The latest update to Claude Code, covering versions v2.1.142 through v2.1.143, introduces critical performance and workflow optimizations. The most notable change is the migration of Fast mode to the Opus 4.7 model as the default setting.
By leveraging Opus 4.7, Fast mode now delivers significantly faster output latency while maintaining exceptional reasoning capabilities. For developers who require deterministic behavior in CI environments, the update provides the flexibility to pin the tool to the older 4.6 model via an environment variable.
Furthermore, the update enhances the stability of the development environment by enforcing plugin dependencies. The system now automatically prevents the disabling of essential plugins that others rely on and manages transitive dependencies seamlessly. macOS users will also find improved background session handling, marking a major step forward in developer experience and tool reliability.
