Model comparison
GPT-5.4 mini vs Hy4 preview
GPT-5.4 mini and Hy4 preview score almost the same on the Noometry Index (45.0 vs 45.3), so choose on price, context window or the category you care about most.
Last verified . 3 shared benchmarks.
TencentSummary
- They share 3 benchmarks with published results for both. GPT-5.4 mini scores higher in 0 categories and Hy4 preview in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 55.7 to 45.5.
- The biggest single-benchmark swing is ProofBench: 21% for GPT-5.4 mini and 75% for Hy4 preview.
- Hy4 preview is cheaper at $0.75 / $2.25 per million input/output tokens, against $0.75 / $4.50 for GPT-5.4 mini.
- Hy4 preview accepts more context: 1.05M tokens versus 400K.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| GPT-5.4 mini | Hy4 preview | |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 45.0 | 45.3 |
| Released | 2026-03-17 | 2026-08-28 |
| Weights | Proprietary | Open |
| Context window | 400K | 1.05M |
| Max output | 128K | 64K |
| Input $ / M tokens | $0.75 | $0.75 |
| Output $ / M tokens | $4.50 | $2.25 |
| Results tracked | 46 | 3 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Hy4 preview leads
GPT-5.4 mini: 45.2 (#72), Hy4 preview: 51.6 (#38)
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena WebDev | 1397 | 1632 |
| FrontierCode | 27% | — |
| SciCode | 49.9% | — |
| WeirdML | 60.3% | — |
| LMArena Coding | 1438 | — |
| ALE-Bench | 1,189 | — |
Agentic & Tool Use Not comparable
GPT-5.4 mini: 29.9 (#81), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| DeepResearch Bench | 36.3% | — |
Reasoning Hy4 preview leads
GPT-5.4 mini: 30.4 (#85), Hy4 preview: 31.9 (#79)
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | 61.8% | 68.2% |
| ARC-AGI-2 | 18.9% | — |
| Kagi LLM Benchmark | 37.9% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 10% | — |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 61.7% | — |
| LMArena Hard Prompts | 1424 | — |
| Mystery Game Puzzles | 11% | — |
| DTBench | 80% | — |
| LMCA | 40.8% | — |
| Epoch Capabilities Index | 148.84 | — |
| ForecastBench | 57 | — |
Math Hy4 preview leads
GPT-5.4 mini: 45.5 (#75), Hy4 preview: 55.7 (#42)
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| ProofBench | 21% | 75% |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 9.8% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| LMArena Math | 1419 | — |
| FrontierMath (Feb 2025 set) | 28.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge Not comparable
GPT-5.4 mini: 51.5 (#67), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| GPQA Diamond | 86.9% | — |
| SimpleQA Verified | 29.4% | — |
| Vectara Hallucination Rate | 5.5% | — |
| LMArena Expert | 1435 | — |
Multimodal Not comparable
GPT-5.4 mini: 39.7 (#56), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Vision | 1245 | — |
Multilingual Not comparable
GPT-5.4 mini: 51.9 (#96), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1405 | — |
| LMArena Chinese | 1446 | — |
| LMArena French | 1440 | — |
| LMArena German | 1409 | — |
| LMArena Japanese | 1374 | — |
| LMArena Korean | 1368 | — |
| LMArena Russian | 1417 | — |
| LMArena Spanish | 1405 | — |
Instruction Following Not comparable
GPT-5.4 mini: 74.1 (#102), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1405 | — |
Long Context Not comparable
GPT-5.4 mini: 43.0 (#112), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1407 | — |
Writing & Preference Not comparable
GPT-5.4 mini: 64.0 (#58), Hy4 preview: —
| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Text | 1412 | — |
| LMArena Creative Writing | 1370 | — |
| EQ-Bench Creative Writing | 1665 | — |
| LMArena Multi-Turn | 1429 | — |
Frequently asked questions
Is GPT-5.4 mini better than Hy4 preview?
GPT-5.4 mini and Hy4 preview score almost the same on the Noometry Index (45.0 vs 45.3), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.4 mini or Hy4 preview?
Hy4 preview is cheaper. It lists at $0.75 per million input tokens and $2.25 per million output tokens; GPT-5.4 mini lists at $0.75 and $4.50.
Is GPT-5.4 mini or Hy4 preview better for coding?
Hy4 preview scores higher on coding benchmarks: 51.6 versus 45.2 in the Noometry coding category.
Which has the bigger context window?
Hy4 preview does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5.4 mini and Hy4 preview share?
3 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Hy4 preview has 3.