Configure fallbackModel chains so overloaded-primary errors auto-retry on a backup model

Claude Code Docs·medium signal

Week 24 lets you set fallbackModel (or --fallback-model, now also for interactive sessions) to a chain of up to three models tried in order when the primary is overloaded or unavailable. This turns a hard 'model overloaded' failure into a transparent degrade-and-continue, which matters for unattended/cron-driven agent runs that otherwise die on capacity blips. Pin a cheaper or different-provider model as the last link to guarantee the run finishes.