Model comparison
Hunyuan Vision 1.5 vs Step 3.5 Flash
Hunyuan Vision 1.5 and Step 3.5 Flash score almost the same on the Noometry Index (42.6 vs 41.7), so choose on price, context window or the category you care about most.
Last verified . 8 shared benchmarks.
Tencent
StepFunSummary
- They share 8 benchmarks with published results for both. Hunyuan Vision 1.5 scores higher in 4 categories and Step 3.5 Flash in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Hunyuan Vision 1.5 leads 27.8 to 21.2.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Hunyuan Vision 1.5 | Step 3.5 Flash | |
|---|---|---|
| Provider | Tencent | StepFun |
| Noometry Index | 42.6 | 41.7 |
| Released | — | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 9 | 19 |
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Category by category
Coding Too close to call
Hunyuan Vision 1.5: 41.2 (#119), Step 3.5 Flash: 41.7 (#106)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1419 | 1436 |
Reasoning Hunyuan Vision 1.5 leads
Hunyuan Vision 1.5: 27.8 (#96), Step 3.5 Flash: 21.2 (#202)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1417 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Not comparable
Hunyuan Vision 1.5: —, Step 3.5 Flash: 40.6 (#77)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 66.8% |
| LMArena Math | — | 1408 |
Knowledge Not comparable
Hunyuan Vision 1.5: —, Step 3.5 Flash: 39.0 (#127)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | — | 1422 |
Multimodal Not comparable
Hunyuan Vision 1.5: 35.1 (#78), Step 3.5 Flash: —
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1180 | — |
Multilingual Too close to call
Hunyuan Vision 1.5: 50.5 (#118), Step 3.5 Flash: 50.7 (#115)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1383 | 1386 |
| LMArena Chinese | — | 1448 |
| LMArena French | — | 1421 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1353 |
| LMArena Korean | — | 1350 |
| LMArena Russian | — | 1385 |
| LMArena Spanish | — | 1419 |
Instruction Following Too close to call
Hunyuan Vision 1.5: 73.9 (#110), Step 3.5 Flash: 73.3 (#119)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1398 | 1385 |
Long Context Too close to call
Hunyuan Vision 1.5: 42.9 (#110), Step 3.5 Flash: 42.8 (#112)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1405 | 1402 |
Writing & Preference Hunyuan Vision 1.5 leads
Hunyuan Vision 1.5: 60.4 (#95), Step 3.5 Flash: 59.0 (#108)
| Benchmark | Hunyuan Vision 1.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1407 | 1403 |
| LMArena Creative Writing | 1389 | 1357 |
| LMArena Multi-Turn | 1423 | 1405 |
Frequently asked questions
Is Hunyuan Vision 1.5 better than Step 3.5 Flash?
Hunyuan Vision 1.5 and Step 3.5 Flash score almost the same on the Noometry Index (42.6 vs 41.7), so choose on price, context window or the category you care about most.
Is Hunyuan Vision 1.5 or Step 3.5 Flash better for coding?
They score almost the same on coding (41.2 vs 41.7); test both on your own repository before choosing.
How many benchmarks do Hunyuan Vision 1.5 and Step 3.5 Flash share?
8 benchmarks have published results for both models. Hunyuan Vision 1.5 has 9 scored results on Noometry and Step 3.5 Flash has 19.