Grok 4.5 vs Hy3
Updated October 21, 2026. 44 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Grok 4.5 for coding: it scores 75.5 on the Vibe Coding Index against 43.9 for Hy3.
Pick Hy3 when output tokens cost 11.4x less, or when what matters is LMArena Text: math or LMArena Text: mathematical work, where it leads.
- Shared results
- 44
- Grok 4.5 only
- 76
- Hy3 only
- 0
- Like-for-like categories
- 6 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, four public coding benchmarks
Grok 4.5
Grok 4.5 scores 75.5 against 43.9.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Grok 4.5 has a AA Intelligence Index result, 38.8.
Directional only
Agentic work
AA Agentic Index
No call
Only Grok 4.5 has a AA Agentic Index result, 41.2.
Directional only
Reasoning
GPQA Diamond
No call
Only Grok 4.5 has a GPQA Diamond result, 92.9%.
Directional only
Knowledge
MMLU Pro
No call
Only Grok 4.5 has a MMLU Pro result, 89.2%.
Directional only
Web design
Design Arena: websites
Grok 4.5
Grok 4.5 leads, 1281 against 1230.
Same board, both measured
Long documents
Listed context window
Grok 4.5
Grok 4.5 takes 500K tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Hy3
Grok 4.5 $0.0050, Hy3 $0.0004 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Grok 4.5 has the number, $0.62.
Directional only
At a glance
- Coding index
- Grok 4.5 75.5 from 2 benchmarks, Hy3 43.9 from 1 benchmark.
- Widest category
- Coding, 7.5 points apart on average over 7 shared benchmarks.
- Widest single gap
- ALE-Bench: Grok 4.5 1309.3 against Hy3 838.6, 15.7 points apart on a 0 to 100 scale.
- Output price
- Grok 4.5 $6.00 against Hy3 $0.528 per million output tokens, 11.4x apart.
- Context window
- Grok 4.5 takes 500K tokens, Hy3 262K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Grok 4.5 | Bars | Hy3 | Ties |
|---|---|---|---|---|
| Coding | 7 | 0 | ||
| Reasoning | 5 | 0 | ||
| Math | 0 | 2 | ||
| Knowledge | 3 | 1 | ||
| Web design | 8 | 0 | ||
| General | 15 | 3 | ||
| All shared boards | 38 | 6 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index70
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| LiveBench coding | 94.3% | Not measured | Only Grok 4.5 measured |
| LMArena WebDev | 1553 | 1507 | Grok 4.5 |
| AA Coding Index | 72.4 | Not measured | Only Grok 4.5 measured |
| LiveCodeBench (Vals AI) | 87.3% | Not measured | Only Grok 4.5 measured |
| SWE-bench Verified (Vals AI) | 86.6% | Not measured | Only Grok 4.5 measured |
| Terminal-Bench 4 (Vals AI) | 8.6% | Not measured | Only Grok 4.5 measured |
| Vibe Code Bench (Vals AI) | 69.0% | Not measured | Only Grok 4.5 measured |
| Code migration (Vals AI) | 36.6% | Not measured | Only Grok 4.5 measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Grok 4.5 measured |
| IOI (Vals AI) | 40.6% | Not measured | Only Grok 4.5 measured |
| Terminal-Bench 2.1 (Vals AI) | 67.8% | Not measured | Only Grok 4.5 measured |
| SkillsBench (Vals AI) | 66.0% | Not measured | Only Grok 4.5 measured |
| CyberBench (Vals AI) | 71.0% | Not measured | Only Grok 4.5 measured |
| SciCode | 55.0% | 48.6% | Grok 4.5 |
| FrontierCode | 42.4% | Not measured | Only Grok 4.5 measured |
| WeirdML | 46.4% | Not measured | Only Grok 4.5 measured |
| ALE-Bench | 1309.3 | 838.6 | Grok 4.5 |
| LMArena Text: coding | 1474 | 1466 | Grok 4.5 |
| LMArena Text: software and IT | 1471 | 1463 | Grok 4.5 |
| LMArena WebDev: React | 1556 | 1511 | Grok 4.5 |
| LMArena WebDev: HTML | 1567 | 1487 | Grok 4.5 |
| LMArena WebDev: from an image | 1562 | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 16 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 38.8 | Not measured | Only Grok 4.5 measured |
| Epoch Capabilities Index | 154.1 | Not measured | Only Grok 4.5 measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index22 boards, none shared
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| AA Agentic Index | 41.2 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building web apps | 1217 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building full-stack apps | 1249 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building mobile apps | 1221 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building Android apps | 1242 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building Godot games | 1229 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building games | 1235 | Not measured | Only Grok 4.5 measured |
| Design Arena: HTML slides | 1204 | Not measured | Only Grok 4.5 measured |
| Design Arena: PowerPoint slides | 1232 | Not measured | Only Grok 4.5 measured |
| LiveBench research | 85.9% | Not measured | Only Grok 4.5 measured |
| LiveBench browser | 44.0% | Not measured | Only Grok 4.5 measured |
| LiveBench long agentic | 27.9% | Not measured | Only Grok 4.5 measured |
| SREBench (Vals AI) | 0.8% | Not measured | Only Grok 4.5 measured |
| Finance Agent (Vals AI) | 48.4% | Not measured | Only Grok 4.5 measured |
| Tax Agent Bench (Vals AI) | 24.9% | Not measured | Only Grok 4.5 measured |
| Legal Research Bench (Vals AI) | 38.0% | Not measured | Only Grok 4.5 measured |
| Excel Modeling Benchmark (Vals AI) | 52.9% | Not measured | Only Grok 4.5 measured |
| Time Horizon Index (Vals AI) | 6.3% | Not measured | Only Grok 4.5 measured |
| APEX-Agents | 56.2% | Not measured | Only Grok 4.5 measured |
| PostTrainBench | 23.4% | Not measured | Only Grok 4.5 measured |
| Vending-Bench 2 | $3,887 | Not measured | Only Grok 4.5 measured |
| LMArena Search | 1216 | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 17 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| GPQA Diamond | 92.9% | Not measured | Only Grok 4.5 measured |
| LiveBench reasoning | 87.2% | Not measured | Only Grok 4.5 measured |
| MMMU Pro (Vals AI) | 61.8% | Not measured | Only Grok 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | 93.1% | 89.7% | Grok 4.5 |
| Humanity's Last Exam (Artificial Analysis run) | 42.7% | 33.5% | Grok 4.5 |
| GPQA Diamond (Epoch AI run) | 93.4% | Not measured | Only Grok 4.5 measured |
| ARC-AGI | 87.2% | Not measured | Only Grok 4.5 measured |
| ARC-AGI-2 | 52.6% | Not measured | Only Grok 4.5 measured |
| SimpleBench | 70.0% | Not measured | Only Grok 4.5 measured |
| Chess puzzles | 35.0% | Not measured | Only Grok 4.5 measured |
| LMArena Text: hard prompts | 1462 | 1447 | Grok 4.5 |
| LMArena Text: expert | 1465 | 1461 | Grok 4.5 |
| LMArena Text: hard prompts in English | 1464 | 1455 | Grok 4.5 |
| LMArena Vision: diagrams | 1304 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: homework | 1295 | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| OTIS Mock AIME | 97.8% | Not measured | Only Grok 4.5 measured |
| FrontierMath, tiers 1 to 3 | 57.2% | Not measured | Only Grok 4.5 measured |
| FrontierMath, tier 4 | 24.4% | Not measured | Only Grok 4.5 measured |
| ProofBench | 31.0% | Not measured | Only Grok 4.5 measured |
| LMArena Text: math | 1460 | 1473 | Hy3 |
| LMArena Text: mathematical work | 1482 | 1482 | Hy3 |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index31
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| MMLU Pro | 89.2% | Not measured | Only Grok 4.5 measured |
| LegalBench (Vals AI) | 86.0% | Not measured | Only Grok 4.5 measured |
| CorpFin (Vals AI) | 67.4% | Not measured | Only Grok 4.5 measured |
| TaxEval (Vals AI) | 71.7% | Not measured | Only Grok 4.5 measured |
| MortgageTax (Vals AI) | 61.8% | Not measured | Only Grok 4.5 measured |
| MedCode (Vals AI) | 43.3% | Not measured | Only Grok 4.5 measured |
| SimpleQA Verified | 48.3% | Not measured | Only Grok 4.5 measured |
| LMArena Text: science | 1464 | 1457 | Grok 4.5 |
| LMArena Text: medicine and healthcare | 1440 | 1452 | Hy3 |
| LMArena Text: legal and government | 1463 | 1422 | Grok 4.5 |
| LMArena Text: business and finance | 1441 | 1424 | Grok 4.5 |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1281 | 1230 | Grok 4.5 |
| Design Arena: UI components | 1279 | 1205 | Grok 4.5 |
| Design Arena: game dev | 1263 | 1208 | Grok 4.5 |
