[BUG] Claude Code shows "Claude API" in banner instead of Max plan after login

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?

## Description

Claude Code v2.1.34 displays "Claude API" in the startup banner despite being authenticated with a Max plan subscription. This also
prevents /usage from working.

▐▛███▜▌ Claude Code v2.1.34
▝▜█████▛▘ Opus 4.6 · Claude API
▘▘ ▝▝ /Users/...

Expected: Opus 4.6 · Max plan

## Environment

• Claude Code v2.1.34
• macOS (Darwin 25.2.0, Apple Silicon)
• Max plan subscriber

## What I've tried

• claude logout && claude login (multiple times)
• Verified no ANTHROPIC_API_KEY env var is set
• No stale API key in shell configs, nix config, or anywhere on the system
• Was working correctly ~2 days ago in v2.1.32 with no config changes on my end

## Observations

• No ~/.claude/.credentials.json file is created after login
• No macOS keychain entry for "Claude Code" exists
• Authentication itself works fine (sessions function normally)
• Only the auth detection/display appears broken, causing the banner to show "Claude API" and /usage to not work

What Should Happen?

After logging in with a Max plan subscription, the startup banner should display the plan type (e.g. "Opus 4.6 · Max plan") rather than
"Claude API". The /usage command should also work correctly.

Error Messages/Logs

Error messages/logs:

No error messages during login — the OAuth flow appears to complete successfully.

After login:

  - `~/.claude/.credentials.json` does not exist
  - Claude API listed in header rather than Max Plan

Steps to Reproduce

Steps to reproduce:

1. Have a Max plan subscription
2. Run /logout
3. Run /login and complete the OAuth flow in the browser
4. Launch a new session with claude
5. Observe the startup banner shows "Opus 4.6 · Claude API" instead of the Max plan
6. Run /usage — it doesn't work (presumably because it thinks I'm on API billing)

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

v2.1.32

Claude Code Version

2.1.34

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_