Model comparison
Olmo 3.1 32b Think vs Step 3.5 Flash
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 37.9 on the Noometry Index.
Last verified . 15 shared benchmarks.
Allen Institute for AI (Ai2)
StepFunSummary
- They share 15 benchmarks with published results for both. Olmo 3.1 32b Think 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 writing & preference, where Step 3.5 Flash leads 58.8 to 46.2.
Side by side
| Olmo 3.1 32b Think | Step 3.5 Flash | |
|---|---|---|
| Provider | Allen Institute for AI (Ai2) | StepFun |
| Noometry Index | 37.9 | 42.3 |
| Released | — | 2026-01-29 |
| Weights | Open | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 15 | 19 |
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Category by category
Coding Step 3.5 Flash leads
Olmo 3.1 32b Think: 37.7 (#189), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1291 | 1436 |
Reasoning Olmo 3.1 32b Think leads
Olmo 3.1 32b Think: 25.2 (#150), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1272 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Step 3.5 Flash leads
Olmo 3.1 32b Think: 36.3 (#168), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1305 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge Step 3.5 Flash leads
Olmo 3.1 32b Think: 35.7 (#181), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1295 | 1421 |
Multilingual Step 3.5 Flash leads
Olmo 3.1 32b Think: 38.1 (#231), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1209 | 1385 |
| LMArena Chinese | 1242 | 1447 |
| LMArena French | 1260 | 1421 |
| LMArena German | 1262 | 1405 |
| LMArena Russian | 1193 | 1385 |
| LMArena Spanish | 1289 | 1419 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
Instruction Following Step 3.5 Flash leads
Olmo 3.1 32b Think: 65.6 (#218), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1247 | 1385 |
Long Context Step 3.5 Flash leads
Olmo 3.1 32b Think: 38.6 (#195), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1272 | 1402 |
Writing & Preference Step 3.5 Flash leads
Olmo 3.1 32b Think: 46.2 (#220), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Olmo 3.1 32b Think | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1272 | 1403 |
| LMArena Creative Writing | 1226 | 1357 |
| LMArena Multi-Turn | 1252 | 1405 |
Frequently asked questions
Is Olmo 3.1 32b Think better than Step 3.5 Flash?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 37.9 on the Noometry Index.
Is Olmo 3.1 32b Think or Step 3.5 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 37.7 in the Noometry coding category.
How many benchmarks do Olmo 3.1 32b Think and Step 3.5 Flash share?
15 benchmarks have published results for both models. Olmo 3.1 32b Think has 15 scored results on Noometry and Step 3.5 Flash has 19.