# Claude Opus 5.5 vs Claude Sonnet 5.5

Every finance benchmark where both have a score (Anthropic and Anthropic). Data refreshed 2 Nov 2026. Scores from different benchmarks use different scales and are not added up.

| Benchmark | Metric | Claude Opus 5.5 | Claude Opus 5.5 source | Claude Sonnet 5.5 | Claude Sonnet 5.5 source | Ahead |
| --- | --- | --- | --- | --- | --- | --- |
| Excel Modeling Benchmark (EMB) | accuracy % (v1.1) (higher is better) | 75.8 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/emb-v1-1 | 75.9 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/emb-v1-1 | Claude Sonnet 5.5 |
| Finance Agent Benchmark | Partial Credit accuracy % (v2.1) (higher is better) | 67.8 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/fabv2-1 | 67.3 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/fabv2-1 | Claude Opus 5.5 |
| Vals Finance Index | index accuracy % (higher is better) | 65.6 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/finance_index | 64.5 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/finance_index | Claude Opus 5.5 |
| Tax Agent Bench | accuracy % (all-pass x citation factor) (higher is better) | 45.6 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/tax_agent_bench | 42.0 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/tax_agent_bench | Claude Opus 5.5 |

Source: https://benchmarks.finance/compare/claude-opus-5-5-vs-claude-sonnet-5-5/

Created and maintained by Moneda.