Model comparison
Step 3.5 Flash vs Yi-34B
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 27.8 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 8 categories and Yi-34B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Step 3.5 Flash leads 39.6 to 7.5.
Side by side
| Step 3.5 Flash | Yi-34B | |
|---|---|---|
| Provider | StepFun | 01.AI |
| Noometry Index | 42.3 | 27.8 |
| Released | 2026-01-29 | 2023-11-02 |
| Weights | Open | Open |
| Context window | 256K | — |
| Max output | 256K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.30 | — |
| Results tracked | 19 | 23 |
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Category by category
Coding Step 3.5 Flash leads
Step 3.5 Flash: 42.4 (#105), Yi-34B: 32.3 (#274)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Coding | 1436 | 1112 |
Reasoning Step 3.5 Flash leads
Step 3.5 Flash: 22.2 (#202), Yi-34B: 21.2 (#226)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Hard Prompts | 1411 | 1104 |
| NYT Connections (extended) | 28.4% | — |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | — | 117.39 |
Math Step 3.5 Flash leads
Step 3.5 Flash: 42.6 (#84), Yi-34B: 21.6 (#282)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Math | 1408 | 1114 |
| MathArena Final-Answer Competitions | 66.8% | — |
| MATH Level 5 | — | 5.1% |
| GSM8K | — | 76% |
Knowledge Step 3.5 Flash leads
Step 3.5 Flash: 39.6 (#132), Yi-34B: 7.5 (#309)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Expert | 1421 | 1061 |
| GPQA Diamond | — | 14.7% |
| MMLU | — | 76.3% |
Multilingual Step 3.5 Flash leads
Step 3.5 Flash: 50.5 (#119), Yi-34B: 29.7 (#264)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Non-English | 1385 | 1079 |
| LMArena Chinese | 1447 | 1176 |
| LMArena French | 1421 | 1081 |
| LMArena German | 1405 | 1042 |
| LMArena Japanese | 1354 | 993 |
| LMArena Korean | 1352 | 959 |
| LMArena Russian | 1385 | 1050 |
| LMArena Spanish | 1419 | 1070 |
Instruction Following Step 3.5 Flash leads
Step 3.5 Flash: 73.1 (#124), Yi-34B: 56.2 (#274)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Instruction Following | 1385 | 1091 |
Long Context Step 3.5 Flash leads
Step 3.5 Flash: 42.8 (#117), Yi-34B: 33.2 (#264)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Longer Query | 1402 | 1094 |
Writing & Preference Step 3.5 Flash leads
Step 3.5 Flash: 58.8 (#113), Yi-34B: 34.1 (#273)
| Benchmark | Step 3.5 Flash | Yi-34B |
|---|---|---|
| LMArena Text | 1403 | 1129 |
| LMArena Creative Writing | 1357 | 1108 |
| LMArena Multi-Turn | 1405 | 1113 |
Frequently asked questions
Is Step 3.5 Flash better than Yi-34B?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 27.8 on the Noometry Index.
Is Step 3.5 Flash or Yi-34B better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 32.3 in the Noometry coding category.
How many benchmarks do Step 3.5 Flash and Yi-34B share?
17 benchmarks have published results for both models. Step 3.5 Flash has 19 scored results on Noometry and Yi-34B has 23.