Claude Mythos An independent archive
Claude Mythos is an independent, unofficial archive documenting Anthropic's frontier Claude model — codenamed Capybara. We consolidate public reporting, official Anthropic publications, and benchmark data, with clear sourcing and a strict separation of confirmed facts from speculation.
Why This Archive Exists
Mythos surfaced publicly through a CMS misconfiguration on March 26, 2026, and was officially released as Mythos Preview on April 8. Coverage scattered across Fortune, CNBC, CoinDesk, security blogs, and Anthropic's own materials. We built this site to consolidate that record into one searchable, source-linked, multilingual archive — useful to researchers, journalists, and anyone who wants to understand the model without sifting through fifty separate articles.
Who Runs This
Claude Mythos is run by independent contributors. We are not Anthropic employees, contractors, or affiliated partners, and have no insider access. Everything published here is sourced from publicly available reporting and Anthropic's own official publications — see our Methodology page for source-verification standards.
Our Relationship With Anthropic
None. This is an unofficial fan project with no affiliation, endorsement, sponsorship, or commercial relationship with Anthropic, PBC. All Anthropic names, logos, and product marks (including "Claude" and "Anthropic") are trademarks of Anthropic, PBC. We reference them under fair use for editorial and commentary purposes only.
How We Produce Content
Every claim is tagged: 🟢 confirmed (Anthropic official or major outlet) · 🟡 reported (single-source media) · 🔴 speculative (analytical inference). Primary sources are always linked and verifiable. For the full editorial process, see Methodology.
Contact & License
Editorial inquiries, source corrections, takedown requests: [email protected]. Original commentary and analysis on this site is licensed for non-commercial reuse with attribution. Data tables and benchmark figures are sourced from cited third parties — refer to those sources for their licensing terms.
Methodology →
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