Released
Claude Mythos 5.1
Mythos 5.1 shares the Fable 5.1 model with different safeguards and restricted access.
AI applications
Claude Mythos
Mythos 5.1 shares the Fable 5.1 model with different safeguards and restricted access.
What it does
Mythos 5.1 shares the Fable 5.1 model with different safeguards and restricted access. Available only through trusted access programs, initially to selected US organizations in cyberdefense and life sciences.
Who it’s for
Developers and researchers
Release timeline
1The releases collected here, ordered by announcement date. This is a selected history, not a complete changelog.
- vClaude Mythos 5.1
Community & launch discussions
Channels and community spaces provide product context. Linked discussions belong to the listed release; launch platform dates may differ from the official announcement.
No verified community resources collected yet.
Materials & reading
Official introductions, docs, demos and press kits. These describe the product unless a specific release is shown.
- Introducing Claude Fable 5.1 and Claude Mythos 5.1
Original page reviewed
Open originalLink checked - Artificial Analysis LLM Leaderboard · 4.3.2Intelligence Index v4.3.2. This is a checked snapshot; older method versions are not directly comparable.Product background
Original page reviewed
Open originalLink checked - Text Arena OverallText preference scores. Preliminary entries and uncertainty are retained; compare within this board.Product background
Original page reviewed
Open originalLink checked - Code Arena WebDev OverallWebDev preference scores. Preliminary entries and uncertainty are retained; compare within this board.Product background
Original page reviewed
Open originalLink checked - Agent Arena OverallAgent Arena measures Net Improvement, not task success rate. Scores depend on the listed configuration.Product background
Original page reviewed
Open originalLink checked - Task-Completion Time Horizons of Frontier AI Models · TH1.1TH1.1 task-completion time horizons. Model-specific chart values were not read; no scores are copied.Product background
Original page reviewed
Open originalLink checked
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Coverage
This timeline contains selected, reviewed releases. It is not a complete history.
No recent source-check information is available.
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