Gemini 4 Hydrogen vs Qwen3.5-Flash
Gemini 4 Hydrogen leads Qwen3.5-Flash on coding, 77.9 to 41.1 on the Vibe Coding Index, and Qwen3.5-Flash costs 28.8x less per output token ($0.26 vs $7.50 per million). Updated November 14, 2026; 27 benchmarks have a result for both.
Gemini 4 Hydrogen or Qwen3.5-Flash: which to pick
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash.
Pick Qwen3.5-Flash for output tokens 28.8x cheaper ($0.26 vs $7.50 per million).
- Shared results
- 27
- Gemini 4 Hydrogen only
- 23
- Qwen3.5-Flash only
- 28
- Like-for-like categories
- 5 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 41.1.
4 and 2 benchmarks behind the scores
Reasoning
GPQA Diamond
No call
Only Qwen3.5-Flash has a GPQA Diamond result, 82.8%.
Directional only
Math
AIME
No call
Only Qwen3.5-Flash has a AIME result, 92.5%.
Directional only
Knowledge
MMLU Pro
No call
Only Qwen3.5-Flash has a MMLU Pro result, 84.1%.
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 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5-Flash
Gemini 4 Hydrogen $0.0053, Qwen3.5-Flash $0.0002 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Qwen3.5-Flash has the number, $0.40.
Directional only
At a glance
- Coding index
- Gemini 4 Hydrogen 77.9 from 4 benchmarks, Qwen3.5-Flash 41.1 from 2 benchmarks.
- Widest category
- Coding, 42.6 points apart on average over 5 shared benchmarks.
- Widest single gap
- LMArena WebDev: Gemini 4 Hydrogen 1704 against Qwen3.5-Flash 1243, 65.9 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Hydrogen $7.50 against Qwen3.5-Flash $0.26 per million output tokens, 28.8x apart.
- Context window
- Gemini 4 Hydrogen takes 1.05M tokens, Qwen3.5-Flash 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 | Qwen3.5-Flash | Ties |
|---|---|---|---|---|
| Coding | 5 | 0 | ||
| Reasoning | 3 | 0 | ||
| Math | 2 | 0 | ||
| Knowledge | 4 | 0 | ||
| General | 13 | 0 | ||
| All shared boards | 27 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index50
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | Leader |
|---|---|---|---|
| LiveBench coding | 78.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LMArena WebDev | 1704 | 1243 | Gemini 4 Hydrogen |
| LiveCodeBench (Vals AI) | Not measured | 83.3% | Only Qwen3.5-Flash measured |
| SWE-bench Verified (Vals AI) | Not measured | 64.4% | Only Qwen3.5-Flash measured |
| Terminal-Bench 4 (Vals AI) | 54.0% | Not measured | Only Gemini 4 Hydrogen measured |
| Vibe Code Bench (Vals AI) | 87.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 54.0% | Not measured | Only Gemini 4 Hydrogen measured |
| FrontierCode 2.0 | 39.0% | Not measured | Only Gemini 4 Hydrogen measured |
| ALE-Bench | Not measured | 265.9 | Only Qwen3.5-Flash measured |
| LMArena Text: coding | 1516 | 1412 | Gemini 4 Hydrogen |
| LMArena Text: software and IT | 1513 | 1416 | Gemini 4 Hydrogen |
| LMArena WebDev: React | 1724 | 1228 | Gemini 4 Hydrogen |
| LMArena WebDev: HTML | 1743 | 1291 | Gemini 4 Hydrogen |
| CursorBench 4.0 | 57.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 38 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | Leader |
|---|---|---|---|
| Epoch Capabilities Index | Not measured | 143.8 | Only Qwen3.5-Flash measured |
| Neither model has a result on the other 1 board here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | 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% | Not measured | Only Gemini 4 Hydrogen measured |
| Legal Research Bench (Vals AI) | 53.8% | Not measured | Only Gemini 4 Hydrogen measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 11.3% | Not measured | Only Gemini 4 Hydrogen measured |
| Neither model has a result on the other 38 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 82.8% | Only Qwen3.5-Flash measured |
| LiveBench reasoning | 88.6% | Not measured | Only Gemini 4 Hydrogen measured |
| MMMU Pro (Vals AI) | Not measured | 81.9% | Only Qwen3.5-Flash 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 | 82.3% | Only Qwen3.5-Flash measured |
| Chess puzzles | Not measured | 14.0% | Only Qwen3.5-Flash measured |
| Mystery game puzzles | Not measured | 20.0% | Only Qwen3.5-Flash measured |
| LMArena Text: hard prompts | 1520 | 1404 | Gemini 4 Hydrogen |
| LMArena Text: expert | 1558 | 1408 | Gemini 4 Hydrogen |
| LMArena Text: hard prompts in English | 1514 | 1409 | Gemini 4 Hydrogen |
| Neither model has a result on the other 15 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | Leader |
|---|---|---|---|
| AIME | Not measured | 92.5% | Only Qwen3.5-Flash measured |
| OTIS Mock AIME | Not measured | 84.4% | Only Qwen3.5-Flash measured |
| FrontierMath, tiers 1 to 3 | Not measured | 18.2% | Only Qwen3.5-Flash measured |
