Claude Code 2.1.278 changes Auto Mode for Claude API, Enterprise, and Bedrock/Vertex/Foundry/gateway users to default to the server-side classifier, which does not charge classifier overhead. Set CLAUDE_CODE_AUTO_MODE_SERVER=0 to opt out on gateways; billed fallback warns. /status adds an Auto mode server row for the session.

Key Takeaways

  • ✓Auto Mode defaults to the server-side classifier with no classifier overhead; gateways can opt out via CLAUDE_CODE_AUTO_MODE_SERVER=0.
  • ✓Warns on billed fallback; see code.claude.com/docs/en/auto-mode-classifier-billing.
  • ✓/status shows Auto mode server; notes at github.com/anthropics/claude-code/releases/tag/v2.1.278.
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