Gemini 4 Carbon vs Qwen3.5 Plus 2026-04-20
Gemini 4 Carbon leads Qwen3.5 Plus 2026-04-20 on coding, 86.6 to 39.5 on the Vibe Coding Index, and Qwen3.5 Plus 2026-04-20 costs 5.6x less per output token ($1.80 vs $10.00 per million). Updated November 14, 2026; 9 benchmarks have a result for both.
Gemini 4 Carbon or Qwen3.5 Plus 2026-04-20: which to pick
Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 39.5 for Qwen3.5 Plus 2026-04-20.
Pick Qwen3.5 Plus 2026-04-20 for output tokens 5.6x cheaper ($1.80 vs $10.00 per million).
- Shared results
- 9
- Gemini 4 Carbon only
- 64
- Qwen3.5 Plus 2026-04-20 only
- 15
- 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 Carbon
Gemini 4 Carbon scores 86.6 against 39.5.
4 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Gemini 4 Carbon has a AA Intelligence Index result, 60.0.
Directional only
Reasoning
GPQA Diamond
No call
Only Qwen3.5 Plus 2026-04-20 has a GPQA Diamond result, 87.4%.
Directional only
Math
AIME
No call
Only Qwen3.5 Plus 2026-04-20 has a AIME result, 86.0%.
Directional only
Knowledge
MMLU Pro
No call
Only Qwen3.5 Plus 2026-04-20 has a MMLU Pro result, 87.2%.
Directional only
Web design
Design Arena: websites
No call
Only Gemini 4 Carbon has a Design Arena: websites result, 1319.
Directional only
General
Vals Index
No call
Only Gemini 4 Carbon has a Vals Index result, 70.5%.
Directional only
Long documents
Listed context window
Gemini 4 Carbon
Gemini 4 Carbon takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5 Plus 2026-04-20
Gemini 4 Carbon $0.0070, Qwen3.5 Plus 2026-04-20 $0.0012 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Qwen3.5 Plus 2026-04-20 has the number, $1.35.
Directional only
At a glance
- Coding index
- Gemini 4 Carbon 86.6 from 4 benchmarks, Qwen3.5 Plus 2026-04-20 39.5 from 2 benchmarks.
- Widest category
- Agentic work, 100.0 points apart on average over 1 shared benchmark.
- Widest single gap
- Vending-Bench 2: Gemini 4 Carbon $16,484 against Qwen3.5 Plus 2026-04-20 $1, 100.0 points apart on a 0 to 100 scale.
- Output price
- Gemini 4 Carbon $10.00 against Qwen3.5 Plus 2026-04-20 $1.80 per million output tokens, 5.6x apart.
- Context window
- Gemini 4 Carbon takes 1.05M tokens, Qwen3.5 Plus 2026-04-20 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 Carbon | Bars | Qwen3.5 Plus 2026-04-20 | Ties |
|---|---|---|---|---|
| Coding | 2 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 3 | 0 | ||
| Math | 1 | 0 | ||
| Knowledge | 1 | 0 | ||
| All shared boards | 9 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| LiveBench coding | 91.0% | Not measured | Only Gemini 4 Carbon measured |
| LMArena WebDev | 1768 | Not measured | Only Gemini 4 Carbon measured |
| LiveCodeBench (Vals AI) | Not measured | 85.3% | Only Qwen3.5 Plus 2026-04-20 measured |
| SWE-bench Verified (Vals AI) | Not measured | 71.2% | Only Qwen3.5 Plus 2026-04-20 measured |
| Terminal-Bench 4 (Vals AI) | 63.1% | Not measured | Only Gemini 4 Carbon measured |
| Vibe Code Bench (Vals AI) | 89.1% | 15.7% | Gemini 4 Carbon |
| Terminal-Bench 4.0 (Artificial Analysis run) | 65.2% | Not measured | Only Gemini 4 Carbon measured |
| FrontierCode 2.0 | 40.6% | Not measured | Only Gemini 4 Carbon measured |
| FrontierSWE | 61.2% | Not measured | Only Gemini 4 Carbon measured |
| ALE-Bench | 2374.7 | 608.9 | Gemini 4 Carbon |
| LMArena Text: coding | 1564 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: software and IT | 1552 | Not measured | Only Gemini 4 Carbon measured |
| LMArena WebDev: React | 1792 | Not measured | Only Gemini 4 Carbon measured |
| LMArena WebDev: HTML | 1770 | Not measured | Only Gemini 4 Carbon measured |
| CursorBench 4.0 | 60.4% | Not measured | Only Gemini 4 Carbon measured |
| Neither model has a result on the other 37 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| AA Intelligence Index | 60.0 | Not measured | Only Gemini 4 Carbon measured |
