Hy4 vs Solar Pro 4
Hy4 leads Solar Pro 4 on the Artificial Analysis Intelligence Index, 34.6 to 28.2, and Solar Pro 4 costs 2.1x less per output token ($0.60 vs $1.2505 per million). Updated November 14, 2026; 11 benchmarks have a result for both.
Hy4 or Solar Pro 4: which to pick
Only Hy4 has a coding score, 65.2 on the Vibe Coding Index; Solar Pro 4 has none, so the two cannot be ranked on coding.
Pick Solar Pro 4 for output tokens 2.1x cheaper ($0.60 vs $1.2505 per million).
- Shared results
- 11
- Hy4 only
- 8
- Solar Pro 4 only
- 40
- Like-for-like categories
- 5 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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, six public coding benchmarks
No call
Only Hy4 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Hy4
Hy4 leads, 34.6 against 28.2.
Same board, both measured
Web design
Design Arena: websites
Hy4
Hy4 leads, 1251 against 1163.
Same board, both measured
General
Vals Index
No call
Only Hy4 has a Vals Index result, 59.4%.
Directional only
Long documents
Listed context window
Hy4
Hy4 takes 1.05M tokens against 524K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Solar Pro 4
Hy4 $0.0010, Solar Pro 4 $0.0004 per turn.
List prices
At a glance
- Coding index
- Hy4 65.2 from 2 benchmarks, Solar Pro 4 not benchmarked.
- Widest category
- Coding, 32.4 points apart on average over 2 shared benchmarks.
- Widest single gap
- Terminal-Bench 4.0 (Artificial Analysis run): Hy4 37.4% against Solar Pro 4 0.0%, 37.4 points apart on a 0 to 100 scale.
- Output price
- Hy4 $1.2505 against Solar Pro 4 $0.60 per million output tokens, 2.1x apart.
- Context window
- Hy4 takes 1.05M tokens, Solar Pro 4 524K.
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 | Hy4 | Bars | Solar Pro 4 | Ties |
|---|---|---|---|---|
| Coding | 2 | 0 | ||
| Intelligence | 1 | 0 | ||
| Reasoning | 2 | 0 | ||
| Knowledge | 1 | 0 | ||
| Web design | 5 | 0 | ||
| All shared boards | 11 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1369 | Only Solar Pro 4 measured |
| AA Coding Index | Not measured | 52.7 | Only Solar Pro 4 measured |
| Terminal-Bench 4 (Vals AI) | 39.4% | Not measured | Only Hy4 measured |
| Vibe Code Bench (Vals AI) | 81.0% | Not measured | Only Hy4 measured |
| SciCode | Not measured | 48.0% | Only Solar Pro 4 measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 37.4% | 0.0% | Hy4 |
| FrontierCode 2.0 | 31.4% | 4.1% | Hy4 |
| ALE-Bench | Not measured | 179.3 | Only Solar Pro 4 measured |
| LMArena Text: coding | Not measured | 1437 | Only Solar Pro 4 measured |
| LMArena Text: software and IT | Not measured | 1428 | Only Solar Pro 4 measured |
| LMArena WebDev: React | Not measured | 1361 | Only Solar Pro 4 measured |
| LMArena WebDev: HTML | Not measured | 1371 | Only Solar Pro 4 measured |
| GameBench 2 | 48.7 | Not measured | Only Hy4 measured |
| Terminal-Bench 4.0 | 39.1% | Not measured | Only Hy4 measured |
| Neither model has a result on the other 38 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| AA Intelligence Index | 34.6 | 28.2 | Hy4 |
| Neither model has a result on the other 1 board here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | Not measured | 1081 | Only Solar Pro 4 measured |
| Tax Agent Bench (Vals AI) | 34.4% | Not measured | Only Hy4 measured |
| Legal Research Bench (Vals AI) | 41.4% | Not measured | Only Hy4 measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 12.5% | Not measured | Only Hy4 measured |
| Neither model has a result on the other 40 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| GPQA Diamond (Artificial Analysis run) | Not measured | 89.1% | Only Solar Pro 4 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 29.8% | Only Solar Pro 4 measured |
| HLE-Diamond (Artificial Analysis run) | 32.7% | 4.7% | Hy4 |
| CritPt v2, hard subset (Artificial Analysis run) | 39.0% | 18.0% | Hy4 |
| LMArena Text: hard prompts | Not measured | 1399 | Only Solar Pro 4 measured |
| LMArena Text: expert | Not measured | 1425 | Only Solar Pro 4 measured |
| LMArena Text: hard prompts in English | Not measured | 1428 | Only Solar Pro 4 measured |
| Neither model has a result on the other 19 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| LMArena Text: math | Not measured | 1416 | Only Solar Pro 4 measured |
