Claude Code v2.1.166 Introduces Fallback Model Settings for Enhanced Resilience

Core summary

One sentence to understand this update

Claude Code v2.1.166 has been released, adding a `fallbackModel` setting that allows configuring up to three fallback models for improved resilience when the primary model is overloaded or unavailable, also applicable to interactive sessions.

Impact & opportunity

What this could mean

Developers using Claude Code can now build more robust applications with automatic failover to alternative models, improving reliability and user experience.