Model comparison
Step 3.5 Flash vs Yi-1.5-34B
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 30.6 on the Noometry Index.
Last verified . 17 shared benchmarks.
StepFunSummary
- They share 17 benchmarks with published results for both. Step 3.5 Flash scores higher in 7 categories and Yi-1.5-34B in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Step 3.5 Flash leads 39.6 to 14.8.
Side by side
| Step 3.5 Flash | Yi-1.5-34B | |
|---|---|---|
| Provider | StepFun | 01.AI |
| Noometry Index | 42.3 | 30.6 |
| Released | 2026-01-29 | 2024-05-13 |
| Weights | Open | Open |
| Context window | 256K | — |
| Max output | 256K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.30 | — |
| Results tracked | 19 | 21 |
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Category by category
Coding Step 3.5 Flash leads
Step 3.5 Flash: 42.4 (#105), Yi-1.5-34B: 32.4 (#272)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Coding | 1436 | 1169 |
| BigCodeBench Instruct | — | 33.9% |
| BigCodeBench Complete | — | 43.8% |
Reasoning Too close to call
Step 3.5 Flash: 22.2 (#202), Yi-1.5-34B: 22.5 (#191)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Hard Prompts | 1411 | 1160 |
| NYT Connections (extended) | 28.4% | — |
Math Step 3.5 Flash leads
Step 3.5 Flash: 42.6 (#84), Yi-1.5-34B: 27.5 (#249)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Math | 1408 | 1182 |
| MathArena Final-Answer Competitions | 66.8% | — |
| MATH Level 5 | — | 25.5% |
Knowledge Step 3.5 Flash leads
Step 3.5 Flash: 39.6 (#132), Yi-1.5-34B: 14.8 (#295)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Expert | 1421 | 1144 |
| GPQA Diamond | — | 32% |
Multilingual Step 3.5 Flash leads
Step 3.5 Flash: 50.5 (#119), Yi-1.5-34B: 32.3 (#256)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Non-English | 1385 | 1121 |
| LMArena Chinese | 1447 | 1213 |
| LMArena French | 1421 | 1156 |
| LMArena German | 1405 | 1111 |
| LMArena Japanese | 1354 | 1021 |
| LMArena Korean | 1352 | 1005 |
| LMArena Russian | 1385 | 1091 |
| LMArena Spanish | 1419 | 1121 |
Instruction Following Step 3.5 Flash leads
Step 3.5 Flash: 73.1 (#124), Yi-1.5-34B: 59.2 (#257)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Instruction Following | 1385 | 1139 |
Long Context Step 3.5 Flash leads
Step 3.5 Flash: 42.8 (#117), Yi-1.5-34B: 34.6 (#248)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Longer Query | 1402 | 1143 |
Writing & Preference Step 3.5 Flash leads
Step 3.5 Flash: 58.8 (#113), Yi-1.5-34B: 37.4 (#257)
| Benchmark | Step 3.5 Flash | Yi-1.5-34B |
|---|---|---|
| LMArena Text | 1403 | 1173 |
| LMArena Creative Writing | 1357 | 1135 |
| LMArena Multi-Turn | 1405 | 1153 |
Frequently asked questions
Is Step 3.5 Flash better than Yi-1.5-34B?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 30.6 on the Noometry Index.
Is Step 3.5 Flash or Yi-1.5-34B better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 32.4 in the Noometry coding category.
How many benchmarks do Step 3.5 Flash and Yi-1.5-34B share?
17 benchmarks have published results for both models. Step 3.5 Flash has 19 scored results on Noometry and Yi-1.5-34B has 21.