Gemini 4 Hydrogen vs GPT-5.4 Mini
Gemini 4 Hydrogen leads GPT-5.4 Mini on coding, 77.9 to 35.8 on the Vibe Coding Index, and GPT-5.4 Mini costs 1.7x less per output token ($4.50 vs $7.50 per million). Updated November 14, 2026; 32 benchmarks have a result for both.
Gemini 4 Hydrogen or GPT-5.4 Mini: which to pick
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini, though on 4 benchmarks against 5.
Pick GPT-5.4 Mini for output tokens 1.7x cheaper ($4.50 vs $7.50 per million).
- Shared results
- 32
- Gemini 4 Hydrogen only
- 18
- GPT-5.4 Mini only
- 61
- 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 35.8.
4 and 5 benchmarks behind the scores
Agentic work
AA Agentic Index
No call
Only GPT-5.4 Mini has a AA Agentic Index result, 17.9.
Directional only
Reasoning
GPQA Diamond
No call
Only GPT-5.4 Mini has a GPQA Diamond result, 83.1%.
Directional only
Math
AIME
No call
Only GPT-5.4 Mini has a AIME result, 95.6%.
Directional only
Knowledge
MMLU Pro
No call
Only GPT-5.4 Mini has a MMLU Pro result, 84.5%.
Directional only
Web design
Design Arena: websites
No call
Only Gemini 4 Hydrogen has a Design Arena: websites result, 1320.
Directional only
General
Vals Index
No call
Only Gemini 4 Hydrogen has a Vals Index result, 68.5%.
Directional only
Long documents
Listed context window
Gemini 4 Hydrogen
Gemini 4 Hydrogen takes 1.05M tokens against 400K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-5.4 Mini
Gemini 4 Hydrogen $0.0053, GPT-5.4 Mini $0.0030 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.4 Mini has the number, $0.70.
Directional only
At a glance
- Coding index
- Gemini 4 Hydrogen 77.9 from 4 benchmarks, GPT-5.4 Mini 35.8 from 5 benchmarks.
- Widest category
- Agentic work, 42.4 points apart on average over 2 shared benchmarks.
- Widest single gap
- Terminal-Bench 4 (Vals AI): Gemini 4 Hydrogen 54.0% against GPT-5.4 Mini 2.5%, 68.7 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Hydrogen $7.50 against GPT-5.4 Mini $4.50 per million output tokens, 1.7x apart.
- Context window
- Gemini 4 Hydrogen takes 1.05M tokens, GPT-5.4 Mini 400K.
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-5.4 Mini | Ties |
|---|---|---|---|---|
| Coding | 8 | 0 | ||
| Agentic work | 2 | 0 | ||
| Reasoning | 3 | 0 | ||
| Math | 2 | 0 | ||
| Knowledge | 4 | 0 | ||
| General | 13 | 0 | ||
| All shared boards | 32 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | Leader |
|---|---|---|---|
| LiveBench coding | 78.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev | 1704 | 1398 | Gemini 4 Hydrogen |
| AA Coding Index | Not measured | 56.1 | Only GPT-5.4 Mini measured |
| LiveCodeBench (Vals AI) | Not measured | 81.5% | Only GPT-5.4 Mini measured |
| SWE-bench Verified (Vals AI) | Not measured | 73.0% | Only GPT-5.4 Mini measured |
| Terminal-Bench 4 (Vals AI) | 54.0% | 2.5% | Gemini 4 Hydrogen |
| Vibe Code Bench (Vals AI) | 87.8% | 48.0% | Gemini 4 Hydrogen |
| Code migration (Vals AI) | Not measured | 12.9% | Only GPT-5.4 Mini measured |
| ProgramBench (Vals AI) | Not measured | 0.0% | Only GPT-5.4 Mini measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 54.7% | Only GPT-5.4 Mini measured |
| SciCode | Not measured | 52.1% | Only GPT-5.4 Mini measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 52.3% | Only GPT-5.4 Mini measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 54.0% | 2.0% | Gemini 4 Hydrogen |
| FrontierCode 2.0 | 39.0% | Not measured | Only Gemini 4 Hydrogen measured |
| FrontierCode | Not measured | 27.0% | Only GPT-5.4 Mini measured |
| WeirdML | Not measured | 60.3% | Only GPT-5.4 Mini measured |
| ALE-Bench | Not measured | 1188.6 | Only GPT-5.4 Mini measured |
| LMArena Text: coding | 1516 | 1439 | Gemini 4 Hydrogen |
| LMArena Text: software and IT | 1513 | 1437 | Gemini 4 Hydrogen |
| LMArena WebDev: React | 1724 | 1386 | Gemini 4 Hydrogen |
| LMArena WebDev: HTML | 1743 | 1420 | Gemini 4 Hydrogen |
| GameBench 2 | Not measured | 46.3 | Only GPT-5.4 Mini measured |
| Terminal-Bench 4.0 | Not measured | 1.8% | Only GPT-5.4 Mini measured |
| CursorBench 4.0 | 57.8% | Not measured | Only Gemini 4 Hydrogen measured |
