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July 10, 2026 · Anthropic

Dreams research preview adds Claude Fable 5 and Claude Sonnet 5 support

  • Dreams (research preview) now supports Claude Fable 5 and Claude Sonnet 5. See Supported models.
  • We’ve expanded the Access Transparency documentation of cmek_preserve events with a filter example, an example event payload, and two preservation reason codes (policy_violation_investigation, csae_report). The documentation now also clarifies that a preservation event is written whether the preservation was initiated by a human reviewer or an automated safety pipeline. See CMEK content preservation.
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