Expired50% confidenceFactTime unknown
Mythos is Anthropic's next-phase flagship product line, comprising Mythos Docs and a model codenamed 'Copybara'.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Claude Code Source Code Leak: Full Roadmap for Opus 4.7 and Mythos 5 Exposed
bilibiliAI-seeker
Related Claims
UnverifiedAnthropic is internally red-teaming a new model codenamed 'Oceanus,' which is considered the successor to Mythos Preview.66% similarUnverifiedClaude Mythos is a new development from Anthropic, possibly a new branch or experimental project within the Claude product line.64% similarUnverifiedOceanus is believed to be the successor to the current Mythos Preview model63% similarUnverifiedAnthropic released Claude Mythos in April 2026.63% similarUnverifiedAnthropic's Fable 5 has the internal codename Mythos 5 and is its frontier research-grade model.63% similar
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