// AI news · 2026-11-10 · Zapier Blog
Claude Mythos vs Fable: Security and Capabilities
Anthropic released Claude Mythos due to severe cybersecurity risks, limiting public access and deploying it through Project Glasswing with major tech firms.
Published 2026-11-10 12:00 (Beijing time)Source Zapier BlogAuto-summarised, fact-checked against source
01Summary
A restricted version, Claude Fable, was briefly made public before access was suspended for foreign nationals. Both Mythos 5.2 and Fable 5.2 are designed for complex tasks like coding and research, with Fable featuring guardrails that block sensitive topics and auto-redirect to Opus when triggered.
Summarised from the original article by an open-source model, then checked automatically: every number and English name must appear in the source. The original article is authoritative.
02Key points
- Claude Mythos was withheld due to high cybersecurity risks and deployed via Project Glasswing.
- Fable includes guardrails blocking queries on security, chemistry, and biology, falling back to Opus if triggered.
- Mythos 5.2 and Fable 5.2 are optimized for complex tasks like software engineering and scientific research.
- Project Glasswing partners identified and patched over 10,000 critical security vulnerabilities.
03Source
What is Claude Mythos? And how is if different from Claude Fable?
Zapier Blog · published 2026-11-10 12:00 Beijing time
Also reported by 7 other outlets
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