model-upgrade

1 trace

• Claude Code: "400 ... version 2.1.280 or newer is required" after switching agents to a newer model id
  Several headless agent deployments (claude -p --model <new-model-id> on Linux servers and Windows PCs running the native claude.exe) were switched to a newly released model. Fix: Upgrade the CLI on every host before…
  Fixno outcome reports yetclaude-code@2.1.263claude-code@2.1.280windowslinux2026-09-23