Gemini 4 Hydrogen vs MiMo-V2.5
Gemini 4 Hydrogen leads MiMo-V2.5 on coding, 77.9 to 50.0 on the Vibe Coding Index, and MiMo-V2.5 costs 3.8x less per output token ($2.00 vs $7.50 per million). Updated November 14, 2026; 35 benchmarks have a result for both.
Gemini 4 Hydrogen or MiMo-V2.5: which to pick
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 50.0 for MiMo-V2.5.
Pick MiMo-V2.5 for output tokens 3.8x cheaper ($2.00 vs $7.50 per million).
- Shared results
- 35
- Gemini 4 Hydrogen only
- 15
- MiMo-V2.5 only
- 47
- 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 50.0.
4 and 3 benchmarks behind the scores
Agentic work
AA Agentic Index
No call
Only MiMo-V2.5 has a AA Agentic Index result, 15.8.
Directional only
Reasoning
GPQA Diamond
No call
Only MiMo-V2.5 has a GPQA Diamond result, 81.6%.
Directional only
Knowledge
MMLU Pro
No call
Only MiMo-V2.5 has a MMLU Pro result, 82.9%.
Directional only
Web design
Design Arena: websites
Gemini 4 Hydrogen
Gemini 4 Hydrogen leads, 1320 against 1260.
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
Gemini 4 Hydrogen
Gemini 4 Hydrogen takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
MiMo-V2.5
Gemini 4 Hydrogen $0.0053, MiMo-V2.5 $0.0014 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only MiMo-V2.5 has the number, $0.01.
Directional only
At a glance
- Coding index
- Gemini 4 Hydrogen 77.9 from 4 benchmarks, MiMo-V2.5 50.0 from 3 benchmarks.
- Widest category
- Agentic work, 44.6 points apart on average over 2 shared benchmarks.
- Widest single gap
- Terminal-Bench 4.0 (Artificial Analysis run): Gemini 4 Hydrogen 54.0% against MiMo-V2.5 0.0%, 54.0 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Hydrogen $7.50 against MiMo-V2.5 $2.00 per million output tokens, 3.8x apart.
- Context window
- Gemini 4 Hydrogen takes 1.05M tokens, MiMo-V2.5 1M.
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 | MiMo-V2.5 | Ties |
|---|---|---|---|---|
| Coding | 7 | 0 | ||
| Agentic work | 2 | 0 | ||
| Reasoning | 3 | 0 | ||
| Math | 2 | 0 | ||
| Knowledge | 4 | 0 | ||
| Web design | 4 | 0 | ||
| General | 13 | 0 | ||
| All shared boards | 35 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| LiveBench coding | 78.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev | 1704 | 1438 | Gemini 4 Hydrogen |
| AA Coding Index | Not measured | 56.8 | Only MiMo-V2.5 measured |
| LiveCodeBench (Vals AI) | Not measured | 81.5% | Only MiMo-V2.5 measured |
| SWE-bench Verified (Vals AI) | Not measured | 71.0% | Only MiMo-V2.5 measured |
| Terminal-Bench 4 (Vals AI) | 54.0% | Not measured | Only Gemini 4 Hydrogen measured |
| Vibe Code Bench (Vals AI) | 87.8% | 42.2% | Gemini 4 Hydrogen |
| Code migration (Vals AI) | Not measured | 14.2% | Only MiMo-V2.5 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 60.7% | Only MiMo-V2.5 measured |
| SciCode | Not measured | 43.9% | Only MiMo-V2.5 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 41.7% | Only MiMo-V2.5 measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 54.0% | 0.0% | Gemini 4 Hydrogen |
| FrontierCode 2.0 | 39.0% | Not measured | Only Gemini 4 Hydrogen measured |
| ALE-Bench | Not measured | 514.0 | Only MiMo-V2.5 measured |
| LMArena Text: coding | 1516 | 1469 | Gemini 4 Hydrogen |
| LMArena Text: software and IT | 1513 | 1463 | Gemini 4 Hydrogen |
| LMArena WebDev: React | 1724 | 1423 | Gemini 4 Hydrogen |
| LMArena WebDev: HTML | 1743 | 1429 | Gemini 4 Hydrogen |
| GameBench 2 | Not measured | 24.1 | Only MiMo-V2.5 measured |
| CursorBench 4.0 | 57.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 32 boards here | |||
IntelligenceNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| Neither model has a result on 2 boards here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 15.8 | Only MiMo-V2.5 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 | 36.7% | Only MiMo-V2.5 measured |
| Tax Agent Bench (Vals AI) | 52.3% | 7.8% | Gemini 4 Hydrogen |
| Legal Research Bench (Vals AI) | 53.8% | 9.1% | 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 | 55.1% | Only MiMo-V2.5 measured |
| τ²-Bench Telecom | Not measured | 90.6% | Only MiMo-V2.5 measured |
| Toolathlon-Verified | Not measured | 49.1% | Only MiMo-V2.5 measured |
| Neither model has a result on the other 33 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 81.6% | Only MiMo-V2.5 measured |
| LiveBench reasoning | 88.6% | Not measured | Only Gemini 4 Hydrogen measured |
| MMMU Pro (Vals AI) | Not measured | 80.0% | Only MiMo-V2.5 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 84.9% | Only MiMo-V2.5 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 27.2% | Only MiMo-V2.5 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 |
| LMArena Text: hard prompts | 1520 | 1450 | Gemini 4 Hydrogen |
| LMArena Text: expert | 1558 | 1460 | Gemini 4 Hydrogen |
| LMArena Text: hard prompts in English | 1514 | 1461 | Gemini 4 Hydrogen |
| LMArena Vision: diagrams | Not measured | 1270 | Only MiMo-V2.5 measured |
| LMArena Vision: homework | Not measured | 1261 | Only MiMo-V2.5 measured |
| Neither model has a result on the other 14 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| ProofBench | Not measured | 16.0% | Only MiMo-V2.5 measured |
| LMArena Text: math | 1507 | 1436 | Gemini 4 Hydrogen |
| LMArena Text: mathematical work | 1534 | 1449 | Gemini 4 Hydrogen |
| Neither model has a result on the other 11 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 82.9% | Only MiMo-V2.5 measured |
| LegalBench (Vals AI) | Not measured | 78.9% | Only MiMo-V2.5 measured |
| CorpFin (Vals AI) | Not measured | 59.9% | Only MiMo-V2.5 measured |
| TaxEval (Vals AI) | Not measured | 71.8% | Only MiMo-V2.5 measured |
| MortgageTax (Vals AI) | Not measured | 59.3% | Only MiMo-V2.5 measured |
| MedCode (Vals AI) | Not measured | 31.9% | Only MiMo-V2.5 measured |
| AA-Omniscience | 46.3 | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena Text: science | 1519 | 1439 | Gemini 4 Hydrogen |
| LMArena Text: medicine and healthcare | 1488 | 1431 | Gemini 4 Hydrogen |
| LMArena Text: legal and government | 1532 | 1423 | Gemini 4 Hydrogen |
| LMArena Text: business and finance | 1486 | 1432 | Gemini 4 Hydrogen |
| Neither model has a result on the other 10 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | Leader |
|---|---|---|---|
| Design Arena: websites | 1320 | 1260 | Gemini 4 Hydrogen |
| Design Arena: UI components | Not measured | 1249 | Only MiMo-V2.5 measured |
| Design Arena: game dev | 1369 | 1242 | Gemini 4 Hydrogen |
| Design Arena: data viz | Not measured | 1249 | Only MiMo-V2.5 measured |
| Design Arena: 3D | 1415 | 1197 | Gemini 4 Hydrogen |
| Design Arena: all code categories | 1333 | 1252 | Gemini 4 Hydrogen |
| Design Arena: SVG | Not measured | 1175 | Only MiMo-V2.5 measured |
| Design Arena: ASCII art | Not measured | 1139 | Only MiMo-V2.5 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 | MiMo-V2.5 | Leader |
|---|---|---|---|
| Vals Index | 68.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench data analysis | 83.2% | Not measured | Only Gemini 4 Hydrogen measured |
