Gemini 4 Hydrogen vs GPT-5.6 Sol
Gemini 4 Hydrogen leads GPT-5.6 Sol on coding, 77.9 to 70.6 on the Vibe Coding Index, and Gemini 4 Hydrogen costs 2.7x less per output token ($7.50 vs $20.00 per million). Updated November 14, 2026; 38 benchmarks have a result for both.
vs boards won of 38 shared
Gemini 4 Hydrogen or GPT-5.6 Sol: which to pick
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 70.6 for GPT-5.6 Sol, though on 4 benchmarks against 5.
Pick GPT-5.6 Sol for a larger context window (1.05M against 1.05M tokens) and work measured by Design Arena: all code categories, where it leads.
Model AGemini 4 HydrogenGoogle77.9/1004 independent benchmarksNo cost per solved taskModel BGPT-5.6 SolOpenAI70.6/1005 independent benchmarks$1.20 per solved task
- Shared results
- 38
- Gemini 4 Hydrogen only
- 12
- GPT-5.6 Sol only
- 113
- 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
Gemini 4 Hydrogen
Gemini 4 Hydrogen scores 77.9 against 70.6.
4 and 5 benchmarks behind the scores
Agentic work
AA Agentic Index
No call
Only GPT-5.6 Sol has a AA Agentic Index result, 47.4.
Directional only
Reasoning
GPQA Diamond
No call
Only GPT-5.6 Sol has a GPQA Diamond result, 95.2%.
Directional only
Knowledge
MMLU Pro
No call
Only GPT-5.6 Sol has a MMLU Pro result, 89.1%.
Directional only
Web design
Design Arena: websites
Gemini 4 Hydrogen
Gemini 4 Hydrogen leads, 1320 against 1319.
Same board, both measured
General
Vals Index
No call
Only Gemini 4 Hydrogen has a Vals Index result, 68.5%.
Directional only
Long documents
Listed context window
GPT-5.6 Sol
GPT-5.6 Sol takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 4 Hydrogen
Gemini 4 Hydrogen $0.0053, GPT-5.6 Sol $0.014 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.6 Sol has the number, $1.20.
Directional only
At a glance
- Coding index
- Gemini 4 Hydrogen 77.9 from 4 benchmarks, GPT-5.6 Sol 70.6 from 5 benchmarks.
- Widest category
- Agentic work, 13.5 points apart on average over 2 shared benchmarks.
- Widest single gap
- Terminal-Bench 4 (Vals AI): Gemini 4 Hydrogen 54.0% against GPT-5.6 Sol 37.9%, 21.5 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Hydrogen $7.50 against GPT-5.6 Sol $20.00 per million output tokens, 2.7x apart.
- Context window
- Gemini 4 Hydrogen takes 1.05M tokens, GPT-5.6 Sol 1.05M.
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 | GPT-5.6 Sol | Ties |
|---|---|---|---|---|
| Coding | 9 | 0 | ||
| Agentic work | 2 | 0 | ||
| Reasoning | 4 | 0 | ||
| Math | 2 | 0 | ||
| Knowledge | 4 | 0 | ||
| Web design | 3 | 1 | ||
| General | 13 | 0 | ||
| All shared boards | 37 | 1 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index90
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| LiveBench coding | 78.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev | 1704 | 1615 | Gemini 4 Hydrogen |
| AA Coding Index | Not measured | 78.3 | Only GPT-5.6 Sol measured |
| LiveCodeBench (Vals AI) | Not measured | 82.6% | Only GPT-5.6 Sol measured |
| SWE-bench Verified (Vals AI) | Not measured | 96.2% | Only GPT-5.6 Sol measured |
| Terminal-Bench 4 (Vals AI) | 54.0% | 37.9% | Gemini 4 Hydrogen |
| Vibe Code Bench (Vals AI) | 87.8% | 80.5% | Gemini 4 Hydrogen |
| Code migration (Vals AI) | Not measured | 52.9% | Only GPT-5.6 Sol measured |
| ProgramBench (Vals AI) | Not measured | 1.5% | Only GPT-5.6 Sol measured |
