Model comparison
GPT-5.5 Instant vs Yi-Lightning
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 37.1 on the Noometry Index.
Last verified . 17 shared benchmarks.
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 44.3 to 27.4.
Side by side
| GPT-5.5 Instant | Yi-Lightning | |
|---|---|---|
| Provider | OpenAI | 01.AI |
| Noometry Index | 42.7 | 37.1 |
| Released | 2026-05-05 | 2024-12-02 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 27 | 18 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 44.3 (#74), Yi-Lightning: 27.4 (#320)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1433 | 1312 |
| Aider Polyglot | — | 12.9% |
| SciCode | 48.6% | — |
Reasoning Too close to call
GPT-5.5 Instant: 24.9 (#155), Yi-Lightning: 25.9 (#139)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1302 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math Yi-Lightning leads
GPT-5.5 Instant: 26.5 (#259), Yi-Lightning: 36.2 (#172)
| 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 leads
GPT-5.5 Instant: 48.9 (#74), Yi-Lightning: 35.4 (#185)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1409 | 1286 |
| GPQA Diamond | 82.5% | — |
Multimodal Not comparable
GPT-5.5 Instant: 40.0 (#52), Yi-Lightning: —
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual GPT-5.5 Instant leads
GPT-5.5 Instant: 52.8 (#80), Yi-Lightning: 42.2 (#196)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1417 | 1269 |
| LMArena Chinese | 1456 | 1320 |
| LMArena French | 1428 | 1305 |
| LMArena German | 1411 | 1267 |
| LMArena Japanese | 1408 | 1228 |
| LMArena Korean | 1392 | 1192 |
| LMArena Russian | 1431 | 1255 |
| LMArena Spanish | 1429 | 1315 |
Instruction Following GPT-5.5 Instant leads
GPT-5.5 Instant: 74.2 (#100), Yi-Lightning: 67.4 (#196)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1406 | 1278 |
Long Context GPT-5.5 Instant leads
GPT-5.5 Instant: 43.4 (#96), Yi-Lightning: 39.4 (#181)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1422 | 1297 |
Writing & Preference GPT-5.5 Instant leads
GPT-5.5 Instant: 61.8 (#85), Yi-Lightning: 50.2 (#184)
| Benchmark | GPT-5.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Text | 1419 | 1302 |
| LMArena Creative Writing | 1419 | 1280 |
| LMArena Multi-Turn | 1433 | 1311 |
Frequently asked questions
Is GPT-5.5 Instant better than Yi-Lightning?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 37.1 on the Noometry Index.
Is GPT-5.5 Instant or Yi-Lightning better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 27.4 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.