Grok 4.3 vs Qwen3.5-Flash
Qwen3.5-Flash leads Grok 4.3 on coding, 41.1 to 37.4 on the Vibe Coding Index, and Qwen3.5-Flash costs 9.6x less per output token ($0.26 vs $2.50 per million). Updated October 22, 2026; 52 benchmarks have a result for both.
Grok 4.3 or Qwen3.5-Flash: which to pick
Pick Qwen3.5-Flash for coding: it scores 41.1 on the Vibe Coding Index against 37.4 for Grok 4.3, though on 2 benchmarks against 3.
Pick Grok 4.3 for a lower cost per solved task ($0.31 against $0.40) and work measured by LMArena WebDev or LiveCodeBench (Vals AI), where it leads.
- Shared results
- 52
- Grok 4.3 only
- 53
- Qwen3.5-Flash only
- 3
- 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
Qwen3.5-Flash
Qwen3.5-Flash scores 41.1 against 37.4.
3 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Grok 4.3 has a AA Intelligence Index result, 24.9.
Directional only
Agentic work
AA Agentic Index
No call
Only Grok 4.3 has a AA Agentic Index result, 15.5.
Directional only
Reasoning
GPQA Diamond
Grok 4.3
Grok 4.3 leads, 91.4% against 82.8%.
Same board, both measured
Math
AIME
No call
Only Qwen3.5-Flash has a AIME result, 92.5%.
Directional only
Knowledge
MMLU Pro
Grok 4.3
Grok 4.3 leads, 85.8% against 84.1%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Grok 4.3 has a Design Arena: websites result, 1196.
Directional only
Long documents
Listed context window
No call
Both take 1M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5-Flash
Grok 4.3 $0.0025, Qwen3.5-Flash $0.0002 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Grok 4.3
Grok 4.3 $0.31, Qwen3.5-Flash $0.40.
Published attempt cost and pass rate
At a glance
- Coding index
- Grok 4.3 37.4 from 3 benchmarks, Qwen3.5-Flash 41.1 from 2 benchmarks.
- Widest category
- Coding, 10.1 points apart on average over 8 shared benchmarks.
- Widest single gap
- FrontierMath, tiers 1 to 3: Grok 4.3 42.8% against Qwen3.5-Flash 18.2%, 24.6 points apart on a 0 to 100 scale.
- Output price
- Grok 4.3 $2.50 against Qwen3.5-Flash $0.26 per million output tokens, 9.6x apart.
- Context window
- Both take 1M tokens.
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 | Grok 4.3 | Bars | Qwen3.5-Flash | Ties |
|---|---|---|---|---|
| Coding | 7 | 1 | ||
| Reasoning | 4 | 3 | ||
| Math | 2 | 2 | ||
| Knowledge | 6 | 6 | ||
| General | 14 | 7 | ||
| All shared boards | 33 | 19 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index71
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| LMArena WebDev | 1358 | 1244 | Grok 4.3 |
| AA Coding Index | 42.2 | Not measured | Only Grok 4.3 measured |
| LiveCodeBench (Vals AI) | 84.5% | 83.3% | Grok 4.3 |
| SWE-bench Verified (Vals AI) | 71.4% | 64.4% | Grok 4.3 |
| Vibe Code Bench (Vals AI) | 19.4% | Not measured | Only Grok 4.3 measured |
| Code migration (Vals AI) | 6.8% | Not measured | Only Grok 4.3 measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Grok 4.3 measured |
| Terminal-Bench 2.1 (Vals AI) | 42.0% | Not measured | Only Grok 4.3 measured |
| SkillsBench (Vals AI) | 40.6% | Not measured | Only Grok 4.3 measured |
| SciCode | 48.3% | Not measured | Only Grok 4.3 measured |
| Terminal-Bench Hard (Artificial Analysis run) | 37.9% | Not measured | Only Grok 4.3 measured |
| WeirdML | 49.9% | Not measured | Only Grok 4.3 measured |
| ALE-Bench | 944.2 | 265.9 | Grok 4.3 |
| LMArena Text: coding | 1415 | 1412 | Grok 4.3 |
| LMArena Text: software and IT | 1416 | 1416 | Qwen3.5-Flash |
| LMArena WebDev: React | 1353 | 1229 | Grok 4.3 |
| LMArena WebDev: HTML | 1367 | 1291 | Grok 4.3 |
| LMArena WebDev: from an image | 1375 | Not measured | Only Grok 4.3 measured |
| Neither model has a result on the other 21 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| AA Intelligence Index | 24.9 | Not measured | Only Grok 4.3 measured |
| Epoch Capabilities Index | Not measured | 143.5 | Only Qwen3.5-Flash measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index17 boards, none shared
