rateLimitTier set to "default_claude_ai" instead of "default_claude_pro" on Pro subscription — rate limit error with zero 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?

Related to issue #39604

Subscription: Claude Pro
Platform: Windows / PowerShell
Claude Code version: (run claude --version and include the output)
Credentials after fresh claude auth login:
"subscriptionType": "pro", "rateLimitTier": "default_claude_ai"
Every request returns "API Error: Rate limit reached" despite zero usage. Fresh auth login restores correct scopes but rateLimitTier does not correct to default_claude_pro.

What Should Happen?

After authenticating with a valid Claude Pro subscription via claude auth login, the rateLimitTier field in .credentials.json should be set to "default_claude_pro". Requests to Claude Code should succeed within Pro plan quota limits. Instead, rateLimitTier is set to "default_claude_ai" (the free tier), causing every request to return "API Error: Rate limit reached" despite zero actual usage and a valid paid subscription.

Error Messages/Logs

Steps to Reproduce

1. Have an active Claude Pro subscription on a Windows machine
2. Install Claude Code VS Code extension
3. Run claude auth login — browser OAuth completes successfully
4. Check ~/.claude/.credentials.json — rateLimitTier is set to "default_claude_ai" instead of "default_claude_pro"
5. Attempt any request in Claude Code (VS Code or CLI) — immediately returns "API Error: Rate limit reached"
6. Verify on claude.ai that subscription is active and usage is at or near zero
7. Run claude logout, delete .credentials.json, repeat claude auth login — same wrong tier assigned on every fresh login

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.87 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_