Claude Sonnet 4.5 vs Hy3
Updated October 21, 2026. 39 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Claude Sonnet 4.5 for coding: it scores 59.1 on the Vibe Coding Index against 43.9 for Hy3.
Pick Hy3 when output tokens cost 28.4x less, or when what matters is LMArena WebDev or LMArena WebDev: React, where it leads.
- Shared results
- 39
- Claude Sonnet 4.5 only
- 53
- Hy3 only
- 5
- 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
Claude Sonnet 4.5
Claude Sonnet 4.5 scores 59.1 against 43.9.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Claude Sonnet 4.5 has a AA Intelligence Index result, 20.7.
Directional only
Agentic work
AA Agentic Index
No call
Only Claude Sonnet 4.5 has a AA Agentic Index result, 15.8.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Sonnet 4.5 has a GPQA Diamond result, 81.6%.
Directional only
Math
AIME
No call
Only Claude Sonnet 4.5 has a AIME result, 88.2%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Sonnet 4.5 has a MMLU Pro result, 87.4%.
Directional only
Web design
Design Arena: websites
Hy3
Hy3 leads, 1230 against 1190.
Same board, both measured
Long documents
Listed context window
Claude Sonnet 4.5
Claude Sonnet 4.5 takes 1M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Hy3
Claude Sonnet 4.5 $0.011, Hy3 $0.0004 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Sonnet 4.5 has the number, $1.16.
Directional only
At a glance
- Coding index
- Claude Sonnet 4.5 59.1 from 2 benchmarks, Hy3 43.9 from 1 benchmark.
- Widest category
- Coding, 11.4 points apart on average over 5 shared benchmarks.
- Widest single gap
- LMArena WebDev: React: Claude Sonnet 4.5 1386 against Hy3 1511, 20.8 points apart on a 0 to 100 scale.
- Output price
- Claude Sonnet 4.5 $15.00 against Hy3 $0.528 per million output tokens, 28.4x apart.
- Context window
- Claude Sonnet 4.5 takes 1M 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 | Claude Sonnet 4.5 | Bars | Hy3 | Ties |
|---|---|---|---|---|
| Coding | 2 | 3 | ||
| Reasoning | 3 | 0 | ||
| Math | 0 | 2 | ||
| Knowledge | 2 | 2 | ||
| Web design | 2 | 6 | ||
| General | 12 | 5 | ||
| All shared boards | 21 | 18 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index23
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| SWE-bench Verified | 74.8% | Not measured | Only Claude Sonnet 4.5 measured |
| SWE-bench Multilingual | 67.0% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena WebDev | 1394 | 1507 | Hy3 |
| AA Coding Index | 52.1 | Not measured | Only Claude Sonnet 4.5 measured |
| LiveCodeBench (Vals AI) | 73.0% | Not measured | Only Claude Sonnet 4.5 measured |
| SWE-bench Verified (Vals AI) | 70.0% | Not measured | Only Claude Sonnet 4.5 measured |
| Vibe Code Bench (Vals AI) | 22.6% | Not measured | Only Claude Sonnet 4.5 measured |
| SciCode | Not measured | 48.6% | Only Hy3 measured |
| Terminal-Bench | 46.5% | Not measured | Only Claude Sonnet 4.5 measured |
| GSO-Bench | 14.7% | Not measured | Only Claude Sonnet 4.5 measured |
| WeirdML | 47.7% | Not measured | Only Claude Sonnet 4.5 measured |
| Cybench | 60.0% | Not measured | Only Claude Sonnet 4.5 measured |
| ALE-Bench | Not measured | 838.6 | Only Hy3 measured |
| LMArena Text: coding | 1488 | 1466 | Claude Sonnet 4.5 |
| LMArena Text: software and IT | 1473 | 1463 | Claude Sonnet 4.5 |
| LMArena WebDev: React | 1386 | 1511 | Hy3 |
| LMArena WebDev: HTML | 1399 | 1487 | Hy3 |
| Neither model has a result on the other 21 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 20.7 | Not measured | Only Claude Sonnet 4.5 measured |
