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AIQuiet 10d · day 10

Anthropic's Mythos 5.5 appears in website source code

A model designation for what may be an unreleased AI system surfaced in HTML metadata on Anthropic's site.

newest coverage 10d agosummary written 10d ago2 pieces513 likes & upvotes54 comments XHacker News

What to know

  • A model designation "Mythos 5.5" was found in HTML source code on Anthropic's website, reported via social media on November 1, 2026.
  • The finding comes from an anonymous tip and has not been confirmed or commented on by Anthropic.
  • The designation suggests a potential unreleased or in-development AI model, but its purpose and status remain unclear.

Anthropic AI company

Anthropic's Mythos 5.5 appears in website source code
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How it unfolded 1 development · click the chart to see its coverage posts

Peak 1 piece in 3h at Nov 1, 9 AM; 2 pieces over 11 days (2 posts) Nov 1, 9 AM — 1 piece · 1 post — X 1Nov 1, 12 PM — 1 piece · 1 post — Hacker News 1Nov 1, 3 PM — quietNov 1, 6 PM — quietNov 1, 9 PM — quietNov 2, 12 AM — quietNov 2, 3 AM — quietNov 2, 6 AM — quietNov 2, 9 AM — quietNov 2, 12 PM — quietNov 2, 3 PM — quietNov 2, 6 PM — quietNov 2, 9 PM — quietNov 3, 12 AM — quietNov 3, 3 AM — quietNov 3, 6 AM — quietNov 3, 9 AM — quietNov 3, 12 PM — quietNov 3, 3 PM — quietNov 3, 6 PM — quietNov 3, 9 PM — quietNov 4, 12 AM — quietNov 4, 3 AM — quietNov 4, 6 AM — quietNov 4, 9 AM — quietNov 4, 12 PM — quietNov 4, 3 PM — quietNov 4, 6 PM — quietNov 4, 9 PM — quietNov 5, 12 AM — quietNov 5, 3 AM — quietNov 5, 6 AM — quietNov 5, 9 AM — quietNov 5, 12 PM — quietNov 5, 3 PM — quietNov 5, 6 PM — quietNov 5, 9 PM — quietNov 6, 12 AM — quietNov 6, 3 AM — quietNov 6, 6 AM — quietNov 6, 9 AM — quietNov 6, 12 PM — quietNov 6, 3 PM — quietNov 6, 6 PM — quietNov 6, 9 PM — quietNov 7, 12 AM — quietNov 7, 3 AM — quietNov 7, 6 AM — quietNov 7, 9 AM — quietNov 7, 12 PM — quietNov 7, 3 PM — quietNov 7, 6 PM — quietNov 7, 9 PM — quietNov 8, 12 AM — quietNov 8, 3 AM — quietNov 8, 6 AM — quietNov 8, 9 AM — quietNov 8, 12 PM — quietNov 8, 3 PM — quietNov 8, 6 PM — quietNov 8, 9 PM — quietNov 9, 12 AM — quietNov 9, 3 AM — quietNov 9, 6 AM — quietNov 9, 9 AM — quietNov 9, 12 PM — quietNov 9, 3 PM — quietNov 9, 6 PM — quietNov 9, 9 PM — quietYesterday, 12 AM — quietYesterday, 3 AM — quietYesterday, 6 AM — quietYesterday, 9 AM — quietYesterday, 12 PM — quietYesterday, 3 PM — quietYesterday, 6 PM — quietYesterday, 9 PM — quietToday, 12 AM — quietToday, 3 AM — quietToday, 6 AM — quietToday, 9 AM — quietToday, 12 PM — quietToday, 3 PM — quietToday, 6 PM — quiet 1
Nov 2Nov 3Nov 4Nov 5Nov 6Nov 7Nov 8Nov 9yesterdaynow · 9:50 PM ET
  1. 1
    “Mythos 5.5 is already listed HTML source code of Anthropic's official website…”
    — @kimmonismus

    • Mythos 5.5 is already listed HTML source code of Anthropic's official website Thanks to the anonymous person who sent me the tip via email :)

      @kimmonismusX10d ago512▲view on X ↗