| LMArena Text: mathematical work | Not measured | 1424 | Only Solar Pro 4 measured |
| Neither model has a result on the other 12 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| AA-Omniscience | 5.4 | 1.4 | Hy4 |
| LMArena Text: science | Not measured | 1402 | Only Solar Pro 4 measured |
| LMArena Text: medicine and healthcare | Not measured | 1376 | Only Solar Pro 4 measured |
| LMArena Text: legal and government | Not measured | 1386 | Only Solar Pro 4 measured |
| LMArena Text: business and finance | Not measured | 1380 | Only Solar Pro 4 measured |
| Neither model has a result on the other 16 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| Design Arena: websites | 1251 | 1163 | Hy4 |
| Design Arena: UI components | 1197 | 1140 | Hy4 |
| Design Arena: game dev | 1271 | 1168 | Hy4 |
| Design Arena: data viz | Not measured | 1174 | Only Solar Pro 4 measured |
| Design Arena: 3D | 1251 | 1159 | Hy4 |
| Design Arena: all code categories | 1254 | 1170 | Hy4 |
| Neither model has a result on the other 3 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index20 boards, none shared
| Benchmark | Hy4 | Solar Pro 4 | Leader |
|---|---|---|---|
| Vals Index | 59.4% | Not measured | Only Hy4 measured |
| Long context reasoning (AA-LCR) | Not measured | 70.7% | Only Solar Pro 4 measured |
| GDPval-AA | Not measured | 1106 | Only Solar Pro 4 measured |
| LMArena Text | Not measured | 1388 | Only Solar Pro 4 measured |
| LMArena Text: instruction following | Not measured | 1375 | Only Solar Pro 4 measured |
| LMArena Text: creative writing | Not measured | 1317 | Only Solar Pro 4 measured |
| LMArena Text: English | Not measured | 1415 | Only Solar Pro 4 measured |
| LMArena Text: non-English | Not measured | 1362 | Only Solar Pro 4 measured |
| LMArena Text: Chinese | Not measured | 1428 | Only Solar Pro 4 measured |
| LMArena Text: German | Not measured | 1351 | Only Solar Pro 4 measured |
| LMArena Text: Japanese | Not measured | 1323 | Only Solar Pro 4 measured |
| LMArena Text: Korean | Not measured | 1382 | Only Solar Pro 4 measured |
| LMArena Text: French | Not measured | 1409 | Only Solar Pro 4 measured |
| LMArena Text: Spanish | Not measured | 1412 | Only Solar Pro 4 measured |
| LMArena Text: Russian | Not measured | 1353 | Only Solar Pro 4 measured |
| LMArena Text: Polish | Not measured | 1302 | Only Solar Pro 4 measured |
| LMArena Text: multi-turn | Not measured | 1389 | Only Solar Pro 4 measured |
| LMArena Text: longer queries | Not measured | 1380 | Only Solar Pro 4 measured |
| LMArena Text: writing and language | Not measured | 1344 | Only Solar Pro 4 measured |
| LMArena Text: entertainment and media | Not measured | 1330 | Only Solar Pro 4 measured |
| Neither model has a result on the other 29 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Hy4 | Solar Pro 4 | 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
Solar Pro 4 costs less
Repository review
50K input + 3K output tokens
Solar Pro 4 costs less
Agent loop
200K input + 10K output tokens
Solar Pro 4 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 | Tencent Hy4 | Upstage Solar Pro 4 |
|---|---|---|
| Maker | Tencent | Upstage |
| Weights | Open weights | No public weights listed |
| Released | November 4, 2026 | August 10, 2026 |
| Context window | 1.05M | 524K |
| Input $/Mtok | $0.417 | $0.15 |
| Output $/Mtok | $1.2505 | $0.60 |
| Coding index | 65.2 | Not benchmarked |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Hy4 better than Solar Pro 4 for coding?
Only Hy4 has a coding score, 65.2 on the Vibe Coding Index; Solar Pro 4 has none, so the two cannot be ranked on coding. Pick Solar Pro 4 for output tokens 2.1x cheaper ($0.60 vs $1.2505 per million).
Which is cheaper, Hy4 or Solar Pro 4?
Hy4 costs $0.417 per million input tokens and $1.2505 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for neither of them.
Which has the bigger context window, Hy4 or Solar Pro 4?
Hy4, with 1.05M tokens against 524K.
How many benchmarks is the Hy4 vs Solar Pro 4 comparison based on?
11 benchmarks have a result for both models as of November 14, 2026. Hy4's coding index rests on 2 independent benchmarks and Solar Pro 4's on 1. Where only one model has a result, the page says so instead of naming a winner.