| LMArena Text: math | 1507 | 1407 | Gemini 4 Hydrogen |
| LMArena Text: mathematical work | 1534 | 1413 | Gemini 4 Hydrogen |
| Neither model has a result on the other 9 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 84.1% | Only Qwen3.5-Flash measured |
| LegalBench (Vals AI) | Not measured | 84.3% | Only Qwen3.5-Flash measured |
| CaseLaw (Vals AI) | Not measured | 56.0% | Only Qwen3.5-Flash measured |
| CorpFin (Vals AI) | Not measured | 63.6% | Only Qwen3.5-Flash measured |
| TaxEval (Vals AI) | Not measured | 72.2% | Only Qwen3.5-Flash measured |
| MortgageTax (Vals AI) | Not measured | 67.4% | Only Qwen3.5-Flash measured |
| MedCode (Vals AI) | Not measured | 33.0% | Only Qwen3.5-Flash measured |
| AA-Omniscience | 46.3 | Not measured | Only Gemini 4 Hydrogen measured |
| SimpleQA Verified | Not measured | 20.3% | Only Qwen3.5-Flash measured |
| LMArena Text: science | 1519 | 1414 | Gemini 4 Hydrogen |
| LMArena Text: medicine and healthcare | 1488 | 1408 | Gemini 4 Hydrogen |
| LMArena Text: legal and government | 1532 | 1398 | Gemini 4 Hydrogen |
| LMArena Text: business and finance | 1486 | 1395 | Gemini 4 Hydrogen |
| Neither model has a result on the other 8 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | 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 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| Vals Index | 68.5% | Not measured | Only Gemini 4 Hydrogen measured |
| LiveBench data analysis | 83.2% | Not measured | Only Gemini 4 Hydrogen measured |
| SAGE (Vals AI) | Not measured | 84.9% | Only Qwen3.5-Flash measured |
| MedScribe (Vals AI) | Not measured | 70.6% | Only Qwen3.5-Flash measured |
| DTBench | Not measured | 82.9% | Only Qwen3.5-Flash measured |
| LMCA | Not measured | 29.1% | Only Qwen3.5-Flash measured |
| LMArena Text | 1502 | 1397 | Gemini 4 Hydrogen |
| LMArena Text: instruction following | 1519 | 1375 | Gemini 4 Hydrogen |
| LMArena Text: creative writing | 1509 | 1343 | Gemini 4 Hydrogen |
| LMArena Text: English | 1499 | 1404 | Gemini 4 Hydrogen |
| LMArena Text: non-English | 1495 | 1385 | Gemini 4 Hydrogen |
| LMArena Text: Chinese | 1631 | 1447 | Gemini 4 Hydrogen |
| LMArena Text: German | Not measured | 1390 | Only Qwen3.5-Flash measured |
| LMArena Text: Japanese | Not measured | 1368 | Only Qwen3.5-Flash measured |
| LMArena Text: Korean | Not measured | 1345 | Only Qwen3.5-Flash measured |
| LMArena Text: French | 1512 | 1413 | Gemini 4 Hydrogen |
| LMArena Text: Spanish | 1494 | 1400 | Gemini 4 Hydrogen |
| LMArena Text: Russian | 1492 | 1380 | Gemini 4 Hydrogen |
| LMArena Text: Polish | Not measured | 1377 | Only Qwen3.5-Flash measured |
| LMArena Text: multi-turn | 1485 | 1393 | Gemini 4 Hydrogen |
| LMArena Text: longer queries | 1524 | 1392 | Gemini 4 Hydrogen |
| LMArena Text: writing and language | 1500 | 1369 | Gemini 4 Hydrogen |
| LMArena Text: entertainment and media | 1503 | 1348 | Gemini 4 Hydrogen |
| Neither model has a result on the other 26 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Hydrogen | Qwen3.5-Flash | 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
Qwen3.5-Flash costs less
Repository review
50K input + 3K output tokens
Qwen3.5-Flash costs less
Agent loop
200K input + 10K output tokens
Qwen3.5-Flash 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 | Qwen3.5-Flash |
|---|---|---|
| Maker | Qwen | |
| Weights | No public weights listed | No public weights listed |
| Released | November 12, 2026 | February 25, 2026 |
| Context window | 1.05M | 1M |
| Input $/Mtok | $1.50 | $0.065 |
| Output $/Mtok | $7.50 | $0.26 |
| Coding index | 77.9 | 41.1 |
| Independent measurements behind it | 4 | 2 |
| Cost per solved task | Not computable | $0.40 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Hydrogen better than Qwen3.5-Flash for coding?
Pick Gemini 4 Hydrogen for coding: it scores 77.9 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash. Pick Qwen3.5-Flash for output tokens 28.8x cheaper ($0.26 vs $7.50 per million).
Which is cheaper, Gemini 4 Hydrogen or Qwen3.5-Flash?
Gemini 4 Hydrogen costs $1.50 per million input tokens and $7.50 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Cost per solved task is known for Qwen3.5-Flash only.
Which has the bigger context window, Gemini 4 Hydrogen or Qwen3.5-Flash?
Gemini 4 Hydrogen, with 1.05M tokens against 1M.
How many benchmarks is the Gemini 4 Hydrogen vs Qwen3.5-Flash comparison based on?
27 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Hydrogen's coding index rests on 4 independent benchmarks and Qwen3.5-Flash's on 2. Where only one model has a result, the page says so instead of naming a winner.