Model comparison
Grok 4 Fast vs Hy3
Hy3 is the stronger model overall, scoring 43.6 to 39.0 on the Noometry Index.
Last verified . 16 shared benchmarks.
TencentSummary
- They share 16 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Hy3 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 44.1.
- Hy3 has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Hy3 | |
|---|---|---|
| Provider | xAI | Tencent |
| Noometry Index | 39.0 | 43.6 |
| Released | 2025-09-19 | 2026-07-06 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 128K |
| Input $ / M tokens | — | $0.13 |
| Output $ / M tokens | — | $0.53 |
| Results tracked | 30 | 17 |
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Category by category
Coding Hy3 leads
Grok 4 Fast: 32.3 (#264), Hy3: 46.6 (#60)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena WebDev | 1160 | 1509 |
| LMArena Coding | 1429 | 1465 |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), Hy3: —
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Hy3 leads
Grok 4 Fast: 22.5 (#179), Hy3: 25.0 (#134)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1449 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| NYT Connections (extended) | — | 41.2% |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |
Math Hy3 leads
Grok 4 Fast: 36.1 (#126), Hy3: 37.4 (#98)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Math | 1419 | 1475 |
Knowledge Hy3 leads
Grok 4 Fast: 31.5 (#211), Hy3: 40.2 (#108)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Expert | 1411 | 1461 |
| Vectara Hallucination Rate | 19.7% | — |
Multilingual Hy3 leads
Grok 4 Fast: 51.5 (#106), Hy3: 53.7 (#60)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Non-English | 1397 | 1427 |
| LMArena Chinese | 1458 | 1496 |
| LMArena French | 1433 | 1461 |
| LMArena Korean | 1359 | 1390 |
| LMArena Russian | 1387 | 1435 |
| LMArena Spanish | 1414 | 1448 |
| LMArena German | 1383 | — |
| LMArena Japanese | 1358 | — |
Instruction Following Hy3 leads
Grok 4 Fast: 73.4 (#116), Hy3: 75.3 (#68)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Instruction Following | 1388 | 1425 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Hy3: 44.1 (#70)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Longer Query | 1415 | 1443 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Hy3 leads
Grok 4 Fast: 60.2 (#96), Hy3: 62.5 (#75)
| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Text | 1407 | 1442 |
| LMArena Creative Writing | 1388 | 1399 |
| LMArena Multi-Turn | 1414 | 1436 |
Frequently asked questions
Is Grok 4 Fast better than Hy3?
Hy3 is the stronger model overall, scoring 43.6 to 39.0 on the Noometry Index.
Is Grok 4 Fast or Hy3 better for coding?
Hy3 scores higher on coding benchmarks: 46.6 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Hy3 share?
16 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Hy3 has 17.