{"slug": "claude-fable-5-1-results-on-arc-agi", "title": "Claude Fable 5.1 results on ARC-AGI", "summary": "Anthropic's Claude Fable 5.1 scores 97.5% on ARC-AGI-1 Semi-Private at $1.40 per task and 90.0% on ARC-AGI-2 Semi-Private at $4.49 per task at max effort, according to results published by Anthropic on Sep 1, 2026. The model's performance degrades with lower reasoning effort, dropping to 90.0% on ARC-AGI-1 and 78.3% on ARC-AGI-2 at the Low variant.", "body_md": "# Claude Fable 5.1\n\nAnthropic·Sep 1, 2026·5 reasoning variants\n\nAt max effort, Claude Fable 5.1 scores 97.5% on ARC-AGI-1 Semi-Private at $1.40 per task and 90.0% on ARC-AGI-2 Semi-Private at $4.49 per task.\n\n## ARC-AGI 2 leaderboard\n\nClaude Fable 5.1\n\n## Verified scores\n\n| Variant | ARC-AGI-1 | ARC-AGI-2 | ARC-AGI-3 |\n|---|---|---|---|\n| Max | 97.5% | 90.0% | — |\n| XHigh | 96.5% | 90.0% | — |\n| High | 96.0% | 88.8% | — |\n| Medium | 94.5% | 86.3% | — |\n| Low | 90.0% | 78.3% | — |\n\n## Tasks & environments\n\nPass/fail per reasoning level across each benchmark.\n\n### ARC-AGI-2 Public Eval\n\n120 tasks| Task | Max | XHigh | High | Medium | Low |\n|---|---|---|---|---|---|\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✗ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✗ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✗ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✗ | ✗ | ✓ | ✗ | ✗ | |\n| ✗ | ✗ | ✗ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✗ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✗ | ✗ | ✗ | |\n| ✓ | ✓ | ✗ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✗ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✗ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✗ | ✓ | ✗ | |\n| ✓ | ✓ | ✗ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ |\n\n### ARC-AGI-1 Public Eval\n\n400 tasks| Task | Max | XHigh | High | Medium | Low |\n|---|---|---|---|---|---|\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✗ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✗ | ✗ | ✗ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ 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| ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✗ | ✗ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✗ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✓ | ✓ | |\n| ✓ | ✓ | ✓ | ✗ | ✓ |", "url": "https://wpnews.pro/news/claude-fable-5-1-results-on-arc-agi", "canonical_source": "https://arcprize.org/results/anthropic-claude-fable-5-1", "published_at": "2026-09-01 21:05:25+00:00", "updated_at": "2026-09-01 21:22:52.163076+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-research", "ai-products"], "entities": ["Anthropic", "Claude Fable 5.1", "ARC-AGI-1", "ARC-AGI-2", "ARC-AGI-3"], "alternates": {"html": "https://wpnews.pro/news/claude-fable-5-1-results-on-arc-agi", "markdown": "https://wpnews.pro/news/claude-fable-5-1-results-on-arc-agi.md", "text": "https://wpnews.pro/news/claude-fable-5-1-results-on-arc-agi.txt", "jsonld": "https://wpnews.pro/news/claude-fable-5-1-results-on-arc-agi.jsonld"}}