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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 v2.1.51 23 Feb 2026

Model Selector Version Hints

When selecting a model in the CLI, if you have a pinned older model version (e.g., claude-sonnet-4-5), the selector now shows a helpful hint like "Newer version available · select Sonnet for claude-sonnet-4-6", guiding you to the latest version.

Evidence

Function o_z returns description: "Newer version available · select ${alias} for ${currentVersionName}" (search for "Newer version available")

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

See this entry in the whole of v2.1.51 →