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| AA Agentic Index | 15.5 | Not measured | Only Grok 4.3 measured |
| Design Arena: agents building web apps | 1126 | Not measured | Only Grok 4.3 measured |
| Design Arena: agents building full-stack apps | 1006 | Not measured | Only Grok 4.3 measured |
| Design Arena: agents building mobile apps | 1058 | Not measured | Only Grok 4.3 measured |
| Design Arena: agents building Android apps | 962 | Not measured | Only Grok 4.3 measured |
| Design Arena: agents building Godot games | 914 | Not measured | Only Grok 4.3 measured |
| Design Arena: agents building games | 1007 | Not measured | Only Grok 4.3 measured |
| Design Arena: HTML slides | 959 | Not measured | Only Grok 4.3 measured |
| Design Arena: PowerPoint slides | 988 | Not measured | Only Grok 4.3 measured |
| Design Arena: spreadsheets | 879 | Not measured | Only Grok 4.3 measured |
| Finance Agent (Vals AI) | 37.7% | Not measured | Only Grok 4.3 measured |
| Tax Agent Bench (Vals AI) | 6.2% | Not measured | Only Grok 4.3 measured |
| Legal Research Bench (Vals AI) | 15.4% | Not measured | Only Grok 4.3 measured |
| Excel Modeling Benchmark (Vals AI) | 18.4% | Not measured | Only Grok 4.3 measured |
| τ²-Bench Telecom | 97.7% | Not measured | Only Grok 4.3 measured |
| Vending-Bench 2 | $35 | Not measured | Only Grok 4.3 measured |
| LMArena Search | 1166 | Not measured | Only Grok 4.3 measured |
| Neither model has a result on the other 24 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index43
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| GPQA Diamond | 91.4% | 82.8% | Grok 4.3 |
| MMMU Pro (Vals AI) | 83.1% | 81.9% | Grok 4.3 |
| GPQA Diamond (Artificial Analysis run) | 90.1% | Not measured | Only Grok 4.3 measured |
| Humanity's Last Exam (Artificial Analysis run) | 37.2% | Not measured | Only Grok 4.3 measured |
| GPQA Diamond (Epoch AI run) | 88.8% | 82.3% | Grok 4.3 |
| Chess puzzles | 18.0% | 14.0% | Grok 4.3 |
| Mystery game puzzles | Not measured | 20.0% | Only Qwen3.5-Flash measured |
| LMArena Text: hard prompts | 1396 | 1403 | Qwen3.5-Flash |
| LMArena Text: expert | 1384 | 1407 | Qwen3.5-Flash |
| LMArena Text: hard prompts in English | 1402 | 1409 | Qwen3.5-Flash |
| LMArena Vision: diagrams | 1241 | Not measured | Only Grok 4.3 measured |
| LMArena Vision: homework | 1241 | Not measured | Only Grok 4.3 measured |
| Neither model has a result on the other 10 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index22
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| AIME | Not measured | 92.5% | Only Qwen3.5-Flash measured |
| OTIS Mock AIME | 93.3% | 84.4% | Grok 4.3 |
| FrontierMath, tiers 1 to 3 | 42.8% | 18.2% | Grok 4.3 |
| FrontierMath, tier 4 | 14.6% | Not measured | Only Grok 4.3 measured |
| ProofBench | 11.0% | Not measured | Only Grok 4.3 measured |
| LMArena Text: math | 1387 | 1407 | Qwen3.5-Flash |
| LMArena Text: mathematical work | 1396 | 1413 | Qwen3.5-Flash |
| Neither model has a result on the other 6 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index66
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| MMLU Pro | 85.8% | 84.1% | Grok 4.3 |
| LegalBench (Vals AI) | 84.5% | 84.3% | Grok 4.3 |
| CaseLaw (Vals AI) | 79.3% | 56.0% | Grok 4.3 |
| CorpFin (Vals AI) | 68.5% | 63.6% | Grok 4.3 |
| TaxEval (Vals AI) | 70.8% | 72.2% | Qwen3.5-Flash |
| MortgageTax (Vals AI) | 48.3% | 67.4% | Qwen3.5-Flash |
| MedCode (Vals AI) | 38.1% | 33.0% | Grok 4.3 |
| SimpleQA Verified | 33.2% | 20.3% | Grok 4.3 |
| LMArena Text: science | 1399 | 1415 | Qwen3.5-Flash |
| LMArena Text: medicine and healthcare | 1384 | 1407 | Qwen3.5-Flash |
| LMArena Text: legal and government | 1386 | 1398 | Qwen3.5-Flash |
| LMArena Text: business and finance | 1381 | 1394 | Qwen3.5-Flash |
| Neither model has a result on the other 6 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| Design Arena: websites | 1196 | Not measured | Only Grok 4.3 measured |
