# Step 3.7 Flash vs Yi-Lightning

> Step 3.7 Flash and Yi-Lightning score almost the same on the Noometry Index (37.3 vs 37.1), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/step-3-7-flash-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where Step 3.7 Flash leads 40.0 to 27.4.
- Step 3.7 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| Provider | StepFun | 01.AI |
| Noometry Index | 37.3 | 37.1 |
| Rank | 207 | 209 |
| Context | 256K | — |
| Input $/M | $0.18 | — |
| Output $/M | $1.11 | — |
| Weights | Open | Proprietary |

## Coding

- Step 3.7 Flash: 40.0 (#150)
- Yi-Lightning: 27.4 (#320)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| Aider Polyglot | — | 12.9% |
| SciCode | 40% | — |
| LMArena Coding | — | 1312 |
| ALE-Bench | 694.12 | — |

## Reasoning

- Step 3.7 Flash: 21.6 (#219)
- Yi-Lightning: 25.9 (#139)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| NYT Connections (extended) | 39.7% | — |
| CritPt | 2.3% | — |
| LMArena Hard Prompts | — | 1302 |

## Math

- Step 3.7 Flash: 42.9 (#82)
- Yi-Lightning: 36.2 (#172)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| MathArena Final-Answer Competitions | 68.5% | — |
| LMArena Math | — | 1300 |

## Knowledge

- Step 3.7 Flash: —
- Yi-Lightning: 35.4 (#185)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| LMArena Expert | — | 1286 |

## Multilingual

- Step 3.7 Flash: —
- Yi-Lightning: 42.2 (#196)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| LMArena Non-English | — | 1269 |
| LMArena Chinese | — | 1320 |
| LMArena French | — | 1305 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |
| LMArena Russian | — | 1255 |
| LMArena Spanish | — | 1315 |

## Instruction Following

- Step 3.7 Flash: —
- Yi-Lightning: 67.4 (#196)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | — | 1278 |

## Long Context

- Step 3.7 Flash: —
- Yi-Lightning: 39.4 (#181)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | — | 1297 |

## Writing & Preference

- Step 3.7 Flash: —
- Yi-Lightning: 50.2 (#184)

| Benchmark | Step 3.7 Flash | Yi-Lightning |
|---|---|---|
| LMArena Text | — | 1302 |
| LMArena Creative Writing | — | 1280 |
| LMArena Multi-Turn | — | 1311 |

## FAQ

### Is Step 3.7 Flash better than Yi-Lightning?

Step 3.7 Flash and Yi-Lightning score almost the same on the Noometry Index (37.3 vs 37.1), so choose on price, context window or the category you care about most.

### Is Step 3.7 Flash or Yi-Lightning better for coding?

Step 3.7 Flash scores higher on coding benchmarks: 40.0 versus 27.4 in the Noometry coding category.

### How many benchmarks do Step 3.7 Flash and Yi-Lightning share?

0 benchmarks have published results for both models. Step 3.7 Flash has 5 scored results on Noometry and Yi-Lightning has 18.