Claude Fable 5.1 vs Claude Sonnet 5.5

Every finance benchmark where both have a score (Anthropic and Anthropic). Data refreshed 2 Nov 2026.

Shared benchmarks
2
Claude Fable 5.1 only
0
Claude Sonnet 5.5 only
2

Shared benchmarks, side by side

Each benchmark is drawn on its own scale. Bars are not comparable across rows.

  • Claude Fable 5.1
  • Claude Sonnet 5.5

  • Excel Modeling Benchmark (EMB) accuracy %, higher is better

    Claude Fable 5.1:76.7 (better)
    Claude Sonnet 5.5:75.9

  • Tax Agent Bench accuracy % (all-pass x citation factor), higher is better

    Claude Fable 5.1:49.2 (better)
    Claude Sonnet 5.5:42.0
Benchmark
Claude Fable 5.1
Claude Sonnet 5.5

4 benchmarks, 2 scored for both. Bold marks the better score where both have one.

Excel Modeling Benchmark (EMB)accuracy %, higher is better
76.7
Vals.ai leaderboard (Official board, 29 Oct 2026)
75.9
Vals.ai leaderboard (Official board, 29 Oct 2026)
Tax Agent Benchaccuracy % (all-pass x citation factor), higher is better
49.2
Vals.ai leaderboard (Official board, 29 Oct 2026)
42.0
Vals.ai leaderboard (Official board, 29 Oct 2026)
Finance Agent BenchmarkPartial Credit accuracy %, higher is better
Not scored
67.3
Vals.ai leaderboard (Official board, 29 Oct 2026)
Vals Finance Indexindex accuracy %, higher is better
Not scored
64.5
Vals.ai leaderboard (Official board, 29 Oct 2026)

Scores from different benchmarks use different scales and are not added up. Settings can differ between sources; see each leaderboard for details.