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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 v2.1.9 15 Jan 2026

Opus 4.5 Upgrade Nudge

What

Users on older Opus 4.x models (Opus 4.0, 4.1) now see a notification suggesting they upgrade to Opus 4.5.

Details

Only shows for first-party users (claude.ai)
Displays: "Opus 4.5 is available and is our best model for coding"
Includes a hint to use /model command to upgrade
Nudge appears for ~10 seconds then dismisses

Evidence

vN9() at line 535826 (opus upgrade nudge, contains "opus-45-upgrade-nudge", "Opus 4.5 is available and is our best model for coding")

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

See this entry in the whole of v2.1.9 →