Machine Heart
Jun 12, 2026 · Artificial Intelligence
Claude Fable 5 Scores Zero on ALE’s Hardest Tier – Insights from the Final Agent Exam
Claude Fable 5 tops the Agent Arena leaderboard but fails completely on the most difficult ALE tasks, highlighting higher costs, zero pass rates on the hardest tier, and the broader challenges still facing generalist computer‑use agents.
AI agent benchmarksAgents' Last ExamClaude Fable 5
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