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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.223

Model switches invalidate the cached prewarm entry

You'll notice
Useful3 Signal0
Models

Switching models now throws away prewarm work done for the old model instead of finishing it stale.

What

Changing models now discards any precomputed prewarm work tied to the previous model instead of letting it complete against stale state.

Details
  • Both the app-state model change handler and the remote model-switch path call the precompute-cache invalidator with the reason model_switch.
  • Any in-flight prewarm is aborted with an AbortError named for that reason.
  • Same mechanism previously used only for subagent_exit.
Evidence

l_t(void 0, "model_switch")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →