Claude Code v2.1.278

Released Sep 19, 2026 (26 days ago).

236 issues reference this build
191 still open
45 resolved (19%)

"References this build" means the issue body mentions running 2.1.278 (from the bug-report template). It reflects report volume, not a proven defect count — an issue may mention a version without being caused by it. First-party data from the anthropics/claude-code tracker.

Top issues reported on v2.1.278

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Changelog

What's changed

  • Changed auto mode for Claude API and Enterprise users, and on Bedrock, Vertex, Foundry and gateways, to default to the server-side classifier, which does not charge for classifier overhead (CLAUDE_CODE_AUTO_MODE_SERVER=0 opts out on Bedrock, Vertex, Foundry and gateways); warns on billed fallback. See https://code.claude.com/docs/en/auto-mode-classifier-billing
  • Added an Auto mode server row to /status showing whether this session's auto mode classifier runs on the server