Model comparison
Hy4 preview vs Mercury 2
Hy4 preview is the stronger model overall, scoring 45.3 to 39.1 on the Noometry Index. Mercury 2 costs 3.3× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
TencentSummary
- They share 1 benchmark with published results for both. Hy4 preview scores higher in 2 categories and Mercury 2 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Hy4 preview leads 51.6 to 33.5.
- Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 128K.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Hy4 preview | Mercury 2 | |
|---|---|---|
| Provider | Tencent | Inception |
| Noometry Index | 45.3 | 39.1 |
| Released | 2026-08-28 | 2026-02-20 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 64K | 50K |
| Input $ / M tokens | $0.83 | $0.25 |
| Output $ / M tokens | $2.50 | $0.75 |
| Results tracked | 3 | 17 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.6 (#38), Mercury 2: 33.5 (#255)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| LMArena WebDev | 1632 | 1171 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| LMArena Coding | — | 1391 |
| ALE-Bench | — | 785.58 |
Reasoning Hy4 preview leads
Hy4 preview: 31.9 (#79), Mercury 2: 23.8 (#170)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| NYT Connections (extended) | 68.2% | — |
| CritPt | — | 0.8% |
| LMArena Hard Prompts | — | 1362 |
Math Not comparable
Hy4 preview: 55.7 (#42), Mercury 2: —
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| ProofBench | 75% | — |
Knowledge Not comparable
Hy4 preview: —, Mercury 2: 36.2 (#172)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| Vectara Hallucination Rate | — | 12.3% |
| LMArena Expert | — | 1358 |
Multilingual Not comparable
Hy4 preview: —, Mercury 2: 46.6 (#157)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| LMArena Non-English | — | 1331 |
| LMArena Chinese | — | 1417 |
| LMArena Russian | — | 1304 |
Instruction Following Not comparable
Hy4 preview: —, Mercury 2: 70.2 (#165)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | — | 1329 |
Long Context Not comparable
Hy4 preview: —, Mercury 2: 40.5 (#154)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| LMArena Longer Query | — | 1330 |
Writing & Preference Not comparable
Hy4 preview: —, Mercury 2: 53.8 (#155)
| Benchmark | Hy4 preview | Mercury 2 |
|---|---|---|
| LMArena Text | — | 1355 |
| LMArena Creative Writing | — | 1289 |
| LMArena Multi-Turn | — | 1358 |
Frequently asked questions
Is Hy4 preview better than Mercury 2?
Hy4 preview is the stronger model overall, scoring 45.3 to 39.1 on the Noometry Index. Mercury 2 costs 3.3× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.
Which is cheaper, Hy4 preview or Mercury 2?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Hy4 preview lists at $0.83 and $2.50.
Is Hy4 preview or Mercury 2 better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 33.5 in the Noometry coding category.
Which has the bigger context window?
Hy4 preview does, with 1.05M tokens against 128K.
How many benchmarks do Hy4 preview and Mercury 2 share?
1 benchmark has published results for both models. Hy4 preview has 3 scored results on Noometry and Mercury 2 has 17.