AI Radar

Claude Mythos Preview

Deprecated · Language, Reasoning

Claude Mythos Preview is a general-purpose model that Anthropic announced on 7 April 2026 with Project Glasswing, a defensive cybersecurity initiative. It was offered as an invitation-only research preview for Glasswing participants through the Claude API and major cloud platforms; Anthropic said it did not plan general availability and later called it the first Mythos-class model. [1] [2]April 7, 2026 [3] Primary source

Timeline of Claude Mythos Preview →

Claims and evidence

  • Announced Primary source[1]Introduction [2]April 7, 2026
  • Released Made available on this date as an invitation-only gated research preview for Project Glasswing participants, not as a general release. Primary source[2]April 7, 2026
  • Deprecated Primary source[4]Model status table
  • Status Deprecated Primary source[4]Model status table
  • Replaced by Claude Mythos 5 Primary source[5]Migrating from Claude Mythos Preview [3]
      • Parameters Not disclosedNot disclosed by Anthropic. No claim madeNo source
      • Access API, cloud partnerInvitation only, for Project Glasswing participants. Primary source[1]pricing and access paragraph

      Lineage

      Predecessors

      No known predecessor.

      Successors

      Based on

      Not derived from another model.

      Variants and derived

      None recorded.

      Siblings

      None recorded.

      All ancestors

      None.

      All descendants

      Variants

      No variants recorded in this record.

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