Model comparison
Claude 2.1 vs DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 25.2 on the Noometry Index.
Last verified . 4 shared benchmarks.
DeepSeekSummary
- They share 4 benchmarks with published results for both. Claude 2.1 scores higher in 0 categories and DeepSeek V4.1 Flash in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where DeepSeek V4.1 Flash leads 66.7 to 10.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.9% for Claude 2.1 and 98.3% for DeepSeek V4.1 Flash.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.
Side by side
| Claude 2.1 | DeepSeek V4.1 Flash | |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 25.2 | 52.8 |
| Released | 2023-11-21 | 2026-09-09 |
| Weights | Proprietary | Open |
| Context window | — | 1M |
| Max output | — | 393K |
| Input $ / M tokens | — | $0.15 |
| Output $ / M tokens | — | $0.60 |
| Results tracked | 7 | 37 |
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Category by category
Coding DeepSeek V4.1 Flash leads
Claude 2.1: 26.2 (#327), DeepSeek V4.1 Flash: 52.9 (#32)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena WebDev | — | 1619 |
| SciCode | — | 51.9% |
| WeirdML | 7.1% | — |
| LMArena Coding | — | 1506 |
| ALE-Bench | — | 1,092 |
Agentic & Tool Use Not comparable
Claude 2.1: —, DeepSeek V4.1 Flash: 31.2 (#69)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| APEX-Agents | — | 39.5% |
| GDP.pdf | — | 19.8% |
Reasoning DeepSeek V4.1 Flash leads
Claude 2.1: 21.4 (#221), DeepSeek V4.1 Flash: 50.2 (#36)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| DTBench | 51% | 89.9% |
| Epoch Capabilities Index | 119.27 | 154.9 |
| NYT Connections (extended) | — | 89.6% |
| CritPt | — | 14.3% |
| LMArena Hard Prompts | — | 1483 |
| Mystery Game Puzzles | — | 43% |
| LMCA | — | 47% |
| Surface Evolver Bench | — | 46.3% |
| ForecastBench | 54.2 | — |
Math DeepSeek V4.1 Flash leads
Claude 2.1: 10.2 (#315), DeepSeek V4.1 Flash: 66.7 (#25)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | 98.3% |
| FrontierMath (Tiers 1-3) | — | 67.4% |
| FrontierMath Tier 4 | — | 26.8% |
| ProofBench | — | 54% |
| LMArena Math | — | 1477 |
Knowledge DeepSeek V4.1 Flash leads
Claude 2.1: 15.4 (#292), DeepSeek V4.1 Flash: 57.9 (#38)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| GPQA Diamond | 33% | 89.8% |
| LMArena Expert | — | 1506 |
| MMLU | 73.5% | — |
Multimodal Not comparable
Claude 2.1: —, DeepSeek V4.1 Flash: 39.1 (#61)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Vision | — | 1277 |
| Furniture Assembly | — | 34.2% |
Multilingual Not comparable
Claude 2.1: —, DeepSeek V4.1 Flash: 55.0 (#35)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Non-English | — | 1448 |
| LMArena Chinese | — | 1497 |
| LMArena French | — | 1452 |
| LMArena German | — | 1484 |
| LMArena Japanese | — | 1412 |
| LMArena Korean | — | 1452 |
| LMArena Russian | — | 1471 |
| LMArena Spanish | — | 1459 |
Instruction Following Not comparable
Claude 2.1: —, DeepSeek V4.1 Flash: 77.3 (#26)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Instruction Following | — | 1474 |
Long Context Not comparable
Claude 2.1: —, DeepSeek V4.1 Flash: 45.2 (#47)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Longer Query | — | 1475 |
Writing & Preference Not comparable
Claude 2.1: —, DeepSeek V4.1 Flash: 65.4 (#48)
| Benchmark | Claude 2.1 | DeepSeek V4.1 Flash |
|---|---|---|
| LMArena Text | — | 1462 |
| LMArena Creative Writing | — | 1435 |
| EQ-Bench Creative Writing | — | 1540 |
| LMArena Multi-Turn | — | 1457 |
Frequently asked questions
Is Claude 2.1 better than DeepSeek V4.1 Flash?
DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 25.2 on the Noometry Index.
Is Claude 2.1 or DeepSeek V4.1 Flash better for coding?
DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.9 versus 26.2 in the Noometry coding category.
How many benchmarks do Claude 2.1 and DeepSeek V4.1 Flash share?
4 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and DeepSeek V4.1 Flash has 37.