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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 v2.0.51 24 Nov 2025

Extra Usage Integration Enhanced

The extra usage feature now has deeper integration with account state and re-authentication flows.

Added hasExtraUsageEnabled account property tracked via OAuth
/extra-usage command now triggers re-authentication to sync state
Pro users with extra usage enabled get access to Opus features
Evidence: Account property at DC1() line 67554, API mapping at line 67521

See this entry in the whole of v2.0.51 →