Model comparison
GPT-5.4 Pro vs Hy4 preview
GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 44.6 on the Noometry Index. Hy4 preview costs 54× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
TencentSummary
- The widest gap is in reasoning, where GPT-5.4 Pro leads 71.0 to 30.6.
- Hy4 preview is cheaper at $0.83 / $2.50 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 1.05M.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| GPT-5.4 Pro | Hy4 preview | |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 58.8 | 44.6 |
| Released | 2026-03-05 | 2026-08-28 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 64K |
| Input $ / M tokens | $30 | $0.83 |
| Output $ / M tokens | $180 | $2.50 |
| Results tracked | 16 | 3 |
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Category by category
Coding Hy4 preview leads
GPT-5.4 Pro: 42.6 (#89), Hy4 preview: 51.4 (#36)
| Benchmark | GPT-5.4 Pro | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1633 |
| WeirdML | 57.4% | — |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 71.0 (#10), Hy4 preview: 30.6 (#75)
| Benchmark | GPT-5.4 Pro | Hy4 preview |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| NYT Connections (extended) | — | 68.2% |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| Epoch Capabilities Index | 159.12 | — |
Math GPT-5.4 Pro leads
GPT-5.4 Pro: 72.0 (#17), Hy4 preview: 54.5 (#37)
| Benchmark | GPT-5.4 Pro | Hy4 preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| ProofBench | — | 75% |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge Not comparable
GPT-5.4 Pro: 68.3 (#6), Hy4 preview: —
| Benchmark | GPT-5.4 Pro | Hy4 preview |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
Frequently asked questions
Is GPT-5.4 Pro better than Hy4 preview?
GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 44.6 on the Noometry Index. Hy4 preview costs 54× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.4 Pro or Hy4 preview?
Hy4 preview is cheaper. It lists at $0.83 per million input tokens and $2.50 per million output tokens; GPT-5.4 Pro lists at $30 and $180.
Is GPT-5.4 Pro or Hy4 preview better for coding?
Hy4 preview scores higher on coding benchmarks: 51.4 versus 42.6 in the Noometry coding category.
Which has the bigger context window?
GPT-5.4 Pro does, with 1.05M tokens against 1.05M.
How many benchmarks do GPT-5.4 Pro and Hy4 preview share?
0 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Hy4 preview has 3.