Model comparison
GPT-6 Luna vs Hy4 preview
GPT-6 Luna and Hy4 preview score almost the same on the Noometry Index (45.1 vs 44.6), so choose on price, context window or the category you care about most.
Last verified . 2 shared benchmarks.
TencentSummary
- They share 2 benchmarks with published results for both. GPT-6 Luna scores higher in 2 categories and Hy4 preview in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 54.5 to 35.6.
- GPT-6 Luna is cheaper at $0.10 / $0.50 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- GPT-6 Luna accepts more context: 1.05M tokens versus 1.05M.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| GPT-6 Luna | Hy4 preview | |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 45.1 | 44.6 |
| Released | 2026-09-22 | 2026-08-28 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 64K |
| Input $ / M tokens | $0.10 | $0.83 |
| Output $ / M tokens | $0.50 | $2.50 |
| Results tracked | 18 | 3 |
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Category by category
Coding GPT-6 Luna leads
GPT-6 Luna: 54.7 (#24), Hy4 preview: 51.4 (#36)
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| LMArena WebDev | 1583 | 1633 |
| DeepSWE | 66.6% | — |
| FrontierCode | 42.4% | — |
| LMArena Coding | 1448 | — |
Reasoning GPT-6 Luna leads
GPT-6 Luna: 31.7 (#68), Hy4 preview: 30.6 (#75)
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | 68.7% | 68.2% |
| LMArena Hard Prompts | 1415 | — |
Math Hy4 preview leads
GPT-6 Luna: 35.6 (#140), Hy4 preview: 54.5 (#37)
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| ProofBench | — | 75% |
| LMArena Math | 1396 | — |
Knowledge Not comparable
GPT-6 Luna: 40.1 (#110), Hy4 preview: —
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| LMArena Expert | 1458 | — |
Multimodal Not comparable
GPT-6 Luna: 42.0 (#27), Hy4 preview: —
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| Furniture Assembly | 44.2% | — |
Multilingual Not comparable
GPT-6 Luna: 51.0 (#111), Hy4 preview: —
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1390 | — |
| LMArena Chinese | 1425 | — |
| LMArena Russian | 1392 | — |
| LMArena Spanish | 1416 | — |
Instruction Following Not comparable
GPT-6 Luna: 74.7 (#85), Hy4 preview: —
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1414 | — |
Long Context Not comparable
GPT-6 Luna: 43.3 (#95), Hy4 preview: —
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1417 | — |
Writing & Preference Not comparable
GPT-6 Luna: 58.4 (#115), Hy4 preview: —
| Benchmark | GPT-6 Luna | Hy4 preview |
|---|---|---|
| LMArena Text | 1392 | — |
| LMArena Creative Writing | 1357 | — |
| LMArena Multi-Turn | 1400 | — |
Frequently asked questions
Is GPT-6 Luna better than Hy4 preview?
GPT-6 Luna and Hy4 preview score almost the same on the Noometry Index (45.1 vs 44.6), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-6 Luna or Hy4 preview?
GPT-6 Luna is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Hy4 preview lists at $0.83 and $2.50.
Is GPT-6 Luna or Hy4 preview better for coding?
GPT-6 Luna scores higher on coding benchmarks: 54.7 versus 51.4 in the Noometry coding category.
Which has the bigger context window?
GPT-6 Luna does, with 1.05M tokens against 1.05M.
How many benchmarks do GPT-6 Luna and Hy4 preview share?
2 benchmarks have published results for both models. GPT-6 Luna has 18 scored results on Noometry and Hy4 preview has 3.