Model comparison
Step 1o Turbo 202506 vs Step 3.5 Flash
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 39.7 on the Noometry Index.
Last verified . 13 shared benchmarks.
StepFunSummary
- They share 13 benchmarks with published results for both. Step 1o Turbo 202506 scores higher in 1 category and Step 3.5 Flash in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Step 3.5 Flash leads 42.6 to 36.6.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Step 1o Turbo 202506 | Step 3.5 Flash | |
|---|---|---|
| Provider | StepFun | StepFun |
| Noometry Index | 39.7 | 42.3 |
| 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 | 14 | 19 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Step 3.5 Flash leads
Step 1o Turbo 202506: 39.2 (#160), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1339 | 1436 |
Reasoning Step 1o Turbo 202506 leads
Step 1o Turbo 202506: 26.8 (#129), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1335 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Step 3.5 Flash leads
Step 1o Turbo 202506: 36.6 (#164), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1318 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge Step 3.5 Flash leads
Step 1o Turbo 202506: 36.1 (#176), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1308 | 1421 |
Multimodal Not comparable
Step 1o Turbo 202506: 36.1 (#80), Step 3.5 Flash: —
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1186 | — |
Multilingual Step 3.5 Flash leads
Step 1o Turbo 202506: 45.3 (#173), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1313 | 1385 |
| LMArena Chinese | 1380 | 1447 |
| LMArena German | 1314 | 1405 |
| LMArena Russian | 1327 | 1385 |
| LMArena French | — | 1421 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
| LMArena Spanish | — | 1419 |
Instruction Following Step 3.5 Flash leads
Step 1o Turbo 202506: 69.2 (#176), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1310 | 1385 |
Long Context Step 3.5 Flash leads
Step 1o Turbo 202506: 41.0 (#146), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1348 | 1402 |
Writing & Preference Step 3.5 Flash leads
Step 1o Turbo 202506: 53.1 (#160), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Step 1o Turbo 202506 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1336 | 1403 |
| LMArena Creative Writing | 1307 | 1357 |
| LMArena Multi-Turn | 1340 | 1405 |
Frequently asked questions
Is Step 1o Turbo 202506 better than Step 3.5 Flash?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 39.7 on the Noometry Index.
Is Step 1o Turbo 202506 or Step 3.5 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 39.2 in the Noometry coding category.
How many benchmarks do Step 1o Turbo 202506 and Step 3.5 Flash share?
13 benchmarks have published results for both models. Step 1o Turbo 202506 has 14 scored results on Noometry and Step 3.5 Flash has 19.