Model comparison
Mercury 2.5 vs Yi-Lightning
Yi-Lightning is the stronger model overall, scoring 37.1 to 33.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where Yi-Lightning leads 36.2 to 23.3.
Side by side
| Mercury 2.5 | Yi-Lightning | |
|---|---|---|
| Provider | Inception | 01.AI |
| Noometry Index | 33.5 | 37.1 |
| Released | 2026-09-08 | 2024-12-02 |
| Weights | Proprietary | Proprietary |
| Context window | 260K | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.04 | — |
| Output $ / M tokens | $0.15 | — |
| Results tracked | 4 | 18 |
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Category by category
Coding Mercury 2.5 leads
Mercury 2.5: 39.5 (#156), Yi-Lightning: 27.4 (#320)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| Aider Polyglot | — | 12.9% |
| SciCode | 38.5% | — |
| LMArena Coding | — | 1312 |
| ALE-Bench | 301.65 | — |
Reasoning Yi-Lightning leads
Mercury 2.5: 22.4 (#193), Yi-Lightning: 25.9 (#139)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1302 |
Math Yi-Lightning leads
Mercury 2.5: 23.3 (#272), Yi-Lightning: 36.2 (#172)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| ProofBench | 3% | — |
| LMArena Math | — | 1300 |
Knowledge Not comparable
Mercury 2.5: —, Yi-Lightning: 35.4 (#185)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| LMArena Expert | — | 1286 |
Multilingual Not comparable
Mercury 2.5: —, Yi-Lightning: 42.2 (#196)
| Benchmark | Mercury 2.5 | 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 Not comparable
Mercury 2.5: —, Yi-Lightning: 67.4 (#196)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | — | 1278 |
Long Context Not comparable
Mercury 2.5: —, Yi-Lightning: 39.4 (#181)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | — | 1297 |
Writing & Preference Not comparable
Mercury 2.5: —, Yi-Lightning: 50.2 (#184)
| Benchmark | Mercury 2.5 | Yi-Lightning |
|---|---|---|
| LMArena Text | — | 1302 |
| LMArena Creative Writing | — | 1280 |
| LMArena Multi-Turn | — | 1311 |
Frequently asked questions
Is Mercury 2.5 better than Yi-Lightning?
Yi-Lightning is the stronger model overall, scoring 37.1 to 33.5 on the Noometry Index.
Is Mercury 2.5 or Yi-Lightning better for coding?
Mercury 2.5 scores higher on coding benchmarks: 39.5 versus 27.4 in the Noometry coding category.
How many benchmarks do Mercury 2.5 and Yi-Lightning share?
0 benchmarks have published results for both models. Mercury 2.5 has 4 scored results on Noometry and Yi-Lightning has 18.