Model comparison
Step 3.5 Flash vs Step 3.7 Flash
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 37.3 on the Noometry Index.
Last verified . 2 shared benchmarks.
StepFunSummary
- They share 2 benchmarks with published results for both. Step 3.5 Flash scores higher in 2 categories and Step 3.7 Flash in 1 category; one gap is clear of the uncertainty.
- The biggest single-benchmark swing is NYT Connections (extended): 28.4% for Step 3.5 Flash and 39.7% for Step 3.7 Flash.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.18 / $1.11 for Step 3.7 Flash.
Side by side
| Step 3.5 Flash | Step 3.7 Flash | |
|---|---|---|
| Provider | StepFun | StepFun |
| Noometry Index | 42.3 | 37.3 |
| Released | 2026-01-29 | 2026-05-29 |
| Weights | Open | Open |
| Context window | 256K | 256K |
| Max output | 256K | 256K |
| Input $ / M tokens | $0.10 | $0.18 |
| Output $ / M tokens | $0.30 | $1.11 |
| Results tracked | 19 | 5 |
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Category by category
Coding Step 3.5 Flash leads
Step 3.5 Flash: 42.4 (#105), Step 3.7 Flash: 40.0 (#150)
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| SciCode | — | 40% |
| LMArena Coding | 1436 | — |
| ALE-Bench | — | 694.12 |
Reasoning Too close to call
Step 3.5 Flash: 22.2 (#202), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| NYT Connections (extended) | 28.4% | 39.7% |
| CritPt | — | 2.3% |
| LMArena Hard Prompts | 1411 | — |
Math Too close to call
Step 3.5 Flash: 42.6 (#84), Step 3.7 Flash: 42.9 (#82)
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | 66.8% | 68.5% |
| LMArena Math | 1408 | — |
Knowledge Not comparable
Step 3.5 Flash: 39.6 (#132), Step 3.7 Flash: —
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| LMArena Expert | 1421 | — |
Multilingual Not comparable
Step 3.5 Flash: 50.5 (#119), Step 3.7 Flash: —
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1385 | — |
| LMArena Chinese | 1447 | — |
| LMArena French | 1421 | — |
| LMArena German | 1405 | — |
| LMArena Japanese | 1354 | — |
| LMArena Korean | 1352 | — |
| LMArena Russian | 1385 | — |
| LMArena Spanish | 1419 | — |
Instruction Following Not comparable
Step 3.5 Flash: 73.1 (#124), Step 3.7 Flash: —
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| LMArena Instruction Following | 1385 | — |
Long Context Not comparable
Step 3.5 Flash: 42.8 (#117), Step 3.7 Flash: —
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| LMArena Longer Query | 1402 | — |
Writing & Preference Not comparable
Step 3.5 Flash: 58.8 (#113), Step 3.7 Flash: —
| Benchmark | Step 3.5 Flash | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1403 | — |
| LMArena Creative Writing | 1357 | — |
| LMArena Multi-Turn | 1405 | — |
Frequently asked questions
Is Step 3.5 Flash better than Step 3.7 Flash?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 37.3 on the Noometry Index.
Which is cheaper, Step 3.5 Flash or Step 3.7 Flash?
Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Step 3.7 Flash lists at $0.18 and $1.11.
Is Step 3.5 Flash or Step 3.7 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 40.0 in the Noometry coding category.
Which has the bigger context window?
Both accept 256K tokens.
How many benchmarks do Step 3.5 Flash and Step 3.7 Flash share?
2 benchmarks have published results for both models. Step 3.5 Flash has 19 scored results on Noometry and Step 3.7 Flash has 5.