| Epoch Capabilities Index | 169.8 | 147.3 | Gemini 4 Carbon |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| Design Arena: agents building mobile apps | 1284 | Not measured | Only Gemini 4 Carbon measured |
| Design Arena: spreadsheets | 1224 | Not measured | Only Gemini 4 Carbon measured |
| LiveBench research | 92.5% | Not measured | Only Gemini 4 Carbon measured |
| LiveBench browser | 80.0% | Not measured | Only Gemini 4 Carbon measured |
| LiveBench long agentic | 72.7% | Not measured | Only Gemini 4 Carbon measured |
| Tax Agent Bench (Vals AI) | 51.8% | Not measured | Only Gemini 4 Carbon measured |
| Legal Research Bench (Vals AI) | 55.8% | Not measured | Only Gemini 4 Carbon measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 17.5% | Not measured | Only Gemini 4 Carbon measured |
| APEX-Agents | 84.2% | Not measured | Only Gemini 4 Carbon measured |
| Vending-Bench 2 | $16,484 | $1 | Gemini 4 Carbon |
| Neither model has a result on the other 34 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 87.4% | Only Qwen3.5 Plus 2026-04-20 measured |
| LiveBench reasoning | 90.6% | Not measured | Only Gemini 4 Carbon measured |
| MMMU Pro (Vals AI) | Not measured | 22.8% | Only Qwen3.5 Plus 2026-04-20 measured |
| HLE-Diamond (Artificial Analysis run) | 69.1% | Not measured | Only Gemini 4 Carbon measured |
| CritPt v2, hard subset (Artificial Analysis run) | 69.0% | Not measured | Only Gemini 4 Carbon measured |
| GPQA Diamond (Epoch AI run) | 96.5% | 84.8% | Gemini 4 Carbon |
| ARC-AGI | 98.5% | Not measured | Only Gemini 4 Carbon measured |
| ARC-AGI-2 | 94.2% | Not measured | Only Gemini 4 Carbon measured |
| SimpleBench | 92.6% | Not measured | Only Gemini 4 Carbon measured |
| Chess puzzles | 78.0% | 9.0% | Gemini 4 Carbon |
| Mystery game puzzles | 73.0% | 17.0% | Gemini 4 Carbon |
| EBR-bench | 87.6% | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: hard prompts | 1551 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: expert | 1582 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: hard prompts in English | 1545 | Not measured | Only Gemini 4 Carbon measured |
| Neither model has a result on the other 11 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| AIME | Not measured | 86.0% | Only Qwen3.5 Plus 2026-04-20 measured |
| OTIS Mock AIME | 100.0% | 86.7% | Gemini 4 Carbon |
| FrontierMath, tiers 1 to 3 | 90.5% | Not measured | Only Gemini 4 Carbon measured |
| FrontierMath, tier 4 | 95.1% | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: mathematical work | 1538 | Not measured | Only Gemini 4 Carbon measured |
| MathArena | 85.4% | Not measured | Only Gemini 4 Carbon measured |
| Neither model has a result on the other 8 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 87.2% | Only Qwen3.5 Plus 2026-04-20 measured |
| LegalBench (Vals AI) | Not measured | 85.1% | Only Qwen3.5 Plus 2026-04-20 measured |
| CaseLaw (Vals AI) | Not measured | 59.7% | Only Qwen3.5 Plus 2026-04-20 measured |
| CorpFin (Vals AI) | Not measured | 65.3% | Only Qwen3.5 Plus 2026-04-20 measured |
| MortgageTax (Vals AI) | Not measured | 60.8% | Only Qwen3.5 Plus 2026-04-20 measured |
| MedQA (Vals AI) | Not measured | 95.2% | Only Qwen3.5 Plus 2026-04-20 measured |
| AA-Omniscience | 53.5 | Not measured | Only Gemini 4 Carbon measured |
| SimpleQA Verified | 77.7% | 25.4% | Gemini 4 Carbon |
| LMArena Text: science | 1535 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: medicine and healthcare | 1525 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: legal and government | 1542 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: business and finance | 1520 | Not measured | Only Gemini 4 Carbon measured |
| FACTS Benchmark Suite | 78.4% | Not measured | Only Gemini 4 Carbon measured |
| PRBench Legal | 53.3% | Not measured | Only Gemini 4 Carbon measured |
| Neither model has a result on the other 7 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| Design Arena: websites | 1319 | Not measured | Only Gemini 4 Carbon measured |