| IOI (Vals AI) | Not measured | 91.2% | Only GPT-5.6 Sol measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 85.8% | Only GPT-5.6 Sol measured |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 20.0% | Only GPT-5.6 Sol measured |
| SkillsBench (Vals AI) | Not measured | 54.1% | Only GPT-5.6 Sol measured |
| CyberBench (Vals AI) | Not measured | 76.3% | Only GPT-5.6 Sol measured |
| SciCode | Not measured | 57.8% | Only GPT-5.6 Sol measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 65.9% | Only GPT-5.6 Sol measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 54.0% | 39.9% | Gemini 4 Hydrogen |
| FrontierCode 2.0 | 39.0% | Not measured | Only Gemini 4 Hydrogen measured |
| FrontierCode | Not measured | 47.5% | Only GPT-5.6 Sol measured |
| FrontierSWE | Not measured | 32.2% | Only GPT-5.6 Sol measured |
| GSO-Bench | Not measured | 76.5% | Only GPT-5.6 Sol measured |
| WeirdML | Not measured | 88.8% | Only GPT-5.6 Sol measured |
| MirrorCode | Not measured | 20.0% | Only GPT-5.6 Sol measured |
| ALE-Bench | Not measured | 2176.9 | Only GPT-5.6 Sol measured |
| LMArena Text: coding | 1516 | 1495 | Gemini 4 Hydrogen |
| LMArena Text: software and IT | 1513 | 1487 | Gemini 4 Hydrogen |
| LMArena WebDev: React | 1724 | 1618 | Gemini 4 Hydrogen |
| LMArena WebDev: HTML | 1743 | 1612 | Gemini 4 Hydrogen |
| LMArena WebDev: from an image | Not measured | 1606 | Only GPT-5.6 Sol measured |
| SciCode | Not measured | 10.8% | Only GPT-5.6 Sol measured |
| SWE-Bench Pro V2 | Not measured | 95.5% | Only GPT-5.6 Sol measured |
| SWE Atlas: Codebase QnA | Not measured | 46.0% | Only GPT-5.6 Sol measured |
| SWE Atlas: Test Writing | Not measured | 45.9% | Only GPT-5.6 Sol measured |
| GameBench 2 | Not measured | 80.1 | Only GPT-5.6 Sol measured |
| Terminal-Bench 3.0 | Not measured | 34.6% | Only GPT-5.6 Sol measured |
| Terminal-Bench 4.0 | Not measured | 37.3% | Only GPT-5.6 Sol measured |
| CursorBench 4.0 | 57.8% | 41.7% | Gemini 4 Hydrogen |
| ProgramBench | Not measured | 1.0% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 14 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| Epoch Capabilities Index | Not measured | 163.0 | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 47.4 | Only GPT-5.6 Sol measured |
| Design Arena: agents building web apps | Not measured | 1218 | Only GPT-5.6 Sol measured |
| Design Arena: agents building full-stack apps | Not measured | 1233 | Only GPT-5.6 Sol measured |
| Design Arena: agents building mobile apps | Not measured | 1223 | Only GPT-5.6 Sol measured |
| Design Arena: agents building Android apps | Not measured | 1219 | Only GPT-5.6 Sol measured |
| Design Arena: agents building Godot games | Not measured | 1237 | Only GPT-5.6 Sol measured |
| Design Arena: agents building games | Not measured | 1208 | Only GPT-5.6 Sol measured |
| Design Arena: HTML slides | Not measured | 1173 | Only GPT-5.6 Sol measured |
| Design Arena: PowerPoint slides | Not measured | 1205 | Only GPT-5.6 Sol measured |
| Design Arena: spreadsheets | Not measured | 1152 | Only GPT-5.6 Sol measured |
| 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 |
| SREBench (Vals AI) | Not measured | 30.5% | Only GPT-5.6 Sol measured |
| Finance Agent (Vals AI) | Not measured | 53.8% | Only GPT-5.6 Sol measured |