| Epoch Capabilities Index | 146.7 | Not measured | Only Claude Sonnet 4.5 measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| AA Agentic Index | 15.8 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building web apps | 1060 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building full-stack apps | 1050 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building mobile apps | 1137 | Not measured | Only Claude Sonnet 4.5 measured |
| METR time horizons | 67.4% | Not measured | Only Claude Sonnet 4.5 measured |
| Remote Labor Index | 2.1% | Not measured | Only Claude Sonnet 4.5 measured |
| GDPval | 42.5% | Not measured | Only Claude Sonnet 4.5 measured |
| DeepResearch Bench | 52.6% | Not measured | Only Claude Sonnet 4.5 measured |
| OSWorld | 62.9% | Not measured | Only Claude Sonnet 4.5 measured |
| Vending-Bench 2 | $3,839 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 29 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| GPQA Diamond | 81.6% | Not measured | Only Claude Sonnet 4.5 measured |
| MMMU Pro (Vals AI) | 79.3% | Not measured | Only Claude Sonnet 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 89.7% | Only Hy3 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 33.5% | Only Hy3 measured |
| GPQA Diamond (Epoch AI run) | 82.3% | Not measured | Only Claude Sonnet 4.5 measured |
| ARC-AGI | 63.7% | Not measured | Only Claude Sonnet 4.5 measured |
| ARC-AGI-2 | 13.6% | Not measured | Only Claude Sonnet 4.5 measured |
| SimpleBench | 54.3% | Not measured | Only Claude Sonnet 4.5 measured |
| Chess puzzles | 10.0% | Not measured | Only Claude Sonnet 4.5 measured |
| Mystery game puzzles | 17.0% | Not measured | Only Claude Sonnet 4.5 measured |
| EBR-bench | 2.4% | Not measured | Only Claude Sonnet 4.5 measured |
| VPCT | 39.8% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: hard prompts | 1462 | 1447 | Claude Sonnet 4.5 |
| LMArena Text: expert | 1483 | 1461 | Claude Sonnet 4.5 |
| LMArena Text: hard prompts in English | 1471 | 1455 | Claude Sonnet 4.5 |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| AIME | 88.2% | Not measured | Only Claude Sonnet 4.5 measured |
| MGSM (Vals AI) | 94.3% | Not measured | Only Claude Sonnet 4.5 measured |
| OTIS Mock AIME | 77.8% | Not measured | Only Claude Sonnet 4.5 measured |
| FrontierMath, tiers 1 to 3 | 23.9% | Not measured | Only Claude Sonnet 4.5 measured |
| FrontierMath, tier 4 | 2.4% | Not measured | Only Claude Sonnet 4.5 measured |
| ProofBench | 19.0% | Not measured | Only Claude Sonnet 4.5 measured |
| MATH level 5 | 97.7% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: math | 1449 | 1473 | Hy3 |
| LMArena Text: mathematical work | 1462 | 1482 | Hy3 |
| Neither model has a result on the other 4 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index22
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| MMLU Pro | 87.4% | Not measured | Only Claude Sonnet 4.5 measured |
| LegalBench (Vals AI) | 84.1% | Not measured | Only Claude Sonnet 4.5 measured |
| CaseLaw (Vals AI) | 62.2% | Not measured | Only Claude Sonnet 4.5 measured |
| CorpFin (Vals AI) | 62.0% | Not measured | Only Claude Sonnet 4.5 measured |
| TaxEval (Vals AI) | 73.3% | Not measured | Only Claude Sonnet 4.5 measured |
| MortgageTax (Vals AI) | 64.0% | Not measured | Only Claude Sonnet 4.5 measured |
| MedQA (Vals AI) | 94.7% | Not measured | Only Claude Sonnet 4.5 measured |
| MedCode (Vals AI) | 44.1% | Not measured | Only Claude Sonnet 4.5 measured |
| SimpleQA Verified | 30.7% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: science | 1448 | 1457 | Hy3 |
