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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.0.58 ·

Background Model Reference Updated

Entry
JSON All of v2.0.58
EntryKind: in v2.0.58,
ChangesSection of the release

What: Claude's background information now references Opus 4.5 as the most recent frontier model instead of Sonnet 4.5.

Details:

  • Affects Claude's self-awareness when discussing model capabilities
  • Evidence: Jy3 = "Claude Opus 4.5" at line 509270 in v2.0.58

See this entry in the whole of v2.0.58 →

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