| Tax Agent Bench (Vals AI) | 52.3% | 31.1% | Gemini 4 Hydrogen |
| Legal Research Bench (Vals AI) | 53.8% | 48.1% | Gemini 4 Hydrogen |
| Harvey's Legal Agent Benchmark (Vals AI) | 11.3% | Not measured | Only Gemini 4 Hydrogen measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 72.3% | Only GPT-5.6 Sol measured |
| BioMysteryBench (Vals AI) | Not measured | 71.1% | Only GPT-5.6 Sol measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 20.0% | Only GPT-5.6 Sol measured |
| Vals Science Index | Not measured | 41.5% | Only GPT-5.6 Sol measured |
| Time Horizon Index (Vals AI) | Not measured | 23.8% | Only GPT-5.6 Sol measured |
| CUA-bench (Vals AI) | Not measured | 8.3% | Only GPT-5.6 Sol measured |
| τ²-Bench Telecom | Not measured | 85.1% | Only GPT-5.6 Sol measured |
| OSWorld 2.0 | Not measured | 27.3% | Only GPT-5.6 Sol measured |
| BALROG | Not measured | 60.0% | Only GPT-5.6 Sol measured |
| PostTrainBench | Not measured | 31.0% | Only GPT-5.6 Sol measured |
| Vending-Bench 2 | Not measured | $9,619 | Only GPT-5.6 Sol measured |
| LMArena Search | Not measured | 1258 | Only GPT-5.6 Sol measured |
| MCP Atlas | Not measured | 81.8% | Only GPT-5.6 Sol measured |
| τ³-Banking | Not measured | 46.9% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 12 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 95.2% | Only GPT-5.6 Sol measured |
| LiveBench reasoning | 88.6% | Not measured | Only Gemini 4 Hydrogen measured |
| MysteryMechanism (Vals AI) | Not measured | 33.3% | Only GPT-5.6 Sol measured |
| MMMU Pro (Vals AI) | Not measured | 88.8% | Only GPT-5.6 Sol measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 94.1% | Only GPT-5.6 Sol measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 49.5% | Only GPT-5.6 Sol measured |
| HLE-Diamond (Artificial Analysis run) | 58.8% | Not measured | Only Gemini 4 Hydrogen measured |
| CritPt v2, hard subset (Artificial Analysis run) | 66.0% | 60.0% | Gemini 4 Hydrogen |
| GPQA Diamond (Epoch AI run) | Not measured | 93.5% | Only GPT-5.6 Sol measured |
| ARC-AGI | Not measured | 97.5% | Only GPT-5.6 Sol measured |
| ARC-AGI-2 | Not measured | 92.5% | Only GPT-5.6 Sol measured |
| SimpleBench | Not measured | 64.8% | Only GPT-5.6 Sol measured |
| Chess puzzles | Not measured | 59.0% | Only GPT-5.6 Sol measured |
| Mystery game puzzles | Not measured | 58.0% | Only GPT-5.6 Sol measured |
| EBR-bench | Not measured | 44.8% | Only GPT-5.6 Sol measured |
| LMArena Text: hard prompts | 1520 | 1483 | Gemini 4 Hydrogen |
| LMArena Text: expert | 1558 | 1516 | Gemini 4 Hydrogen |
| LMArena Text: hard prompts in English | 1514 | 1479 | Gemini 4 Hydrogen |
| LMArena Vision: diagrams | Not measured | 1306 | Only GPT-5.6 Sol measured |
| LMArena Vision: homework | Not measured | 1306 | Only GPT-5.6 Sol measured |
| Kagi LLM Benchmark | Not measured | 67.0% | Only GPT-5.6 Sol measured |
| Humanity's Last Exam (Scale run) | Not measured | 31.2% | Only GPT-5.6 Sol measured |
| GoBench | Not measured | 1928 | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| OTIS Mock AIME | Not measured | 100.0% | Only GPT-5.6 Sol measured |
| FrontierMath, tiers 1 to 3 | Not measured | 89.1% | Only GPT-5.6 Sol measured |
| FrontierMath, tier 4 | Not measured | 82.9% | Only GPT-5.6 Sol measured |
| ProofBench | Not measured | 83.0% | Only GPT-5.6 Sol measured |
