Gemini 4 Hydrogen vs Kimi K3.1 Pro
Kimi K3.1 Pro leads Gemini 4 Hydrogen on coding, 79.0 to 77.9 on the Vibe Coding Index, and Gemini 4 Hydrogen costs 1.3x less per output token ($7.50 vs $10.00 per million). Updated November 14, 2026; 47 benchmarks have a result for both.
Gemini 4 Hydrogen or Kimi K3.1 Pro: which to pick
Gemini 4 Hydrogen and Kimi K3.1 Pro are level for coding, 77.9 against 79.0 on the Vibe Coding Index, so price and context decide.
Pick Gemini 4 Hydrogen for output tokens 1.3x cheaper ($7.50 vs $10.00 per million) and work measured by LiveBench coding or LMArena WebDev, where it leads. Pick Kimi K3.1 Pro for work measured by Terminal-Bench 4 (Vals AI) or Terminal-Bench 4.0 (Artificial Analysis run), where it leads.
- Shared results
- 47
- Gemini 4 Hydrogen only
- 3
- Kimi K3.1 Pro only
- 32
- Like-for-like categories
- 7 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
Level: 77.9 against 79.0, inside 2 points.
4 benchmarks behind each score
Intelligence
AA Intelligence Index
No call
Only Kimi K3.1 Pro has a AA Intelligence Index result, 46.5.
Directional only
Web design
Design Arena: websites
Kimi K3.1 Pro
Kimi K3.1 Pro leads, 1321 against 1320.
Same board, both measured
General
Vals Index
Gemini 4 Hydrogen
Gemini 4 Hydrogen leads, 68.5% against 62.5%.
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
Gemini 4 Hydrogen
Gemini 4 Hydrogen $0.0053, Kimi K3.1 Pro $0.0070 per turn.
List prices
At a glance
- Coding index
- Gemini 4 Hydrogen 77.9 from 4 benchmarks, Kimi K3.1 Pro 79.0 from 4 benchmarks.
- Widest category
- Math, 13.8 points apart on average over 1 shared benchmark.
- Widest single gap
- Tax Agent Bench (Vals AI): Gemini 4 Hydrogen 52.3% against Kimi K3.1 Pro 24.9%, 27.4 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Hydrogen $7.50 against Kimi K3.1 Pro $10.00 per million output tokens, 1.3x 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 | Kimi K3.1 Pro | Ties |
|---|---|---|---|---|
| Coding | 8 | 2 | ||
| Agentic work | 5 | 1 | ||
| Reasoning | 5 | 1 | ||
| Math | 1 | 0 | ||
| Knowledge | 5 | 0 | ||
| Web design | 1 | 4 | ||
| General | 13 | 1 | ||
| All shared boards | 38 | 9 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index82
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| LiveBench coding | 78.5% | 67.8% | Gemini 4 Hydrogen |
| LMArena WebDev | 1704 | 1687 | Gemini 4 Hydrogen |
| Terminal-Bench 4 (Vals AI) | 54.0% | 63.6% | Kimi K3.1 Pro |
| Vibe Code Bench (Vals AI) | 87.8% | 84.9% | Gemini 4 Hydrogen |
| IOI (Vals AI) | Not measured | 81.9% | Only Kimi K3.1 Pro measured |
| SciCode | Not measured | 60.8% | Only Kimi K3.1 Pro measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 54.0% | 67.2% | Kimi K3.1 Pro |
| FrontierCode 2.0 | 39.0% | 25.5% | Gemini 4 Hydrogen |
| ALE-Bench | Not measured | 1932.8 | Only Kimi K3.1 Pro measured |
| LMArena Text: coding | 1516 | 1480 | Gemini 4 Hydrogen |
| LMArena Text: software and IT | 1513 | 1482 | Gemini 4 Hydrogen |
| LMArena WebDev: React | 1724 | 1699 | Gemini 4 Hydrogen |
| LMArena WebDev: HTML | 1743 | 1689 | Gemini 4 Hydrogen |
| GameBench 2 | Not measured | 84.0 | Only Kimi K3.1 Pro measured |
| Terminal-Bench 4.0 | Not measured | 60.9% | Only Kimi K3.1 Pro measured |
| CursorBench 4.0 | 57.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 36 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 46.5 | Only Kimi K3.1 Pro measured |
| Epoch Capabilities Index | Not measured | 161.4 | Only Kimi K3.1 Pro measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index51