| Design Arena: data viz | 1267 | 1163 | Grok 4.5 |
| Design Arena: 3D | 1257 | 1233 | Grok 4.5 |
| Design Arena: all code categories | 1276 | 1227 | Grok 4.5 |
| Design Arena: SVG | 1215 | 1199 | Grok 4.5 |
| Design Arena: ASCII art | 1257 | 1157 | Grok 4.5 |
| LiveBench design | 78.1% | Not measured | Only Grok 4.5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index153
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| LiveBench data analysis | 73.0% | Not measured | Only Grok 4.5 measured |
| SAGE (Vals AI) | 35.0% | Not measured | Only Grok 4.5 measured |
| MedScribe (Vals AI) | 86.9% | Not measured | Only Grok 4.5 measured |
| Vals Multimodal Index | 63.4% | Not measured | Only Grok 4.5 measured |
| Long context reasoning (AA-LCR) | 79.3% | 79.0% | Grok 4.5 |
| DTBench | 96.5% | Not measured | Only Grok 4.5 measured |
| LMCA | 45.2% | Not measured | Only Grok 4.5 measured |
| Surface Evolver Bench | 74.4% | Not measured | Only Grok 4.5 measured |
| Furniture assembly | 22.5% | Not measured | Only Grok 4.5 measured |
| LMArena Text | 1448 | 1438 | Grok 4.5 |
| LMArena Text: instruction following | 1445 | 1426 | Grok 4.5 |
| LMArena Text: creative writing | 1442 | 1403 | Grok 4.5 |
| LMArena Vision | 1287 | Not measured | Only Grok 4.5 measured |
| LMArena Text: English | 1453 | 1448 | Grok 4.5 |
| LMArena Text: non-English | 1440 | 1426 | Grok 4.5 |
| LMArena Text: Chinese | 1495 | 1485 | Grok 4.5 |
| LMArena Text: German | 1448 | 1449 | Hy3 |
| LMArena Text: Japanese | 1430 | 1397 | Grok 4.5 |
| LMArena Text: Korean | 1406 | 1396 | Grok 4.5 |
| LMArena Text: French | 1457 | 1456 | Grok 4.5 |
| LMArena Text: Spanish | 1451 | 1457 | Hy3 |
| LMArena Text: Russian | 1449 | 1432 | Grok 4.5 |
| LMArena Text: Polish | 1432 | 1447 | Hy3 |
| LMArena Text: multi-turn | 1456 | 1436 | Grok 4.5 |
| LMArena Text: longer queries | 1462 | 1442 | Grok 4.5 |
| LMArena Text: writing and language | 1445 | 1414 | Grok 4.5 |
| LMArena Text: entertainment and media | 1434 | 1400 | Grok 4.5 |
| LMArena Vision: English | 1285 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: Chinese | 1345 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: reading text | 1293 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: humor | 1276 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: creative writing | 1293 | Not measured | Only Grok 4.5 measured |
| LMArena Document | 1452 | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 13 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Grok 4.5 | Hy3 | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Hy3 costs less
Repository review
50K input + 3K output tokens
Hy3 costs less
Agent loop
200K input + 10K output tokens
Hy3 costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | SpaceXAI Grok 4.5 | Tencent Hy3 |
|---|---|---|
| Maker | xAI | Tencent |
| Weights | No public weights listed | Open weights |
| Released | July 8, 2026 | July 6, 2026 |
| Context window | 500K | 262K |
| Input $/Mtok | $2.00 | $0.132 |
| Output $/Mtok | $6.00 | $0.528 |
| Coding index | 75.5 | 43.9 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $0.62 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Grok 4.5 better than Hy3 for coding?
Pick Grok 4.5 for coding: it scores 75.5 on the Vibe Coding Index against 43.9 for Hy3. Pick Hy3 when output tokens cost 11.4x less, or when what matters is LMArena Text: math or LMArena Text: mathematical work, where it leads.
Which is cheaper, Grok 4.5 or Hy3?
Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens; Hy3 costs $0.132 and $0.528. Cost per solved task is known for Grok 4.5 only.
Which has the bigger context window, Grok 4.5 or Hy3?
Grok 4.5, with 500K tokens against 262K.
How many benchmarks is the Grok 4.5 vs Hy3 comparison based on?
44 benchmarks have a result for both models as of October 21, 2026. Grok 4.5's coding index rests on 2 independent benchmarks and Hy3's on 1. Where only one model has a result, the page says so instead of naming a winner.