Model comparison
Grok 4.5 vs Hy4 preview
Grok 4.5 is the stronger model overall, scoring 55.0 to 45.3 on the Noometry Index. Hy4 preview costs 2.4× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
TencentSummary
- They share 3 benchmarks with published results for both. Grok 4.5 scores higher in 3 categories and Hy4 preview in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 31.9.
- The biggest single-benchmark swing is ProofBench: 31% for Grok 4.5 and 75% for Hy4 preview.
- Hy4 preview is cheaper at $0.83 / $2.50 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Hy4 preview accepts more context: 1.05M tokens versus 500K.
- Hy4 preview has downloadable open weights; the other is API-only.
Side by side
| Grok 4.5 | Hy4 preview | |
|---|---|---|
| Provider | xAI | Tencent |
| Noometry Index | 55.0 | 45.3 |
| Released | 2026-07-08 | 2026-08-28 |
| Weights | Proprietary | Open |
| Context window | 500K | 1.05M |
| Max output | 500K | 64K |
| Input $ / M tokens | $2 | $0.83 |
| Output $ / M tokens | $6 | $2.50 |
| Results tracked | 52 | 3 |
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Category by category
Coding Too close to call
Grok 4.5: 52.2 (#35), Hy4 preview: 51.6 (#38)
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| LMArena WebDev | 1553 | 1632 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| SciCode | 54.1% | — |
| WeirdML | 46.4% | — |
| LMArena Coding | 1474 | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Not comparable
Grok 4.5: 44.4 (#17), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| APEX-Agents | 56.2% | — |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |
Reasoning Grok 4.5 leads
Grok 4.5: 56.1 (#25), Hy4 preview: 31.9 (#79)
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | 79.9% | 68.2% |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| ARC-AGI-1 | 87.2% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 36% | — |
| LMArena Hard Prompts | 1462 | — |
| DTBench | 96.5% | — |
| LMCA | 45.2% | — |
| Surface Evolver Bench | 74.4% | — |
| Epoch Capabilities Index | 153.92 | — |
Math Grok 4.5 leads
Grok 4.5: 60.9 (#35), Hy4 preview: 55.7 (#42)
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| ProofBench | 31% | 75% |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| LMArena Math | 1459 | — |
Knowledge Not comparable
Grok 4.5: 62.3 (#24), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |
| LMArena Expert | 1466 | — |
Multimodal Not comparable
Grok 4.5: 37.6 (#72), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| LMArena Vision | 1288 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |
Multilingual Not comparable
Grok 4.5: 54.4 (#42), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1440 | — |
| LMArena Chinese | 1496 | — |
| LMArena French | 1456 | — |
| LMArena German | 1446 | — |
| LMArena Japanese | 1428 | — |
| LMArena Korean | 1404 | — |
| LMArena Russian | 1448 | — |
| LMArena Spanish | 1450 | — |
Instruction Following Not comparable
Grok 4.5: 76.0 (#48), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1446 | — |
Long Context Not comparable
Grok 4.5: 44.8 (#56), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1463 | — |
Writing & Preference Not comparable
Grok 4.5: 65.8 (#42), Hy4 preview: —
| Benchmark | Grok 4.5 | Hy4 preview |
|---|---|---|
| LMArena Text | 1448 | — |
| LMArena Creative Writing | 1442 | — |
| EQ-Bench Creative Writing | 1579 | — |
| LMArena Multi-Turn | 1456 | — |
Frequently asked questions
Is Grok 4.5 better than Hy4 preview?
Grok 4.5 is the stronger model overall, scoring 55.0 to 45.3 on the Noometry Index. Hy4 preview costs 2.4× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Which is cheaper, Grok 4.5 or Hy4 preview?
Hy4 preview is cheaper. It lists at $0.83 per million input tokens and $2.50 per million output tokens; Grok 4.5 lists at $2 and $6.
Is Grok 4.5 or Hy4 preview better for coding?
They score almost the same on coding (52.2 vs 51.6); test both on your own repository before choosing.
Which has the bigger context window?
Hy4 preview does, with 1.05M tokens against 500K.
How many benchmarks do Grok 4.5 and Hy4 preview share?
3 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Hy4 preview has 3.