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | Not measured | 1312 | Only Kimi K3.1 Pro measured |
| Design Arena: agents building full-stack apps | Not measured | 1321 | Only Kimi K3.1 Pro measured |
| Design Arena: agents building mobile apps | Not measured | 1268 | Only Kimi K3.1 Pro measured |
| Design Arena: agents building Android apps | Not measured | 1147 | Only Kimi K3.1 Pro measured |
| Design Arena: PowerPoint slides | Not measured | 1278 | Only Kimi K3.1 Pro measured |
| Design Arena: spreadsheets | Not measured | 1326 | Only Kimi K3.1 Pro measured |
| LiveBench research | 86.8% | 82.1% | Gemini 4 Hydrogen |
| LiveBench browser | 77.1% | 75.9% | Gemini 4 Hydrogen |
| LiveBench long agentic | 61.8% | 38.7% | Gemini 4 Hydrogen |
| SREBench (Vals AI) | Not measured | 27.1% | Only Kimi K3.1 Pro measured |
| Tax Agent Bench (Vals AI) | 52.3% | 24.9% | Gemini 4 Hydrogen |
| Legal Research Bench (Vals AI) | 53.8% | 37.5% | Gemini 4 Hydrogen |
| Harvey's Legal Agent Benchmark (Vals AI) | 11.3% | 11.7% | Kimi K3.1 Pro |
| BioMysteryBench (Vals AI) | Not measured | 75.6% | Only Kimi K3.1 Pro measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 31.4% | Only Kimi K3.1 Pro measured |
| Vals Science Index | Not measured | 44.4% | Only Kimi K3.1 Pro measured |
| APEX-Agents | Not measured | 65.5% | Only Kimi K3.1 Pro measured |
| Neither model has a result on the other 27 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index51
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.6% | 91.1% | Kimi K3.1 Pro |
| MysteryMechanism (Vals AI) | Not measured | 26.1% | Only Kimi K3.1 Pro measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 52.5% | Only Kimi K3.1 Pro measured |
| HLE-Diamond (Artificial Analysis run) | 58.8% | 37.3% | Gemini 4 Hydrogen |
| CritPt v2, hard subset (Artificial Analysis run) | 66.0% | 49.5% | Gemini 4 Hydrogen |
| LMArena Text: hard prompts | 1520 | 1471 | Gemini 4 Hydrogen |
| LMArena Text: expert | 1558 | 1489 | Gemini 4 Hydrogen |
| LMArena Text: hard prompts in English | 1514 | 1486 | Gemini 4 Hydrogen |
| Neither model has a result on the other 18 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| ProofBench | Not measured | 91.0% | Only Kimi K3.1 Pro measured |
| LMArena Text: math | 1507 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: mathematical work | 1534 | 1451 | Gemini 4 Hydrogen |
| MathArena | Not measured | 54.3% | Only Kimi K3.1 Pro measured |
| Neither model has a result on the other 10 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| AA-Omniscience | 46.3 | 29.9 | Gemini 4 Hydrogen |
| LMArena Text: science | 1519 | 1464 | Gemini 4 Hydrogen |
| LMArena Text: medicine and healthcare | 1488 | 1413 | Gemini 4 Hydrogen |
| LMArena Text: legal and government | 1532 | 1495 | Gemini 4 Hydrogen |
| LMArena Text: business and finance | 1486 | 1472 | Gemini 4 Hydrogen |
| PRBench Finance | Not measured | 47.5% | Only Kimi K3.1 Pro measured |
| PRBench Legal | Not measured | 47.9% | Only Kimi K3.1 Pro measured |
| Neither model has a result on the other 14 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index14
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| Design Arena: websites | 1320 | 1321 | Kimi K3.1 Pro |
| Design Arena: UI components | Not measured | 1389 | Only Kimi K3.1 Pro measured |
| Design Arena: game dev | 1369 | 1404 | Kimi K3.1 Pro |
| Design Arena: data viz | Not measured | 1298 | Only Kimi K3.1 Pro measured |
| Design Arena: 3D | 1415 | 1442 | Kimi K3.1 Pro |
