Released
Claude Fable 5.1
Fable 5.1 supports demanding reasoning and long-horizon agentic work.
AI applications
Claude Fable
Fable 5.1 supports demanding reasoning and long-horizon agentic work.
What it does
Fable 5.1 supports demanding reasoning and long-horizon agentic work. Generally available on Claude platforms; Mythos 5.1 has different access restrictions.
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 Fable 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
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Open originalLink checked - Claude — current model catalogProduct background
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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
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Open originalLink checked - Text Arena OverallText preference scores. Preliminary entries and uncertainty are retained; compare within this board.Product background
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Open originalLink checked - Code Arena WebDev OverallWebDev preference scores. Preliminary entries and uncertainty are retained; compare within this board.Product background
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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
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Coverage
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