| LMArena Text: math | 1507 | 1472 | Gemini 4 Hydrogen |
| LMArena Text: mathematical work | 1534 | 1493 | Gemini 4 Hydrogen |
| MathArena | Not measured | 56.0% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 89.1% | Only GPT-5.6 Sol measured |
| LegalBench (Vals AI) | Not measured | 87.0% | Only GPT-5.6 Sol measured |
| CorpFin (Vals AI) | Not measured | 64.4% | Only GPT-5.6 Sol measured |
| TaxEval (Vals AI) | Not measured | 74.8% | Only GPT-5.6 Sol measured |
| MortgageTax (Vals AI) | Not measured | 67.3% | Only GPT-5.6 Sol measured |
| MedCode (Vals AI) | Not measured | 44.0% | Only GPT-5.6 Sol measured |
| AA-Omniscience | 46.3 | Not measured | Only Gemini 4 Hydrogen measured |
| SimpleQA Verified | Not measured | 69.7% | Only GPT-5.6 Sol measured |
| GeoBench | Not measured | 73.0% | Only GPT-5.6 Sol measured |
| LMArena Text: science | 1519 | 1457 | Gemini 4 Hydrogen |
| LMArena Text: medicine and healthcare | 1488 | 1430 | Gemini 4 Hydrogen |
| LMArena Text: legal and government | 1532 | 1475 | Gemini 4 Hydrogen |
| LMArena Text: business and finance | 1486 | 1458 | Gemini 4 Hydrogen |
| FACTS Benchmark Suite | Not measured | 70.6% | Only GPT-5.6 Sol measured |
| PRBench Finance | Not measured | 50.4% | Only GPT-5.6 Sol measured |
| PRBench Legal | Not measured | 50.5% | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 5 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index31
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| Design Arena: websites | 1320 | 1319 | Gemini 4 Hydrogen |
| Design Arena: UI components | Not measured | 1327 | Only GPT-5.6 Sol measured |
| Design Arena: game dev | 1369 | 1364 | Gemini 4 Hydrogen |
| Design Arena: data viz | Not measured | 1321 | Only GPT-5.6 Sol measured |
| Design Arena: 3D | 1415 | 1368 | Gemini 4 Hydrogen |
| Design Arena: all code categories | 1333 | 1338 | GPT-5.6 Sol |
| Design Arena: SVG | Not measured | 1304 | Only GPT-5.6 Sol measured |
| Design Arena: ASCII art | Not measured | 1305 | Only GPT-5.6 Sol measured |
| LiveBench design | 77.3% | Not measured | Only Gemini 4 Hydrogen measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index130
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | Leader |
|---|---|---|---|
| Vals Index | 68.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench data analysis | 83.2% | Not measured | Only Gemini 4 Hydrogen measured |
| Public Benefits Bench (Vals AI) | Not measured | 66.5% | Only GPT-5.6 Sol measured |
| MedScribe (Vals AI) | Not measured | 85.2% | Only GPT-5.6 Sol measured |
| Vals Multimodal Index | Not measured | 72.6% | Only GPT-5.6 Sol measured |
| IFBench | Not measured | 72.7% | Only GPT-5.6 Sol measured |
| Long context reasoning (AA-LCR) | Not measured | 84.0% | Only GPT-5.6 Sol measured |
| GDPval-AA | Not measured | 1619 | Only GPT-5.6 Sol measured |
| DTBench | Not measured | 95.7% | Only GPT-5.6 Sol measured |
| LMCA | Not measured | 58.5% | Only GPT-5.6 Sol measured |
| Surface Evolver Bench | Not measured | 93.1% | Only GPT-5.6 Sol measured |
| Furniture assembly | Not measured | 56.7% | Only GPT-5.6 Sol measured |
| LMArena Text | 1502 | 1457 | Gemini 4 Hydrogen |
| LMArena Text: instruction following | 1519 | 1483 | Gemini 4 Hydrogen |
| LMArena Text: creative writing | 1509 | 1451 | Gemini 4 Hydrogen |