| Design Arena: UI components | 1190 | Not measured | Only Grok 4.3 measured |
| Design Arena: game dev | 1173 | Not measured | Only Grok 4.3 measured |
| Design Arena: data viz | 1179 | Not measured | Only Grok 4.3 measured |
| Design Arena: 3D | 1124 | Not measured | Only Grok 4.3 measured |
| Design Arena: all code categories | 1186 | Not measured | Only Grok 4.3 measured |
| Design Arena: SVG | 1080 | Not measured | Only Grok 4.3 measured |
| Design Arena: ASCII art | 1125 | Not measured | Only Grok 4.3 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index147
| Benchmark | Grok 4.3 | Qwen3.5-Flash | Leader |
|---|---|---|---|
| Public Benefits Bench (Vals AI) | 51.7% | Not measured | Only Grok 4.3 measured |
| SAGE (Vals AI) | 19.7% | 42.5% | Qwen3.5-Flash |
| MedScribe (Vals AI) | 74.4% | 70.6% | Grok 4.3 |
| Vals Multimodal Index | 43.3% | Not measured | Only Grok 4.3 measured |
| IFBench | 83.3% | Not measured | Only Grok 4.3 measured |
| Long context reasoning (AA-LCR) | 75.0% | Not measured | Only Grok 4.3 measured |
| DTBench | 90.7% | 82.9% | Grok 4.3 |
| LMCA | 38.3% | 29.1% | Grok 4.3 |
| LMArena Text | 1397 | 1397 | Qwen3.5-Flash |
| LMArena Text: instruction following | 1366 | 1374 | Qwen3.5-Flash |
| LMArena Text: creative writing | 1380 | 1343 | Grok 4.3 |
| LMArena Vision | 1229 | Not measured | Only Grok 4.3 measured |
| LMArena Text: English | 1404 | 1404 | Qwen3.5-Flash |
| LMArena Text: non-English | 1385 | 1385 | Grok 4.3 |
| LMArena Text: Chinese | 1422 | 1445 | Qwen3.5-Flash |
| LMArena Text: German | 1395 | 1390 | Grok 4.3 |
| LMArena Text: Japanese | 1379 | 1369 | Grok 4.3 |
| LMArena Text: Korean | 1354 | 1344 | Grok 4.3 |
| LMArena Text: French | 1411 | 1413 | Qwen3.5-Flash |
| LMArena Text: Spanish | 1399 | 1400 | Qwen3.5-Flash |
| LMArena Text: Russian | 1399 | 1380 | Grok 4.3 |
| LMArena Text: Polish | 1398 | 1376 | Grok 4.3 |
| LMArena Text: multi-turn | 1406 | 1393 | Grok 4.3 |
| LMArena Text: longer queries | 1393 | 1392 | Grok 4.3 |
| LMArena Text: writing and language | 1385 | 1369 | Grok 4.3 |
| LMArena Text: entertainment and media | 1370 | 1347 | Grok 4.3 |
| LMArena Vision: English | 1235 | Not measured | Only Grok 4.3 measured |
| LMArena Vision: Chinese | 1257 | Not measured | Only Grok 4.3 measured |
| LMArena Vision: reading text | 1235 | Not measured | Only Grok 4.3 measured |
| LMArena Vision: humor | 1222 | Not measured | Only Grok 4.3 measured |
| LMArena Vision: recognizing things | 1217 | Not measured | Only Grok 4.3 measured |
| LMArena Vision: creative writing | 1237 | Not measured | Only Grok 4.3 measured |
| Neither model has a result on the other 14 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Grok 4.3 | 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 | SpaceXAI Grok 4.3 | Qwen3.5-Flash |
|---|---|---|
| Maker | xAI | Qwen |
| Weights | No public weights listed | No public weights listed |
| Released | April 30, 2026 | February 25, 2026 |
| Context window | 1M | 1M |
| Input $/Mtok | $1.25 | $0.065 |
| Output $/Mtok | $2.50 | $0.26 |
| Coding index | 37.4 | 41.1 |
| Independent measurements behind it | 3 | 2 |
| Cost per solved task | $0.31 | $0.40 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Grok 4.3 better than Qwen3.5-Flash for coding?
Pick Qwen3.5-Flash for coding: it scores 41.1 on the Vibe Coding Index against 37.4 for Grok 4.3, though on 2 benchmarks against 3. Pick Grok 4.3 for a lower cost per solved task ($0.31 against $0.40) and work measured by LMArena WebDev or LiveCodeBench (Vals AI), where it leads.
Which is cheaper, Grok 4.3 or Qwen3.5-Flash?
Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Qwen3.5-Flash $0.40.
Which has the bigger context window, Grok 4.3 or Qwen3.5-Flash?
Neither: both take 1M tokens.
How many benchmarks is the Grok 4.3 vs Qwen3.5-Flash comparison based on?
52 benchmarks have a result for both models as of October 22, 2026. Grok 4.3's coding index rests on 3 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.