[BUG] Native Windows installer uses wrong OAuth client ID for accounts with both Max subscription and Console org — always authenticates as Claude API instead of subscription

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?

Claude Code (native Windows installer) always authenticates via Claude API billing instead of the Max subscription, even after a clean /logout + /login cycle. The OAuth flow is sent to platform.claude.com with a Console client ID, not claude.ai.

The startup header reads: Opus 4.6 with high effort · Claude API · redacted@gmail.com's Organization

Running /status shows Auth token: CLAUDE_CODE_OAUTH_TOKEN but /usage reports: _"/usage is only available for subscription plans."_

Credentials in ~/.claude/.credentials.json correctly show subscriptionType: max and rateLimitTier: default_claude_max_5x — so the token itself is fine, but Claude Code treats the session as API-billed regardless.

Root cause identified

When /login is triggered, Claude Code opens the following OAuth URL:

https://platform.claude.com/oauth/authorize?code=true
  &client_id=9d1c250a-e61b-44d9-88ed-5944d1962f5e
  &redirect_uri=https%3A%2F%2Fplatform.claude.com%2Foauth%2Fcode%2Fcallback
  &scope=org%3Acreate_api_key+user%3Aprofile+user%3Ainference+...

The client_id=9d1c250a-e61b-44d9-88ed-5944d1962f5e belongs to the Claude Console / API platform, not to the claude.ai subscription OAuth app. The redirect URI also points to platform.claude.com.

Manually replacing both the base URL and redirect_uri to claude.ai fails with: _"Redirect URI https://claude.ai/oauth/code/callback is not supported by client."_ — confirming the client ID itself is registered only for Console redirect URIs.

The Console login page shown during the flow includes the hint banner _"Have a Pro or Max plan? Login with your chat account instead"_ — clicking it shows the correct claude.ai authorization screen, but then fails with _"Redirect URI https://platform.claude.com/oauth/code/callback is not supported by client."_

Hypothesis

When an account has both a claude.ai Max subscription and an Anthropic Console organization on the same email, the native Windows installer selects the Console OAuth client ID instead of the subscription client ID.

Workarounds attempted — none successful

• Clean /logout + /login
• Deleting ~/.claude.json and ~/.claude/.credentials.json
• Logging out of Console in the browser before authenticating
• Using an incognito window for the OAuth flow
• Manually modifying the OAuth URL domain and redirect_uri

What Should Happen?

Expected behavior

Claude Code should use the claude.ai OAuth client ID and redirect URI for accounts with an active Pro/Max subscription, regardless of whether the same account also has a Console org.

Error Messages/Logs

## Actual behavior

Claude Code always uses the Console OAuth client ID (`9d1c250a-e61b-44d9-88ed-5944d1962f5e`) and `platform.claude.com` redirect URI, resulting in API billing instead of subscription usage.

Steps to Reproduce

Steps to reproduce

1. Have an account with an active Claude Max subscription on claude.ai
2. Have the same account also linked to an Anthropic Console organization (API billing)
3. Install Claude Code using the native Windows installer
4. Run /logout then /login — observe the OAuth URL generated
5. Check that client_id in the URL is 9d1c250a-e61b-44d9-88ed-5944d1962f5e and base domain is platform.claude.com
6. Complete the auth flow — Claude Code header shows Claude API not subscription

At least that is the exact way for me and it just won't let me in.

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

2.1.84 (Claude Code)

Claude Code Version

2.1.84 (Claude Code)

Platform

Anthropic API

Operating System

Windows 11

Terminal/Shell

Windows Terminal

Additional Information

• No ANTHROPIC_API_KEY or ANTHROPIC_AUTH_TOKEN env vars set (verified at session, user, and machine level)
• No apiKey entries in settings.json or settings.local.json
• ~/.claude/.credentials.json shows correct subscriptionType: max after login
• ~/.claude.json showed "hasAvailableSubscription": false — clearing it did not fix the issue
• Claude Code version 2.1.84 with autoUpdates: false (native install)