[BUG] Desktop App Billing Sync Blocking Time-Limited Fable Evaluation - Pro Subscriber Cannot Access

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?

Summary

I purchased Claude Pro specifically to evaluate Fable (latest Mythos model) during its limited availability window. The desktop app has a billing sync bug preventing access, and support is non-responsive. I'm losing the evaluation window due to Anthropic's system failure.

Issue

• Pro subscription purchased: June 10, 2026
• Pro Plan confirmed active on claude.ai: YES
• Desktop app error: "Your credit balance is too low to access the Anthropic API"
• Error code: HTTP 400, responseBody shows insufficient credits despite active subscription

What I've Tried

• Signed out/restarted desktop app multiple times
• Cleared app cache
• Used "Interactive signin" (only auth option available)
• Contacted support via support.anthropic.com chat: 12+ hours, no response
• Contacted support via in-app messenger: 12+ hours, no response
• Emailed support@anthropic.com: 24+ hours, no response

Why This Is Critical

• Fable is available for a LIMITED TIME ONLY
• The desktop app is required for my workflow (C++ compilation + WinDbg debugging)
• Evaluation window is CLOSING
• I paid for access to a time-limited feature that is now inaccessible due to a known backend sync bug

What I Need

Manual account sync or immediate technical fix so desktop app recognizes my active Pro subscription.

Error Details

message: Anthropic API rejected model "claude-haiku-4-5-20251001" (HTTP 400)
responseBody: {"type":"error","error":{"type":"invalid_request_error","message":"Your credit balance is too low to access the Anthropic API. Please go to Plans & Billing to upgrade or purchase credits."}

What Should Happen?

I hope to get access to the Claude Desktop app.

Error Messages/Logs

Steps to Reproduce

n/a

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

latest

Platform

Anthropic API

Operating System

Windows 11

Terminal/Shell

Terminal.app

Additional Information

_No response_