Model comparison
GPT-5.5 Pro vs Hy4 preview
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 45.3 on the Noometry Index. Hy4 preview costs 60× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
TencentSummary
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 31.9.
- Hy4 preview is cheaper at $0.75 / $2.25 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 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-5.5 Pro | Hy4 preview | |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 64.3 | 45.3 |
| Released | 2026-04-23 | 2026-08-28 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 64K |
| Input $ / M tokens | $30 | $0.75 |
| Output $ / M tokens | $180 | $2.25 |
| Results tracked | 14 | 3 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
GPT-5.5 Pro: —, Hy4 preview: 51.6 (#38)
| Benchmark | GPT-5.5 Pro | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1632 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Hy4 preview: 31.9 (#79)
| Benchmark | GPT-5.5 Pro | Hy4 preview |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| NYT Connections (extended) | — | 68.2% |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Hy4 preview: 55.7 (#42)
| Benchmark | GPT-5.5 Pro | Hy4 preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | — | 75% |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge Not comparable
GPT-5.5 Pro: 64.1 (#19), Hy4 preview: —
| Benchmark | GPT-5.5 Pro | Hy4 preview |
|---|---|---|
| GPQA Diamond | 93.9% | — |
Frequently asked questions
Is GPT-5.5 Pro better than Hy4 preview?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 45.3 on the Noometry Index. Hy4 preview costs 60× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Hy4 preview?
Hy4 preview is cheaper. It lists at $0.75 per million input tokens and $2.25 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 1.05M.
How many benchmarks do GPT-5.5 Pro and Hy4 preview share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Hy4 preview has 3.