Model comparison
Hy4 preview vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 45.3 on the Noometry Index. Hy4 preview costs 1.8× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
Tencent
MetaSummary
- They share 3 benchmarks with published results for both. Hy4 preview scores higher in 2 categories and Muse Spark 1.2 in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 31.9.
- The biggest single-benchmark swing is ProofBench: 75% for Hy4 preview and 43% for Muse Spark 1.2.
- Hy4 preview is cheaper at $0.75 / $2.25 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Hy4 preview | Muse Spark 1.2 | |
|---|---|---|
| Provider | Tencent | Meta |
| Noometry Index | 45.3 | 50.3 |
| Released | 2026-08-28 | 2026-08-05 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 1.05M |
| Max output | 64K | 131K |
| Input $ / M tokens | $0.75 | $1.25 |
| Output $ / M tokens | $2.25 | $4.25 |
| Results tracked | 3 | 31 |
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Category by category
Coding Hy4 preview leads
Hy4 preview: 51.6 (#38), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1632 | 1533 |
| DeepSWE | — | 54.9% |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| WeirdML | — | 60.3% |
| LMArena Coding | — | 1495 |
Agentic & Tool Use Not comparable
Hy4 preview: —, Muse Spark 1.2: 29.4 (#87)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| GDP.pdf | — | 16% |
Reasoning Muse Spark 1.2 leads
Hy4 preview: 31.9 (#79), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| NYT Connections (extended) | 68.2% | 79.2% |
| SimpleBench | — | 74.5% |
| CritPt | — | 17.7% |
| LMArena Hard Prompts | — | 1486 |
| DTBench | — | 94.7% |
| LMCA | — | 48.4% |
| Epoch Capabilities Index | — | 154.87 |
Math Hy4 preview leads
Hy4 preview: 55.7 (#42), Muse Spark 1.2: 46.4 (#70)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 75% | 43% |
| LMArena Math | — | 1471 |
Knowledge Not comparable
Hy4 preview: —, Muse Spark 1.2: 54.1 (#53)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | — | 60.3% |
| LMArena Expert | — | 1480 |
Multimodal Not comparable
Hy4 preview: —, Muse Spark 1.2: 43.4 (#25)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1305 |
Multilingual Not comparable
Hy4 preview: —, Muse Spark 1.2: 57.1 (#11)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | — | 1478 |
| LMArena Chinese | — | 1511 |
| LMArena French | — | 1513 |
| LMArena Russian | — | 1487 |
| LMArena Spanish | — | 1498 |
Instruction Following Not comparable
Hy4 preview: —, Muse Spark 1.2: 76.7 (#36)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | — | 1461 |
Long Context Not comparable
Hy4 preview: —, Muse Spark 1.2: 45.2 (#48)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | — | 1475 |
Writing & Preference Not comparable
Hy4 preview: —, Muse Spark 1.2: 72.3 (#14)
| Benchmark | Hy4 preview | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | — | 1482 |
| LMArena Creative Writing | — | 1449 |
| EQ-Bench Creative Writing | — | 1840 |
| LMArena Multi-Turn | — | 1494 |
Frequently asked questions
Is Hy4 preview better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 45.3 on the Noometry Index. Hy4 preview costs 1.8× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Which is cheaper, Hy4 preview or Muse Spark 1.2?
Hy4 preview is cheaper. It lists at $0.75 per million input tokens and $2.25 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is Hy4 preview or Muse Spark 1.2 better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Both accept 1.05M tokens.
How many benchmarks do Hy4 preview and Muse Spark 1.2 share?
3 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Muse Spark 1.2 has 31.