Claude Fable 5.1 vs Claude Opus 5 in finance

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

Shared benchmarks
2
Claude Fable 5.1 only
2
Claude Opus 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 Opus 5

  • MortgageTax accuracy %, higher is better

    Claude Fable 5.1:70.8
    Claude Opus 5:72.1 (better)

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

    Claude Fable 5.1:49.2 (better)
    Claude Opus 5:45.5
Benchmark
Claude Fable 5.1
Claude Opus 5

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

MortgageTaxaccuracy %, higher is better
70.8
Vals.ai MortgageTax leaderboard (Official board, 1 Sept 2026)
72.1
Vals.ai MortgageTax leaderboard (Official board, 1 Sept 2026)
Tax Agent Benchaccuracy % (all-pass x citation factor), higher is better
49.2
Vals.ai leaderboard (Official board, 29 Oct 2026)
45.5
Vals.ai leaderboard (Official board, 29 Oct 2026)
Ramp Accounting Benchmean reward % (criteria, mean of 3 attempts), higher is better
49.7
Ramp Labs Accounting Bench (Official board, 2 Sept 2026)
Not scored
τ³-Bankingpass^1 %, higher is better
Not scored
48.7
τ-bench leaderboard (Sierra) (Official board, 4 Aug 2026)
CorpFin v2accuracy %, higher is better
Not scored
73.2
Vals.ai leaderboard (archived) (Official board, 12 Aug 2026)
Excel Modeling Benchmark (EMB)accuracy % (v1.1), higher is better
76.7
Vals.ai leaderboard (Official board, 29 Oct 2026)
Not scored

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