| Design Arena: all code categories | 1333 | 1350 | Kimi K3.1 Pro |
| Design Arena: SVG | Not measured | 1329 | Only Kimi K3.1 Pro measured |
| Design Arena: ASCII art | Not measured | 1301 | Only Kimi K3.1 Pro measured |
| LiveBench design | 77.3% | 73.7% | Gemini 4 Hydrogen |
GeneralLike-for-likePublic boards, shown as published, kept out of the index131
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | Leader |
|---|---|---|---|
| Vals Index | 68.5% | 62.5% | Gemini 4 Hydrogen |
| LiveBench data analysis | 83.2% | 79.1% | Gemini 4 Hydrogen |
| Long context reasoning (AA-LCR) | Not measured | 86.3% | Only Kimi K3.1 Pro measured |
| GDPval-AA | Not measured | 1861 | Only Kimi K3.1 Pro measured |
| DTBench | Not measured | 93.3% | Only Kimi K3.1 Pro measured |
| LMCA | Not measured | 57.6% | Only Kimi K3.1 Pro measured |
| LMArena Text | 1502 | 1459 | Gemini 4 Hydrogen |
| LMArena Text: instruction following | 1519 | 1472 | Gemini 4 Hydrogen |
| LMArena Text: creative writing | 1509 | 1439 | Gemini 4 Hydrogen |
| LMArena Text: English | 1499 | 1466 | Gemini 4 Hydrogen |
| LMArena Text: non-English | 1495 | 1450 | Gemini 4 Hydrogen |
| LMArena Text: Chinese | 1631 | 1516 | Gemini 4 Hydrogen |
| LMArena Text: French | 1512 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: Spanish | 1494 | 1503 | Kimi K3.1 Pro |
| LMArena Text: Russian | 1492 | 1452 | Gemini 4 Hydrogen |
| LMArena Text: multi-turn | 1485 | 1449 | Gemini 4 Hydrogen |
| LMArena Text: longer queries | 1524 | 1468 | Gemini 4 Hydrogen |
| LMArena Text: writing and language | 1500 | 1458 | Gemini 4 Hydrogen |
| LMArena Text: entertainment and media | 1503 | 1460 | Gemini 4 Hydrogen |
| Neither model has a result on the other 30 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Kimi K3.1 Pro | 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
Gemini 4 Hydrogen costs less
Repository review
50K input + 3K output tokens
Gemini 4 Hydrogen costs less
Agent loop
200K input + 10K output tokens
Gemini 4 Hydrogen 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 | MoonshotAI Kimi K3.1 Pro |
|---|---|---|
| Maker | Moonshot AI | |
| Weights | No public weights listed | Open weights |
| Released | November 12, 2026 | October 23, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.50 | $2.00 |
| Output $/Mtok | $7.50 | $10.00 |
| Coding index | 77.9 | 79.0 |
| Independent measurements behind it | 4 | 4 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Hydrogen better than Kimi K3.1 Pro for coding?
Gemini 4 Hydrogen and Kimi K3.1 Pro are level for coding, 77.9 against 79.0 on the Vibe Coding Index, so price and context decide. Pick Gemini 4 Hydrogen for output tokens 1.3x cheaper ($7.50 vs $10.00 per million) and work measured by LiveBench coding or LMArena WebDev, where it leads. Pick Kimi K3.1 Pro for work measured by Terminal-Bench 4 (Vals AI) or Terminal-Bench 4.0 (Artificial Analysis run), where it leads.
Which is cheaper, Gemini 4 Hydrogen or Kimi K3.1 Pro?
Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; Kimi K3.1 Pro costs $2.00 and $10.00. Cost per solved task is known for neither of them.
Which has the bigger context window, Gemini 4 Hydrogen or Kimi K3.1 Pro?
Neither: both take 1.05M tokens.
How many benchmarks is the Gemini 4 Hydrogen vs Kimi K3.1 Pro comparison based on?
47 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 independent benchmarks and Kimi K3.1 Pro's on 4. Where only one model has a result, the page says so instead of naming a winner.