What
Print mode is the way of running Claude Code non-interactively to get a single answer. In print mode, a model override can be adopted during a session. At the end of each turn (one round of request and reply), the logic that decides whether to adopt that override now compares against the model that was active when the turn started. Before, only the override at the start of the turn was recorded.
Usage reporting for this decision also gains a field, override_same_at_both_ends.
Why
This addresses an edge case where the model is switched partway through a session, so the model choice at the end of a turn takes into account what was in use when the turn began.
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The exact new rules for when an override is adopted are not shown.