| ProgramBench | Not measured | 0.0% | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 27 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | Leader |
|---|---|---|---|
| Epoch Capabilities Index | Not measured | 149.3 | Only GPT-5.4 Mini 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-5.4 Mini | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 17.9 | Only GPT-5.4 Mini 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 |
| Finance Agent (Vals AI) | Not measured | 45.4% | Only GPT-5.4 Mini measured |
| Tax Agent Bench (Vals AI) | 52.3% | 8.8% | Gemini 4 Hydrogen |
| Legal Research Bench (Vals AI) | 53.8% | 12.5% | 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 | 45.4% | Only GPT-5.4 Mini measured |
| τ²-Bench Telecom | Not measured | 83.3% | Only GPT-5.4 Mini measured |
| DeepResearch Bench | Not measured | 36.3% | Only GPT-5.4 Mini measured |
| MCP Atlas | Not measured | 56.7% | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 32 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 83.1% | Only GPT-5.4 Mini measured |
| LiveBench reasoning | 88.6% | Not measured | Only Gemini 4 Hydrogen measured |
| MMMU Pro (Vals AI) | Not measured | 79.3% | Only GPT-5.4 Mini measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 87.5% | Only GPT-5.4 Mini measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 28.1% | Only GPT-5.4 Mini measured |
| HLE-Diamond (Artificial Analysis run) | 58.8% | Not measured | Only Gemini 4 Hydrogen measured |
| CritPt v2, hard subset (Artificial Analysis run) | 66.0% | Not measured | Only Gemini 4 Hydrogen measured |
| GPQA Diamond (Epoch AI run) | Not measured | 86.9% | Only GPT-5.4 Mini measured |
| ARC-AGI | Not measured | 63.7% | Only GPT-5.4 Mini measured |
| ARC-AGI-2 | Not measured | 18.9% | Only GPT-5.4 Mini measured |
| Chess puzzles | Not measured | 23.0% | Only GPT-5.4 Mini measured |
| Mystery game puzzles | Not measured | 11.0% | Only GPT-5.4 Mini measured |
| LMArena Text: hard prompts | 1520 | 1425 | Gemini 4 Hydrogen |
| LMArena Text: expert | 1558 | 1436 | Gemini 4 Hydrogen |
| LMArena Text: hard prompts in English | 1514 | 1420 | Gemini 4 Hydrogen |
| LMArena Vision: diagrams | Not measured | 1265 | Only GPT-5.4 Mini measured |
| LMArena Vision: homework | Not measured | 1285 | Only GPT-5.4 Mini measured |
| Kagi LLM Benchmark | Not measured | 37.9% | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 8 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | Leader |
|---|---|---|---|
| AIME | Not measured | 95.6% | Only GPT-5.4 Mini measured |
| OTIS Mock AIME | Not measured | 88.9% | Only GPT-5.4 Mini measured |
| FrontierMath, tiers 1 to 3 | Not measured | 51.2% | Only GPT-5.4 Mini measured |
| FrontierMath, tier 4 | Not measured | 9.8% | Only GPT-5.4 Mini measured |
| ProofBench | Not measured | 21.0% | Only GPT-5.4 Mini measured |
| LMArena Text: math | 1507 | 1418 | Gemini 4 Hydrogen |
| LMArena Text: mathematical work | 1534 | 1428 | Gemini 4 Hydrogen |
| 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-5.4 Mini | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 84.5% | Only GPT-5.4 Mini measured |
| CaseLaw (Vals AI) | Not measured | 51.7% | Only GPT-5.4 Mini measured |
| CorpFin (Vals AI) | Not measured | 60.9% | Only GPT-5.4 Mini measured |
| TaxEval (Vals AI) | Not measured | 71.2% | Only GPT-5.4 Mini measured |
| MortgageTax (Vals AI) | Not measured | 63.5% | Only GPT-5.4 Mini measured |
| AA-Omniscience | 46.3 | Not measured | Only Gemini 4 Hydrogen measured |
| SimpleQA Verified | Not measured | 29.4% | Only GPT-5.4 Mini measured |
| LMArena Text: science | 1519 | 1417 | Gemini 4 Hydrogen |
| LMArena Text: medicine and healthcare | 1488 | 1395 | Gemini 4 Hydrogen |
| LMArena Text: legal and government | 1532 | 1415 | Gemini 4 Hydrogen |
| LMArena Text: business and finance | 1486 | 1418 | Gemini 4 Hydrogen |
| Neither model has a result on the other 10 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | Leader |
|---|---|---|---|
| Design Arena: websites | 1320 | Not measured | Only Gemini 4 Hydrogen measured |
| Design Arena: game dev | 1369 | Not measured | Only Gemini 4 Hydrogen measured |