| LMArena Vision | Not measured | 1282 | Only GPT-5.6 Sol measured |
| LMArena Text: English | 1499 | 1459 | Gemini 4 Hydrogen |
| LMArena Text: non-English | 1495 | 1450 | Gemini 4 Hydrogen |
| LMArena Text: Chinese | 1631 | 1525 | Gemini 4 Hydrogen |
| LMArena Text: German | Not measured | 1473 | Only GPT-5.6 Sol measured |
| LMArena Text: Japanese | Not measured | 1471 | Only GPT-5.6 Sol measured |
| LMArena Text: Korean | Not measured | 1448 | Only GPT-5.6 Sol measured |
| LMArena Text: French | 1512 | 1474 | Gemini 4 Hydrogen |
| LMArena Text: Spanish | 1494 | 1445 | Gemini 4 Hydrogen |
| LMArena Text: Russian | 1492 | 1472 | Gemini 4 Hydrogen |
| LMArena Text: Polish | Not measured | 1463 | Only GPT-5.6 Sol measured |
| LMArena Text: multi-turn | 1485 | 1462 | Gemini 4 Hydrogen |
| LMArena Text: longer queries | 1524 | 1480 | Gemini 4 Hydrogen |
| LMArena Text: writing and language | 1500 | 1464 | Gemini 4 Hydrogen |
| LMArena Text: entertainment and media | 1503 | 1448 | Gemini 4 Hydrogen |
| LMArena Vision: English | Not measured | 1284 | Only GPT-5.6 Sol measured |
| LMArena Vision: Chinese | Not measured | 1311 | Only GPT-5.6 Sol measured |
| LMArena Vision: reading text | Not measured | 1290 | Only GPT-5.6 Sol measured |
| LMArena Vision: humor | Not measured | 1247 | Only GPT-5.6 Sol measured |
| LMArena Vision: creative writing | Not measured | 1285 | Only GPT-5.6 Sol measured |
| LMArena Document | Not measured | 1480 | Only GPT-5.6 Sol measured |
| EQ-Bench 4 | Not measured | 1236 | Only GPT-5.6 Sol measured |
| Neither model has a result on the other 12 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | GPT-5.6 Sol | 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$0.0053Fits in one request
GPT-5.6 Sol$0.014Fits in one request
Gemini 4 Hydrogen costs less
Repository review
50K input + 3K output tokens
Gemini 4 Hydrogen$0.098Fits in one request
GPT-5.6 Sol$0.260Fits in one request
Gemini 4 Hydrogen costs less
Agent loop
200K input + 10K output tokens
Gemini 4 Hydrogen$0.375Fits in one request
GPT-5.6 Sol$1.00Fits in one request
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 | OpenAI GPT-5.6 Sol |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | November 12, 2026 | July 9, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $1.50 | $4.00 |
| Output $/Mtok | $7.50 | $20.00 |
| Coding index | 77.9 | 70.6 |
| Independent measurements behind it | 4 | 5 |
| Cost per solved task | Not computable | $1.20 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Hydrogen better than GPT-5.6 Sol for coding?
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 70.6 for GPT-5.6 Sol, though on 4 benchmarks against 5. Pick GPT-5.6 Sol for a larger context window (1.05M against 1.05M tokens) and work measured by Design Arena: all code categories, where it leads.
Which is cheaper, Gemini 4 Hydrogen or GPT-5.6 Sol?
Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. Cost per solved task is known for GPT-5.6 Sol only.
Which has the bigger context window, Gemini 4 Hydrogen or GPT-5.6 Sol?
GPT-5.6 Sol, with 1.05M tokens against 1.05M.
How many benchmarks is the Gemini 4 Hydrogen vs GPT-5.6 Sol comparison based on?
38 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 independent benchmarks and GPT-5.6 Sol's on 5. Where only one model has a result, the page says so instead of naming a winner.