Gemini 4 Hydrogen vs Hy4
Gemini 4 Hydrogen leads Hy4 on coding, 77.9 to 65.2 on the Vibe Coding Index, and Hy4 costs 6.0x less per output token ($1.2505 vs $7.50 per million). Updated November 14, 2026; 15 benchmarks have a result for both.
Gemini 4 Hydrogen or Hy4: which to pick
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 65.2 for Hy4.
Pick Hy4 for output tokens 6.0x cheaper ($1.2505 vs $7.50 per million) and work measured by Harvey's Legal Agent Benchmark (Vals AI), where it leads.
- Shared results
- 15
- Gemini 4 Hydrogen only
- 35
- Hy4 only
- 4
- Like-for-like categories
- 6 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
Gemini 4 Hydrogen
Gemini 4 Hydrogen scores 77.9 against 65.2.
4 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Hy4 has a AA Intelligence Index result, 34.6.
Directional only
Web design
Design Arena: websites
Gemini 4 Hydrogen
Gemini 4 Hydrogen leads, 1320 against 1251.
Same board, both measured
General
Vals Index
Gemini 4 Hydrogen
Gemini 4 Hydrogen leads, 68.5% against 59.4%.
Same board, both measured
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Hy4
Gemini 4 Hydrogen $0.0053, Hy4 $0.0010 per turn.
List prices
At a glance
- Coding index
- Gemini 4 Hydrogen 77.9 from 4 benchmarks, Hy4 65.2 from 2 benchmarks.
- Widest category
- Reasoning, 26.5 points apart on average over 2 shared benchmarks.
- Widest single gap
- CritPt v2, hard subset (Artificial Analysis run): Gemini 4 Hydrogen 66.0% against Hy4 39.0%, 27.0 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Hydrogen $7.50 against Hy4 $1.2505 per million output tokens, 6.0x apart.
- Context window
- Both take 1.05M tokens.
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 | Gemini 4 Hydrogen | Bars | Hy4 | Ties |
|---|---|---|---|---|
| Coding | 4 | 0 | ||
| Agentic work | 2 | 1 | ||
| Reasoning | 2 | 0 | ||
| Knowledge | 1 | 0 | ||
| Web design | 4 | 0 | ||
| General | 1 | 0 | ||
| All shared boards | 14 | 1 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index40
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| LiveBench coding | 78.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev | 1704 | Not measured | Only Gemini 4 Hydrogen measured |
| Terminal-Bench 4 (Vals AI) | 54.0% | 39.4% | Gemini 4 Hydrogen |
| Vibe Code Bench (Vals AI) | 87.8% | 81.0% | Gemini 4 Hydrogen |
| Terminal-Bench 4.0 (Artificial Analysis run) | 54.0% | 37.4% | Gemini 4 Hydrogen |
| FrontierCode 2.0 | 39.0% | 31.4% | Gemini 4 Hydrogen |
| LMArena Text: coding | 1516 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: software and IT | 1513 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev: React | 1724 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev: HTML | 1743 | Not measured | Only Gemini 4 Hydrogen measured |
| GameBench 2 | Not measured | 48.7 | Only Hy4 measured |
| Terminal-Bench 4.0 | Not measured | 39.1% | Only Hy4 measured |
| CursorBench 4.0 | 57.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 39 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 34.6 | Only Hy4 measured |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index21
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| LiveBench research | 86.8% | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench browser | 77.1% | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench long agentic | 61.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Tax Agent Bench (Vals AI) | 52.3% | 34.4% | Gemini 4 Hydrogen |
| Legal Research Bench (Vals AI) | 53.8% | 41.4% | Gemini 4 Hydrogen |
| Harvey's Legal Agent Benchmark (Vals AI) | 11.3% | 12.5% | Hy4 |
| Neither model has a result on the other 38 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.6% | Not measured | Only Gemini 4 Hydrogen measured |
| HLE-Diamond (Artificial Analysis run) | 58.8% | 32.7% | Gemini 4 Hydrogen |
| CritPt v2, hard subset (Artificial Analysis run) | 66.0% | 39.0% | Gemini 4 Hydrogen |
| LMArena Text: hard prompts | 1520 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: expert | 1558 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: hard prompts in English | 1514 | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 20 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| LMArena Text: math | 1507 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: mathematical work | 1534 | Not measured | Only Gemini 4 Hydrogen 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 | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| AA-Omniscience | 46.3 | 5.4 | Gemini 4 Hydrogen |
| LMArena Text: science | 1519 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: medicine and healthcare | 1488 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: legal and government | 1532 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: business and finance | 1486 | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 16 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| Design Arena: websites | 1320 | 1251 | Gemini 4 Hydrogen |
| Design Arena: UI components | Not measured | 1197 | Only Hy4 measured |
| Design Arena: game dev | 1369 | 1271 | Gemini 4 Hydrogen |
| Design Arena: 3D | 1415 | 1251 | Gemini 4 Hydrogen |
| Design Arena: all code categories | 1333 | 1254 | Gemini 4 Hydrogen |
| LiveBench design | 77.3% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 3 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 4 Hydrogen | Hy4 | Leader |
|---|---|---|---|
| Vals Index | 68.5% | 59.4% | Gemini 4 Hydrogen |
| LiveBench data analysis | 83.2% | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text | 1502 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: instruction following | 1519 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: creative writing | 1509 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: English | 1499 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: non-English | 1495 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: Chinese | 1631 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: French | 1512 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: Spanish | 1494 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: Russian | 1492 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: multi-turn | 1485 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: longer queries | 1524 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: writing and language | 1500 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: entertainment and media | 1503 | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 34 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Hy4 | 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
Hy4 costs less
Repository review
50K input + 3K output tokens
Hy4 costs less
Agent loop
200K input + 10K output tokens
Hy4 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 | Google Gemini 4 Hydrogen | Tencent Hy4 |
|---|---|---|
| Maker | Tencent | |
| Weights | No public weights listed | Open weights |
| Released | November 12, 2026 | November 4, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.50 | $0.417 |
| Output $/Mtok | $7.50 | $1.2505 |
| Coding index | 77.9 | 65.2 |
| Independent measurements behind it | 4 | 2 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Hydrogen better than Hy4 for coding?
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 65.2 for Hy4. Pick Hy4 for output tokens 6.0x cheaper ($1.2505 vs $7.50 per million) and work measured by Harvey's Legal Agent Benchmark (Vals AI), where it leads.
Which is cheaper, Gemini 4 Hydrogen or Hy4?
Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; Hy4 costs $0.417 and $1.2505. Cost per solved task is known for neither of them.
Which has the bigger context window, Gemini 4 Hydrogen or Hy4?
Neither: both take 1.05M tokens.
How many benchmarks is the Gemini 4 Hydrogen vs Hy4 comparison based on?
15 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 independent benchmarks and Hy4's on 2. Where only one model has a result, the page says so instead of naming a winner.