What
The launch model is the model a session starts with. In print and SDK sessions, which run Claude Code without the interactive screen, a set-model call can fail because the server refuses that model (serverRefusedModel). A new step, dropUnconfirmedLaunchModel, now discards the refused launch model if no turn has been sent yet. A turn is one exchange with the model.
dropUnconfirmedLaunchModeldiscards the refused launch model when no turn has been sent.- When that happens, Claude Code records a usage event that notes the surface the request came from and the error code.
refreshesClientDataOnSwitchis removed.- A
clientDataFetches.clear()reset call is added.
Why
This affects which model a print or SDK session ends up using after the server turns down the model it was launched with. A refused launch model is no longer kept around once the server has said no, as long as no work has been sent yet.
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It is not clear which model the session uses instead once the refused one is dropped.