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8484The [`opusplan` model setting](/docs/en/model-config#opusplan-model-setting) resolves to Opus during plan mode and Sonnet during execution, so each plan-mode toggle is a model switch and starts a fresh cache.
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86[Automatic model fallback](/docs/en/model-config#automatic-model-fallback) on Fable 5 and Opus 5 is also a model switch. When a safety classifier flags a request and the flagged category has a fallback model, Claude Code re-runs the request on that model and the session continues there.
86[Automatic model fallback](/docs/en/model-config#automatic-model-fallback) on Fable 5.1, Fable 5, and Opus 5 is also a model switch. When a safety classifier flags a request and the flagged category has a fallback model, Claude Code re-runs the request on that model and the session continues there.
8787
8888### Changing effort level
8989