[BUG] CLAUDE_CODE_OAUTH_TOKEN ignored when `claude --print`

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: Since 1.0.67
• Operating System: Linux c956dfb691a7 6.14.10-orbstack-00291 aarch64 GNU/Linux
• Terminal: xterm-256color

Bug Description

When headless claude --print
And CLAUDE_CODE_OAUTH_TOKEN set in environment
Or present in $HOME/.claude/.credentials.json
Then authenticate with OAuth token
And ignore ANTHROPIC_API_KEY

Steps to Reproduce

# Remove ANTHROPIC_API_KEY
unset ANTHROPIC_API_KEY; 

# Install 1.0.68 (latest as of 5 August)
npm install -g @anthropic-ai/claude-code@1.0.68; 

claude --version # 1.0.68 (Claude Code)

# Simple test asserts OAuth token usage
echo "ping" | CLAUDE_CODE_OAUTH_TOKEN=$(cat $HOME/.claude/.credentials.json | jq -r '.claudeAiOauth.accessToken') claude -p # Credit balance is too low

Expected Behavior

When headless claude --print
And CLAUDE_CODE_OAUTH_TOKEN set in environment
Or present in $HOME/.claude/.credentials.json
Then authenticate with OAuth token
And ignore ANTHROPIC_API_KEY

Actual Behavior

CLAUDE_CODE_OAUTH_TOKEN is ignored; falls back to ANTHROPIC_API_KEY if present in environment.

Additional Context

Last known good version 1.0.66
Claude Max Subscription (paid to September 2025)