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Anthropic releases Claude Sonnet 4.5

On September 29, 2025, Anthropic announced Claude Sonnet 4.5 with updates spanning coding, agents, and computer use.

"Anthropic launches Claude 4.5, touts better abilities, targets business customers." — Reuters (Sep 29, 2025)

Supporting data

  • Official announcement — Anthropic
  • Computer-use benchmark and focus duration reported — TechRadar

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