[BUG] Claude Code all prompts are rejected with 400 invalid_request_error and a strange message

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?

Every time I send a prompt using cluade code I get hit with this in response:

 API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Third-party apps now draw from your extra usage, not your plan limits. We've added a $100 credit to get you started. Claim it at claude.ai/settings/usage and 
    keep going."},"request_id":"req_011CZqfnrANqK3XgQUkTj9gv"}
`

### What Should Happen?

Claude accepts my prompt and continues with the task at hand.

### Error Messages/Logs

```shell

Steps to Reproduce

1. Login to Claude
2. Send a prompt
3. get this error repsonse: `API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Third-party apps now draw from your extra usage, not your plan limits. We've added a $100 credit to get you started. Claim it at claude.ai/settings/usage and

keep going."},"request_id":"req_011CZqfnrANqK3XgQUkTj9gv"}`

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Even claude --version returns the same error response

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_