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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 v2.1.66

Model Update Notification

The model migration notification has changed from "Model updated to Opus 4.6" to "Model updated to Opus 4.5", reflecting changes in default model availability for certain account types.

Evidence

Model migration notification (search for "Model updated to Opus 4.5")

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 v2.1.66 →