| MedScribe (Vals AI) | Not measured | 72.2% | Only MiMo-V2.5 measured |
| Vals Multimodal Index | Not measured | 52.8% | Only MiMo-V2.5 measured |
| IFBench | Not measured | 67.1% | Only MiMo-V2.5 measured |
| Long context reasoning (AA-LCR) | Not measured | 73.0% | Only MiMo-V2.5 measured |
| GDPval-AA | Not measured | 1004 | Only MiMo-V2.5 measured |
| LMArena Text | 1502 | 1427 | Gemini 4 Hydrogen |
| LMArena Text: instruction following | 1519 | 1434 | Gemini 4 Hydrogen |
| LMArena Text: creative writing | 1509 | 1391 | Gemini 4 Hydrogen |
| LMArena Vision | Not measured | 1248 | Only MiMo-V2.5 measured |
| LMArena Text: English | 1499 | 1447 | Gemini 4 Hydrogen |
| LMArena Text: non-English | 1495 | 1404 | Gemini 4 Hydrogen |
| LMArena Text: Chinese | 1631 | 1470 | Gemini 4 Hydrogen |
| LMArena Text: German | Not measured | 1419 | Only MiMo-V2.5 measured |
| LMArena Text: Japanese | Not measured | 1305 | Only MiMo-V2.5 measured |
| LMArena Text: Korean | Not measured | 1356 | Only MiMo-V2.5 measured |
| LMArena Text: French | 1512 | 1450 | Gemini 4 Hydrogen |
| LMArena Text: Spanish | 1494 | 1416 | Gemini 4 Hydrogen |
| LMArena Text: Russian | 1492 | 1395 | Gemini 4 Hydrogen |
| LMArena Text: Polish | Not measured | 1410 | Only MiMo-V2.5 measured |
| LMArena Text: multi-turn | 1485 | 1445 | Gemini 4 Hydrogen |
| LMArena Text: longer queries | 1524 | 1445 | Gemini 4 Hydrogen |
| LMArena Text: writing and language | 1500 | 1408 | Gemini 4 Hydrogen |
| LMArena Text: entertainment and media | 1503 | 1399 | Gemini 4 Hydrogen |
| LMArena Vision: English | Not measured | 1259 | Only MiMo-V2.5 measured |
| LMArena Vision: Chinese | Not measured | 1324 | Only MiMo-V2.5 measured |
| LMArena Vision: reading text | Not measured | 1257 | Only MiMo-V2.5 measured |
| LMArena Vision: humor | Not measured | 1226 | Only MiMo-V2.5 measured |
| LMArena Vision: recognizing things | Not measured | 1195 | Only MiMo-V2.5 measured |
| LMArena Vision: creative writing | Not measured | 1230 | Only MiMo-V2.5 measured |
| Neither model has a result on the other 18 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | MiMo-V2.5 | 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
MiMo-V2.5 costs less
Repository review
50K input + 3K output tokens
MiMo-V2.5 costs less
Agent loop
200K input + 10K output tokens
MiMo-V2.5 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 | Xiaomi MiMo-V2.5 |
|---|---|---|
| Maker | Xiaomi | |
| Weights | No public weights listed | Open weights |
| Released | November 12, 2026 | April 22, 2026 |
| Context window | 1.05M | 1M |
| Input $/Mtok | $1.50 | $0.40 |
| Output $/Mtok | $7.50 | $2.00 |
| Coding index | 77.9 | 50.0 |
| Independent measurements behind it | 4 | 3 |
| Cost per solved task | Not computable | $0.01 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Hydrogen better than MiMo-V2.5 for coding?
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 50.0 for MiMo-V2.5. Pick MiMo-V2.5 for output tokens 3.8x cheaper ($2.00 vs $7.50 per million).
Which is cheaper, Gemini 4 Hydrogen or MiMo-V2.5?
Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; MiMo-V2.5 costs $0.40 and $2.00. Cost per solved task is known for MiMo-V2.5 only.
Which has the bigger context window, Gemini 4 Hydrogen or MiMo-V2.5?
Gemini 4 Hydrogen, with 1.05M tokens against 1M.
How many benchmarks is the Gemini 4 Hydrogen vs MiMo-V2.5 comparison based on?
35 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 independent benchmarks and MiMo-V2.5's on 3. Where only one model has a result, the page says so instead of naming a winner.