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model

Claude Mythos Preview

Anthropic model described as analyzing source code and fuzzing binaries to find and chain vulnerabilities, available only to selected companies and researchers.

Known aliases

  • Claude Mythos
  • Claude Mythos 5
  • Claude Mythos Preview
  • Mythos-class
  • Mythos Preview
  • Мітос Прев'ю

Relationships

No evidence-backed relationships are recorded.

Current stories

build4 publishers

Anthropic says a freely downloadable model builds exploits nearly as well as its restricted tool

Anthropic says Zhipu's freely downloadable GLM-5.3 built working V8 exploits in 50 of 410 tries, against 56 for its own restricted Claude Mythos Preview. With the weights public, its safeguards come off cheaply, so a lab that restricts its own model no longer keeps the capability out of reach.

Perspective Coverage

4 publishers
Builder
Builder 41%
Operator
Operator 38%
Investor
Investor 21%

Reality

Evidence62
Adoption30
Hype gap+15
Incentives72
Confidence62
security1 publisher

Australian Signals Directorate tells AI customers to guard their own keys and sessions

Australia's Signals Directorate says attackers are using stolen AI API keys, tokens and hijacked sessions to get into organisations' AI services. Its guidance tells customers to protect those credentials themselves. In one reported case, a stolen key ran up about US$600,000 in model credits over three weeks.

Reality

Evidence45
Adoption
Insufficient
Hype gap+15
Incentives
Insufficient
Confidence50

Earlier coverage

  1. Claude's system prompt grew ninefold in two years. Version yours like code.

    Build · August 16, 2026 · 1 publisher

  2. The bug queue is about to invert: budget for reachability data, not patch throughput

    Security · August 14, 2026 · 1 publisher