Model comparison
o3-mini vs Step 3.7 Flash
o3-mini and Step 3.7 Flash score almost the same on the Noometry Index (36.7 vs 37.3), so choose on price, context window or the category you care about most.
Last verified . 2 shared benchmarks.
StepFunSummary
- They share 2 benchmarks with published results for both. o3-mini scores higher in 1 category and Step 3.7 Flash in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Step 3.7 Flash leads 42.9 to 28.1.
- Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $1.10 / $4.40 for o3-mini.
- Step 3.7 Flash accepts more context: 256K tokens versus 200K.
- Step 3.7 Flash has downloadable open weights; the other is API-only.
Side by side
| o3-mini | Step 3.7 Flash | |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 36.7 | 37.3 |
| Released | 2024-12-20 | 2026-05-29 |
| Weights | Proprietary | Open |
| Context window | 200K | 256K |
| Max output | 100K | 256K |
| Input $ / M tokens | $1.10 | $0.18 |
| Output $ / M tokens | $4.40 | $1.11 |
| Results tracked | 51 | 5 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Too close to call
o3-mini: 40.8 (#132), Step 3.7 Flash: 40.0 (#150)
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| SciCode | 39.8% | 40% |
| Aider Polyglot | 60.4% | — |
| GSO | 1.3% | — |
| WeirdML | 43.7% | — |
| LiveBench Coding | 82.7% | — |
| LMArena Coding | 1378 | — |
| CadEval | 54% | — |
| ALE-Bench | — | 694.12 |
Agentic & Tool Use Not comparable
o3-mini: 29.6 (#84), Step 3.7 Flash: —
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| Cybench | 22.5% | — |
Reasoning Step 3.7 Flash leads
o3-mini: 16.3 (#305), Step 3.7 Flash: 21.6 (#219)
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| CritPt | 0.3% | 2.3% |
| ARC-AGI-2 | 3% | — |
| SimpleBench | 22.8% | — |
| NYT Connections (extended) | — | 39.7% |
| ARC-AGI-1 | 34.5% | — |
| Chess Puzzles | 17% | — |
| LiveBench Reasoning | 89.6% | — |
| LMArena Hard Prompts | 1366 | — |
| Mystery Game Puzzles | 7% | — |
| DTBench | 68.8% | — |
| LiveBench Data Analysis | 70.6% | — |
| LMCA | 19% | — |
| Epoch Capabilities Index | 140.34 | — |
| ForecastBench | 59.6 | — |
| LiveBench | 75.9% | — |
Math Step 3.7 Flash leads
o3-mini: 28.1 (#244), Step 3.7 Flash: 42.9 (#82)
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 18.6% | — |
| FrontierMath Tier 4 | 0% | — |
| MathArena Final-Answer Competitions | — | 68.5% |
| OTIS Mock AIME 2024-2025 | 76.9% | — |
| LiveBench Math | 77.3% | — |
| LMArena Math | 1396 | — |
| MATH Level 5 | 96.5% | — |
| FrontierMath (Feb 2025 set) | 12.4% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
o3-mini: 38.3 (#146), Step 3.7 Flash: —
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| GPQA Diamond | 77% | — |
| SimpleQA Verified | 15.3% | — |
| Confabulations | 17.9% | — |
| LMArena Expert | 1364 | — |
Multilingual Not comparable
o3-mini: 45.7 (#164), Step 3.7 Flash: —
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1319 | — |
| LMArena Chinese | 1379 | — |
| LMArena French | 1334 | — |
| LMArena German | 1303 | — |
| LMArena Japanese | 1286 | — |
| LMArena Korean | 1314 | — |
| LMArena Russian | 1304 | — |
| LMArena Spanish | 1321 | — |
Instruction Following Not comparable
o3-mini: 75.1 (#72), Step 3.7 Flash: —
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| LiveBench Instruction Following | 84.4% | — |
| LMArena Instruction Following | 1337 | — |
Long Context Not comparable
o3-mini: 33.8 (#256), Step 3.7 Flash: —
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| Fiction.LiveBench | 50% | — |
| LMArena Longer Query | 1343 | — |
Writing & Preference Not comparable
o3-mini: 50.3 (#182), Step 3.7 Flash: —
| Benchmark | o3-mini | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1337 | — |
| LMArena Creative Writing | 1286 | — |
| Short-Story Creative Writing | 61.7% | — |
| LMArena Multi-Turn | 1320 | — |
| LiveBench Language | 50.7% | — |
Frequently asked questions
Is o3-mini better than Step 3.7 Flash?
o3-mini and Step 3.7 Flash score almost the same on the Noometry Index (36.7 vs 37.3), so choose on price, context window or the category you care about most.
Which is cheaper, o3-mini or Step 3.7 Flash?
Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; o3-mini lists at $1.10 and $4.40.
Is o3-mini or Step 3.7 Flash better for coding?
They score almost the same on coding (40.8 vs 40.0); test both on your own repository before choosing.
Which has the bigger context window?
Step 3.7 Flash does, with 256K tokens against 200K.
How many benchmarks do o3-mini and Step 3.7 Flash share?
2 benchmarks have published results for both models. o3-mini has 51 scored results on Noometry and Step 3.7 Flash has 5.