Model comparison
Olmo 3.1 32b Instruct vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 39.4 on the Noometry Index.
Last verified . 13 shared benchmarks.
Allen Institute for AI (Ai2)
StepFunSummary
- They share 13 benchmarks with published results for both. Olmo 3.1 32b Instruct 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 26.4.
- Olmo 3.1 32b Instruct has downloadable open weights; the other is API-only.
Side by side
| Olmo 3.1 32b Instruct | Step 5 Preview | |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | StepFun |
| Noometry Index | 39.4 | 47.9 |
| Released | — | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 16 | 18 |
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Category by category
Coding Step 5 Preview leads
Olmo 3.1 32b Instruct: 39.5 (#157), Step 5 Preview: 51.8 (#36)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1347 | 1480 |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
Reasoning Step 5 Preview leads
Olmo 3.1 32b Instruct: 26.4 (#132), Step 5 Preview: 40.0 (#57)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1322 | 1465 |
| CritPt | — | 20.9% |
Math Step 5 Preview leads
Olmo 3.1 32b Instruct: 36.3 (#167), Step 5 Preview: 46.1 (#72)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Math | 1305 | 1470 |
| ProofBench | — | 42% |
Knowledge Step 5 Preview leads
Olmo 3.1 32b Instruct: 36.1 (#175), Step 5 Preview: 41.2 (#112)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1308 | 1470 |
Multimodal Not comparable
Olmo 3.1 32b Instruct: —, Step 5 Preview: 41.0 (#41)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
Olmo 3.1 32b Instruct: 42.6 (#191), Step 5 Preview: 53.8 (#54)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1275 | 1432 |
| LMArena Chinese | 1304 | 1519 |
| LMArena Russian | 1268 | 1436 |
| LMArena Spanish | 1336 | 1439 |
| LMArena French | 1328 | — |
| LMArena German | 1282 | — |
| LMArena Korean | 1206 | — |
Instruction Following Step 5 Preview leads
Olmo 3.1 32b Instruct: 68.6 (#187), Step 5 Preview: 76.0 (#50)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1299 | 1444 |
Long Context Step 5 Preview leads
Olmo 3.1 32b Instruct: 39.9 (#166), Step 5 Preview: 44.5 (#64)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1312 | 1455 |
Writing & Preference Step 5 Preview leads
Olmo 3.1 32b Instruct: 50.2 (#185), Step 5 Preview: 62.8 (#71)
| Benchmark | Olmo 3.1 32b Instruct | Step 5 Preview |
|---|---|---|
| LMArena Text | 1311 | 1442 |
| LMArena Creative Writing | 1264 | 1410 |
| LMArena Multi-Turn | 1309 | 1447 |
Frequently asked questions
Is Olmo 3.1 32b Instruct better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 39.4 on the Noometry Index.
Is Olmo 3.1 32b Instruct or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 39.5 in the Noometry coding category.
How many benchmarks do Olmo 3.1 32b Instruct and Step 5 Preview share?
13 benchmarks have published results for both models. Olmo 3.1 32b Instruct has 16 scored results on Noometry and Step 5 Preview has 18.