| Design Arena: 3D | 1415 | Not measured | Only Gemini 4 Hydrogen measured |
| Design Arena: all code categories | 1333 | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench design | 77.3% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 4 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index130
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | Leader |
|---|---|---|---|
| Vals Index | 68.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench data analysis | 83.2% | Not measured | Only Gemini 4 Hydrogen measured |
| Vals Multimodal Index | Not measured | 54.2% | Only GPT-5.4 Mini measured |
| IFBench | Not measured | 73.3% | Only GPT-5.4 Mini measured |
| Long context reasoning (AA-LCR) | Not measured | 77.0% | Only GPT-5.4 Mini measured |
| GDPval-AA | Not measured | 1021 | Only GPT-5.4 Mini measured |
| DTBench | Not measured | 80.0% | Only GPT-5.4 Mini measured |
| LMCA | Not measured | 40.8% | Only GPT-5.4 Mini measured |
| LMArena Text | 1502 | 1412 | Gemini 4 Hydrogen |
| LMArena Text: instruction following | 1519 | 1405 | Gemini 4 Hydrogen |
| LMArena Text: creative writing | 1509 | 1369 | Gemini 4 Hydrogen |
| LMArena Vision | Not measured | 1244 | Only GPT-5.4 Mini measured |
| LMArena Text: English | 1499 | 1412 | Gemini 4 Hydrogen |
| LMArena Text: non-English | 1495 | 1405 | Gemini 4 Hydrogen |
| LMArena Text: Chinese | 1631 | 1445 | Gemini 4 Hydrogen |
| LMArena Text: German | Not measured | 1409 | Only GPT-5.4 Mini measured |
| LMArena Text: Japanese | Not measured | 1372 | Only GPT-5.4 Mini measured |
| LMArena Text: Korean | Not measured | 1367 | Only GPT-5.4 Mini measured |
| LMArena Text: French | 1512 | 1443 | Gemini 4 Hydrogen |
| LMArena Text: Spanish | 1494 | 1405 | Gemini 4 Hydrogen |
| LMArena Text: Russian | 1492 | 1417 | Gemini 4 Hydrogen |
| LMArena Text: Polish | Not measured | 1417 | Only GPT-5.4 Mini measured |
| LMArena Text: multi-turn | 1485 | 1429 | Gemini 4 Hydrogen |
| LMArena Text: longer queries | 1524 | 1408 | Gemini 4 Hydrogen |
| LMArena Text: writing and language | 1500 | 1393 | Gemini 4 Hydrogen |
| LMArena Text: entertainment and media | 1503 | 1372 | Gemini 4 Hydrogen |
| LMArena Vision: English | Not measured | 1244 | Only GPT-5.4 Mini measured |
| LMArena Vision: Chinese | Not measured | 1286 | Only GPT-5.4 Mini measured |
| LMArena Vision: reading text | Not measured | 1253 | Only GPT-5.4 Mini measured |
| LMArena Vision: humor | Not measured | 1238 | Only GPT-5.4 Mini measured |
| LMArena Vision: recognizing things | Not measured | 1223 | Only GPT-5.4 Mini measured |
| LMArena Vision: creative writing | Not measured | 1221 | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 17 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | GPT-5.4 Mini | 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
GPT-5.4 Mini costs less
Repository review
50K input + 3K output tokens
GPT-5.4 Mini costs less
Agent loop
200K input + 10K output tokens
GPT-5.4 Mini 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-5.4 Mini |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | November 12, 2026 | March 17, 2026 |
| Context window | 1.05M | 400K |
| Input $/Mtok | $1.50 | $0.75 |
| Output $/Mtok | $7.50 | $4.50 |
| Coding index | 77.9 | 35.8 |
| Independent measurements behind it | 4 | 5 |
| Cost per solved task | Not computable | $0.70 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Hydrogen better than GPT-5.4 Mini for coding?
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini, though on 4 benchmarks against 5. Pick GPT-5.4 Mini for output tokens 1.7x cheaper ($4.50 vs $7.50 per million).
Which is cheaper, Gemini 4 Hydrogen or GPT-5.4 Mini?
Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; GPT-5.4 Mini costs $0.75 and $4.50. Cost per solved task is known for GPT-5.4 Mini only.
Which has the bigger context window, Gemini 4 Hydrogen or GPT-5.4 Mini?
Gemini 4 Hydrogen, with 1.05M tokens against 400K.
How many benchmarks is the Gemini 4 Hydrogen vs GPT-5.4 Mini comparison based on?
32 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-5.4 Mini's on 5. Where only one model has a result, the page says so instead of naming a winner.