Model comparison
DeepSeek V4.1 Flash vs Hy4 preview
DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 45.3 on the Noometry Index.
Last verified . 3 shared benchmarks.
DeepSeek
TencentSummary
- They share 3 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 3 categories and Hy4 preview in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where DeepSeek V4.1 Flash leads 50.2 to 31.9.
- The biggest single-benchmark swing is NYT Connections (extended): 89.6% for DeepSeek V4.1 Flash and 68.2% for Hy4 preview.
- DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $0.75 / $2.25 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 1M.
Side by side
| DeepSeek V4.1 Flash | Hy4 preview | |
|---|---|---|
| Provider | DeepSeek | Tencent |
| Noometry Index | 52.8 | 45.3 |
| Released | 2026-09-09 | 2026-08-28 |
| Weights | Open | Open |
| Context window | 1M | 1.05M |
| Max output | 393K | 64K |
| Input $ / M tokens | $0.15 | $0.75 |
| Output $ / M tokens | $0.60 | $2.25 |
| Results tracked | 37 | 3 |
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Category by category
Coding DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 52.9 (#32), Hy4 preview: 51.6 (#38)
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| LMArena WebDev | 1619 | 1632 |
| SciCode | 51.9% | — |
| LMArena Coding | 1506 | — |
| ALE-Bench | 1,092 | — |
Agentic & Tool Use Not comparable
DeepSeek V4.1 Flash: 31.2 (#69), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| APEX-Agents | 39.5% | — |
| GDP.pdf | 19.8% | — |
Reasoning DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 50.2 (#36), Hy4 preview: 31.9 (#79)
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | 89.6% | 68.2% |
| CritPt | 14.3% | — |
| LMArena Hard Prompts | 1483 | — |
| Mystery Game Puzzles | 43% | — |
| DTBench | 89.9% | — |
| LMCA | 47% | — |
| Surface Evolver Bench | 46.3% | — |
| Epoch Capabilities Index | 154.9 | — |
Math DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 66.7 (#25), Hy4 preview: 55.7 (#42)
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| ProofBench | 54% | 75% |
| FrontierMath (Tiers 1-3) | 67.4% | — |
| FrontierMath Tier 4 | 26.8% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| LMArena Math | 1477 | — |
Knowledge Not comparable
DeepSeek V4.1 Flash: 57.9 (#38), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| GPQA Diamond | 89.8% | — |
| LMArena Expert | 1506 | — |
Multimodal Not comparable
DeepSeek V4.1 Flash: 39.1 (#61), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| LMArena Vision | 1277 | — |
| Furniture Assembly | 34.2% | — |
Multilingual Not comparable
DeepSeek V4.1 Flash: 55.0 (#35), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| 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
DeepSeek V4.1 Flash: 77.3 (#26), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1474 | — |
Long Context Not comparable
DeepSeek V4.1 Flash: 45.2 (#47), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1475 | — |
Writing & Preference Not comparable
DeepSeek V4.1 Flash: 65.4 (#48), Hy4 preview: —
| Benchmark | DeepSeek V4.1 Flash | Hy4 preview |
|---|---|---|
| LMArena Text | 1462 | — |
| LMArena Creative Writing | 1435 | — |
| EQ-Bench Creative Writing | 1540 | — |
| LMArena Multi-Turn | 1457 | — |
Frequently asked questions
Is DeepSeek V4.1 Flash better than Hy4 preview?
DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 45.3 on the Noometry Index.
Which is cheaper, DeepSeek V4.1 Flash or Hy4 preview?
DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Hy4 preview lists at $0.75 and $2.25.
Is DeepSeek V4.1 Flash or Hy4 preview better for coding?
DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.9 versus 51.6 in the Noometry coding category.
Which has the bigger context window?
Hy4 preview does, with 1.05M tokens against 1M.
How many benchmarks do DeepSeek V4.1 Flash and Hy4 preview share?
3 benchmarks have published results for both models. DeepSeek V4.1 Flash has 37 scored results on Noometry and Hy4 preview has 3.