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Full Fathom Five: The context of Anthropic’s Mythos-class public release
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Full Fathom Five: The context of Anthropic’s Mythos-class public release

Aikido commentary on Anthropic's public Claude Fable 5 release. The author says it is a Mythos-class model that routes cybersecurity prompts to Opus 4.8, so benchmarking its security capability is pointless. Mythos Preview and Claude Mythos 5 stay limited to Glasswing and about 150 additional organizations. The post argues that vulnerability discovery is roughly 20% of the problem and that zero-day demand is not supply-constrained (about 30 new vulns a month, citing Resecurity). It also argues that CVE and CISA KEV-centric prioritisation is fading, and that AI tokens will mostly go to defensive scanning, exposure management and remediation rather than attacker scans.

TL;DR Aikido's take on Claude Fable 5: cyber queries are routed to Opus 4.8, zero-day demand isn't supply-limited, and AI tokens will mostly fund defense and exposure management rather than attacks.
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Organisations named here

  • Claude Mythos 5
  • Patch Tuesday
  • Resecurity

Technologies named here

  • Glasswing initiative
  • Claude Fable 5
  • Claude Mythos Preview
  • Aikido autonomous pentesting
  • Claude Mythos 5
  • CISA KEV catalog
  • Claude Opus 4.8
  • CVSS
  • Resecurity research
  • Microsoft Patch Tuesday
  • Anthropic
  • Aikido Security
  • CISA KEV
  • Mythos
  • Project Glasswing
  • Fable 5
  • Opus 4.8

Techniques named here

  • IDOR discovery
  • Business logic flaw discovery
  • Social engineering as attackers' preferred method
  • Exposure management
  • Defensive scans and remediation workflows
  • Autonomous pentesting
  • IDOR

Threat actors named here

  • ShinyHunters
  • TeamPCP

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