Model comparison
Mercury 2 vs Yi-1.5-34B
Mercury 2 is the stronger model overall, scoring 39.1 to 30.6 on the Noometry Index.
Last verified . 11 shared benchmarks.
Summary
- They share 11 benchmarks with published results for both. Mercury 2 scores higher in 7 categories and Yi-1.5-34B in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Mercury 2 leads 36.2 to 14.8.
- Yi-1.5-34B has downloadable open weights; the other is API-only.
Side by side
| Mercury 2 | Yi-1.5-34B | |
|---|---|---|
| Provider | Inception | 01.AI |
| Noometry Index | 39.1 | 30.6 |
| Released | 2026-02-20 | 2024-05-13 |
| Weights | Proprietary | Open |
| Context window | 128K | — |
| Max output | 50K | — |
| Input $ / M tokens | $0.25 | — |
| Output $ / M tokens | $0.75 | — |
| Results tracked | 17 | 21 |
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Category by category
Coding Mercury 2 leads
Mercury 2: 33.5 (#255), Yi-1.5-34B: 32.4 (#272)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Coding | 1391 | 1169 |
| LMArena WebDev | 1171 | — |
| SciCode | 38.7% | — |
| WeirdML | 43.2% | — |
| BigCodeBench Instruct | — | 33.9% |
| BigCodeBench Complete | — | 43.8% |
| ALE-Bench | 785.58 | — |
Reasoning Mercury 2 leads
Mercury 2: 23.8 (#170), Yi-1.5-34B: 22.5 (#191)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Hard Prompts | 1362 | 1160 |
| CritPt | 0.8% | — |
Math Not comparable
Mercury 2: —, Yi-1.5-34B: 27.5 (#249)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Math | — | 1182 |
| MATH Level 5 | — | 25.5% |
Knowledge Mercury 2 leads
Mercury 2: 36.2 (#172), Yi-1.5-34B: 14.8 (#295)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Expert | 1358 | 1144 |
| GPQA Diamond | — | 32% |
| Vectara Hallucination Rate | 12.3% | — |
Multilingual Mercury 2 leads
Mercury 2: 46.6 (#157), Yi-1.5-34B: 32.3 (#256)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Non-English | 1331 | 1121 |
| LMArena Chinese | 1417 | 1213 |
| LMArena Russian | 1304 | 1091 |
| LMArena French | — | 1156 |
| LMArena German | — | 1111 |
| LMArena Japanese | — | 1021 |
| LMArena Korean | — | 1005 |
| LMArena Spanish | — | 1121 |
Instruction Following Mercury 2 leads
Mercury 2: 70.2 (#165), Yi-1.5-34B: 59.2 (#257)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Instruction Following | 1329 | 1139 |
Long Context Mercury 2 leads
Mercury 2: 40.5 (#154), Yi-1.5-34B: 34.6 (#248)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Longer Query | 1330 | 1143 |
Writing & Preference Mercury 2 leads
Mercury 2: 53.8 (#155), Yi-1.5-34B: 37.4 (#257)
| Benchmark | Mercury 2 | Yi-1.5-34B |
|---|---|---|
| LMArena Text | 1355 | 1173 |
| LMArena Creative Writing | 1289 | 1135 |
| LMArena Multi-Turn | 1358 | 1153 |
Frequently asked questions
Is Mercury 2 better than Yi-1.5-34B?
Mercury 2 is the stronger model overall, scoring 39.1 to 30.6 on the Noometry Index.
Is Mercury 2 or Yi-1.5-34B better for coding?
Mercury 2 scores higher on coding benchmarks: 33.5 versus 32.4 in the Noometry coding category.
How many benchmarks do Mercury 2 and Yi-1.5-34B share?
11 benchmarks have published results for both models. Mercury 2 has 17 scored results on Noometry and Yi-1.5-34B has 21.