| LMArena Text: medicine and healthcare | 1444 | 1452 | Hy3 |
| LMArena Text: legal and government | 1451 | 1422 | Claude Sonnet 4.5 |
| LMArena Text: business and finance | 1440 | 1424 | Claude Sonnet 4.5 |
| Neither model has a result on the other 4 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index26
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1190 | 1230 | Hy3 |
| Design Arena: UI components | 1173 | 1205 | Hy3 |
| Design Arena: game dev | 1166 | 1208 | Hy3 |
| Design Arena: data viz | 1167 | 1163 | Claude Sonnet 4.5 |
| Design Arena: 3D | 1158 | 1233 | Hy3 |
| Design Arena: all code categories | 1183 | 1227 | Hy3 |
| Design Arena: SVG | 1114 | 1199 | Hy3 |
| Design Arena: ASCII art | 1204 | 1157 | Claude Sonnet 4.5 |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index125
| Benchmark | Claude Sonnet 4.5 | Hy3 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 36.1% | Not measured | Only Claude Sonnet 4.5 measured |
| MedScribe (Vals AI) | 84.5% | Not measured | Only Claude Sonnet 4.5 measured |
| Long context reasoning (AA-LCR) | Not measured | 79.0% | Only Hy3 measured |
| DTBench | 83.2% | Not measured | Only Claude Sonnet 4.5 measured |
| LMCA | 38.8% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text | 1438 | 1438 | Claude Sonnet 4.5 |
| LMArena Text: instruction following | 1459 | 1426 | Claude Sonnet 4.5 |
| LMArena Text: creative writing | 1442 | 1403 | Claude Sonnet 4.5 |
| LMArena Text: English | 1450 | 1448 | Claude Sonnet 4.5 |
| LMArena Text: non-English | 1425 | 1426 | Hy3 |
| LMArena Text: Chinese | 1460 | 1485 | Hy3 |
| LMArena Text: German | 1427 | 1449 | Hy3 |
| LMArena Text: Japanese | 1390 | 1397 | Hy3 |
| LMArena Text: Korean | 1402 | 1396 | Claude Sonnet 4.5 |
| LMArena Text: French | 1459 | 1456 | Claude Sonnet 4.5 |
| LMArena Text: Spanish | 1458 | 1457 | Claude Sonnet 4.5 |
| LMArena Text: Russian | 1437 | 1432 | Claude Sonnet 4.5 |
| LMArena Text: Polish | 1423 | 1447 | Hy3 |
| LMArena Text: multi-turn | 1465 | 1436 | Claude Sonnet 4.5 |
| LMArena Text: longer queries | 1475 | 1442 | Claude Sonnet 4.5 |
| LMArena Text: writing and language | 1442 | 1414 | Claude Sonnet 4.5 |
| LMArena Text: entertainment and media | 1428 | 1400 | Claude Sonnet 4.5 |
| LMArena Document | 1450 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 23 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Sonnet 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 | Anthropic Claude Sonnet 4.5 | Tencent Hy3 |
|---|---|---|
| Maker | Anthropic | Tencent |
| Weights | No public weights listed | Open weights |
| Released | September 29, 2025 | July 6, 2026 |
| Context window | 1M | 262K |
| Input $/Mtok | $3.00 | $0.132 |
| Output $/Mtok | $15.00 | $0.528 |
| Coding index | 59.1 | 43.9 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $1.16 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Sonnet 4.5 better than Hy3 for coding?
Pick Claude Sonnet 4.5 for coding: it scores 59.1 on the Vibe Coding Index against 43.9 for Hy3. Pick Hy3 when output tokens cost 28.4x less, or when what matters is LMArena WebDev or LMArena WebDev: React, where it leads.
Which is cheaper, Claude Sonnet 4.5 or Hy3?
Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; Hy3 costs $0.132 and $0.528. Cost per solved task is known for Claude Sonnet 4.5 only.
Which has the bigger context window, Claude Sonnet 4.5 or Hy3?
Claude Sonnet 4.5, with 1M tokens against 262K.
How many benchmarks is the Claude Sonnet 4.5 vs Hy3 comparison based on?
39 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 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.