# Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017

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

| Benchmark | Metric | Claude Sonnet 5.5 | Claude Sonnet 5.5 source | DeepSeek V4.1 Flash 1017 | DeepSeek V4.1 Flash 1017 source | Ahead |
| --- | --- | --- | --- | --- | --- | --- |
| Vals Finance Index | index accuracy % (higher is better) | 64.5 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/finance_index | 60.9 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/finance_index | Claude Sonnet 5.5 |
| Tax Agent Bench | accuracy % (all-pass x citation factor) (higher is better) | 42.0 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/tax_agent_bench | 44.4 | Vals.ai leaderboard, 29 Oct 2026, https://www.vals.ai/benchmarks/tax_agent_bench | DeepSeek V4.1 Flash 1017 |

Source: https://benchmarks.finance/compare/claude-sonnet-5-5-vs-deepseek-v4-1-flash-1017/

Created and maintained by Moneda.