: 41% used

Reset date: April 1

Additional usage is enabled

Since only 41% of the usage has been used and additional usage is enabled, the API should still be available. However, API requests are currently failing or not being processed.

This behavior seems unexpected because the account should still have available quota.

What Should Happen?

The Claude API should continue to work normally since the usage has not reached the limit, and additional usage is enabled.

Requests to the API should return normal responses instead of failing or being blocked.

Error Messages/Logs

### Environment
- Claude API
- Usage dashboard shows 41% used
- Additional usage: Enabled

Steps to Reproduce

Ensure the Claude API key is valid and active.

Confirm that usage has not reached the monthly limit (dashboard shows 41% used).

Ensure additional usage is enabled in the billing settings.

Send a request to the Claude API using the existing API key.

Observe that the request fails or the API cannot be used despite available quota.

If needed, I can provide the exact error message and request example.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

January 2026 (version 1.109)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_