Model comparison
o1-mini vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 34.0 on the Noometry Index.
Last verified . 13 shared benchmarks.
StepFunSummary
- They share 13 benchmarks with published results for both. o1-mini scores higher in 0 categories and Step 5 Preview in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 8.8.
Side by side
| o1-mini | Step 5 Preview | |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 34.0 | 47.9 |
| Released | 2024-09-12 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 39 | 18 |
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Category by category
Coding Step 5 Preview leads
o1-mini: 35.5 (#224), Step 5 Preview: 51.8 (#36)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1362 | 1480 |
| Aider Polyglot | 32.9% | — |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
| WeirdML | 36.3% | — |
| LiveBench Coding | 48% | — |
| HumanEval+ | 89% | — |
| MBPP+ | 78.8% | — |
Agentic & Tool Use Not comparable
o1-mini: 24.6 (#118), Step 5 Preview: —
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| Cybench | 10% | — |
Reasoning Step 5 Preview leads
o1-mini: 8.8 (#346), Step 5 Preview: 40.0 (#57)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1333 | 1465 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 18.1% | — |
| ARC-AGI-1 | 14% | — |
| CritPt | — | 20.9% |
| LiveBench Reasoning | 72.3% | — |
| LiveBench Data Analysis | 57.9% | — |
| Epoch Capabilities Index | 135.82 | — |
| LiveBench | 57.8% | — |
Math Step 5 Preview leads
o1-mini: 35.4 (#186), Step 5 Preview: 46.1 (#72)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Math | 1358 | 1470 |
| OTIS Mock AIME 2024-2025 | 46.9% | — |
| ProofBench | — | 42% |
| LiveBench Math | 62% | — |
| MATH Level 5 | 89.2% | — |
| FrontierMath (Feb 2025 set) | 1.7% | — |
Knowledge Step 5 Preview leads
o1-mini: 34.9 (#192), Step 5 Preview: 41.2 (#112)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1316 | 1470 |
| GPQA Diamond | 62.4% | — |
| Confabulations | 18.6% | — |
Multimodal Not comparable
o1-mini: —, Step 5 Preview: 41.0 (#41)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
o1-mini: 43.6 (#182), Step 5 Preview: 53.8 (#54)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1289 | 1432 |
| LMArena Chinese | 1314 | 1519 |
| LMArena Russian | 1283 | 1436 |
| LMArena Spanish | 1303 | 1439 |
| LMArena French | 1293 | — |
| LMArena German | 1278 | — |
| LMArena Japanese | 1245 | — |
| LMArena Korean | 1223 | — |
Instruction Following Step 5 Preview leads
o1-mini: 66.7 (#206), Step 5 Preview: 76.0 (#50)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1304 | 1444 |
| LiveBench Instruction Following | 65.4% | — |
Long Context Step 5 Preview leads
o1-mini: 40.1 (#161), Step 5 Preview: 44.5 (#64)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1320 | 1455 |
Writing & Preference Step 5 Preview leads
o1-mini: 48.4 (#202), Step 5 Preview: 62.8 (#71)
| Benchmark | o1-mini | Step 5 Preview |
|---|---|---|
| LMArena Text | 1317 | 1442 |
| LMArena Creative Writing | 1244 | 1410 |
| LMArena Multi-Turn | 1314 | 1447 |
| Short-Story Creative Writing | 64.9% | — |
| LiveBench Language | 40.9% | — |
Frequently asked questions
Is o1-mini better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 34.0 on the Noometry Index.
Is o1-mini or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 35.5 in the Noometry coding category.
How many benchmarks do o1-mini and Step 5 Preview share?
13 benchmarks have published results for both models. o1-mini has 39 scored results on Noometry and Step 5 Preview has 18.