# GPT-5.5 Instant vs Yi-Lightning

> GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 36.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.5 Instant scores higher in 6 categories and Yi-Lightning in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5.5 Instant leads 43.7 to 27.0.

## Snapshot

| | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| Provider | OpenAI | 01.AI |
| Noometry Index | 42.5 | 36.5 |
| Rank | 99 | 206 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- Yi-Lightning: 27.0 (#315)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1433 | 1313 |
| Aider Polyglot | — | 12.9% |
| SciCode | 48.6% | — |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- Yi-Lightning: 24.9 (#137)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1302 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.48 | — |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- Yi-Lightning: 33.5 (#173)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Math | 1420 | 1300 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- Yi-Lightning: 34.8 (#182)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1409 | 1286 |
| GPQA Diamond | 82.5% | — |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- Yi-Lightning: —

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- Yi-Lightning: 42.4 (#191)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1417 | 1269 |
| LMArena Chinese | 1457 | 1320 |
| LMArena French | 1428 | 1304 |
| LMArena German | 1410 | 1267 |
| LMArena Japanese | 1408 | 1228 |
| LMArena Korean | 1393 | 1192 |
| LMArena Russian | 1430 | 1255 |
| LMArena Spanish | 1430 | 1315 |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- Yi-Lightning: 67.6 (#191)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1407 | 1278 |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- Yi-Lightning: 39.4 (#176)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1422 | 1297 |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- Yi-Lightning: 50.4 (#178)

| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Text | 1419 | 1302 |
| LMArena Creative Writing | 1420 | 1280 |
| LMArena Multi-Turn | 1434 | 1311 |

## FAQ

### Is GPT-5.5 Instant better than Yi-Lightning?

GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 36.5 on the Noometry Index.

### Is GPT-5.5 Instant or Yi-Lightning better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 27.0 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Yi-Lightning share?

17 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Yi-Lightning has 18.