| Design Arena: UI components | 1357 | Not measured | Only Gemini 4 Carbon measured |
| Design Arena: game dev | 1326 | Not measured | Only Gemini 4 Carbon measured |
| Design Arena: 3D | 1434 | Not measured | Only Gemini 4 Carbon measured |
| Design Arena: all code categories | 1348 | Not measured | Only Gemini 4 Carbon measured |
| LiveBench design | 80.2% | Not measured | Only Gemini 4 Carbon measured |
| Neither model has a result on the other 3 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index20 boards, none shared
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | Leader |
|---|---|---|---|
| Vals Index | 70.5% | Not measured | Only Gemini 4 Carbon measured |
| LiveBench data analysis | 86.5% | Not measured | Only Gemini 4 Carbon measured |
| Long context reasoning (AA-LCR) | 79.3% | Not measured | Only Gemini 4 Carbon measured |
| GDPval-AA | 1733 | Not measured | Only Gemini 4 Carbon measured |
| DTBench | Not measured | 80.5% | Only Qwen3.5 Plus 2026-04-20 measured |
| LMCA | Not measured | 36.4% | Only Qwen3.5 Plus 2026-04-20 measured |
| CL-bench | Not measured | 19.8% | Only Qwen3.5 Plus 2026-04-20 measured |
| Furniture assembly | 77.5% | Not measured | Only Gemini 4 Carbon measured |
| CL-bench Life | Not measured | 12.4% | Only Qwen3.5 Plus 2026-04-20 measured |
| LMArena Text | 1538 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: instruction following | 1539 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: creative writing | 1533 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: English | 1530 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: non-English | 1534 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: Chinese | 1613 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: Russian | 1560 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: multi-turn | 1569 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: longer queries | 1549 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: writing and language | 1542 | Not measured | Only Gemini 4 Carbon measured |
| LMArena Text: entertainment and media | 1527 | Not measured | Only Gemini 4 Carbon measured |
| Neither model has a result on the other 29 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 4 Carbon | Qwen3.5 Plus 2026-04-20 | 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 Plus 2026-04-20 costs less
Repository review
50K input + 3K output tokens
Qwen3.5 Plus 2026-04-20 costs less
Agent loop
200K input + 10K output tokens
Qwen3.5 Plus 2026-04-20 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 Carbon | Qwen3.5 Plus 2026-04-20 |
|---|---|---|
| Maker | Qwen | |
| Weights | No public weights listed | No public weights listed |
| Released | November 10, 2026 | April 27, 2026 |
| Context window | 1.05M | 1M |
| Input $/Mtok | $2.00 | $0.30 |
| Output $/Mtok | $10.00 | $1.80 |
| Coding index | 86.6 | 39.5 |
| Independent measurements behind it | 4 | 2 |
| Cost per solved task | Not computable | $1.35 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 4 Carbon better than Qwen3.5 Plus 2026-04-20 for coding?
Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 39.5 for Qwen3.5 Plus 2026-04-20. Pick Qwen3.5 Plus 2026-04-20 for output tokens 5.6x cheaper ($1.80 vs $10.00 per million).
Which is cheaper, Gemini 4 Carbon or Qwen3.5 Plus 2026-04-20?
Gemini 4 Carbon costs $2.00 per million input tokens and $10.00 per million output tokens; Qwen3.5 Plus 2026-04-20 costs $0.30 and $1.80. Cost per solved task is known for Qwen3.5 Plus 2026-04-20 only.
Which has the bigger context window, Gemini 4 Carbon or Qwen3.5 Plus 2026-04-20?
Gemini 4 Carbon, with 1.05M tokens against 1M.
How many benchmarks is the Gemini 4 Carbon vs Qwen3.5 Plus 2026-04-20 comparison based on?
9 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Carbon's coding index rests on 4 independent benchmarks and Qwen3.5 Plus 2026-04-20's on 2. Where only one model has a result, the page says so instead of naming a winner.