GPT-6 Luna vs Qwen3.5 397B A17B
GPT-6 Luna leads Qwen3.5 397B A17B on the Artificial Analysis Intelligence Index, 38.1 to 21.4, and GPT-6 Luna costs 4.7x less per output token ($0.50 vs $2.34 per million). Updated October 22, 2026; 58 benchmarks have a result for both.
GPT-6 Luna or Qwen3.5 397B A17B: which to pick
Only GPT-6 Luna has a coding score, 57.3 on the Vibe Coding Index; Qwen3.5 397B A17B has none, so the two cannot be ranked on coding.
Pick Qwen3.5 397B A17B for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.
- Shared results
- 58
- GPT-6 Luna only
- 46
- Qwen3.5 397B A17B only
- 8
- Like-for-like categories
- 8 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
No call
Only GPT-6 Luna has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
GPT-6 Luna
GPT-6 Luna leads, 38.1 against 21.4.
Same board, both measured
Web design
Design Arena: websites
GPT-6 Luna
GPT-6 Luna leads, 1271 against 1190.
Same board, both measured
General
Vals Index
No call
Only GPT-6 Luna has a Vals Index result, 52.3%.
Directional only
Long documents
Listed context window
GPT-6 Luna
GPT-6 Luna takes 1.05M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-6 Luna
GPT-6 Luna $0.0003, Qwen3.5 397B A17B $0.0016 per turn.
List prices
At a glance
- Coding index
- GPT-6 Luna 57.3 from 5 benchmarks, Qwen3.5 397B A17B not benchmarked.
- Widest category
- Coding, 20.0 points apart on average over 7 shared benchmarks.
- Widest single gap
- FrontierMath, tiers 1 to 3: GPT-6 Luna 78.9% against Qwen3.5 397B A17B 31.2%, 47.7 points apart on a 0 to 100 scale.
- Output price
- GPT-6 Luna $0.50 against Qwen3.5 397B A17B $2.34 per million output tokens, 4.7x apart.
- Context window
- GPT-6 Luna takes 1.05M tokens, Qwen3.5 397B A17B 262K.
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 | GPT-6 Luna | Bars | Qwen3.5 397B A17B | Ties |
|---|---|---|---|---|
| Coding | 5 | 2 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 2 | 6 | ||
| Math | 2 | 2 | ||
| Knowledge | 0 | 4 | ||
| Web design | 7 | 0 | ||
| General | 3 | 22 | ||
| All shared boards | 22 | 36 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index52
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| LiveBench coding | 84.5% | Not measured | Only GPT-6 Luna measured |
| LMArena WebDev | 1578 | 1400 | GPT-6 Luna |
| Terminal-Bench 4 (Vals AI) | 13.6% | Not measured | Only GPT-6 Luna measured |
| Vibe Code Bench (Vals AI) | 81.7% | Not measured | Only GPT-6 Luna measured |
| Code migration (Vals AI) | 42.5% | Not measured | Only GPT-6 Luna measured |
| ProgramBench (Vals AI) | 0.5% | Not measured | Only GPT-6 Luna measured |
| IOI (Vals AI) | 55.6% | Not measured | Only GPT-6 Luna measured |
| Terminal-Bench 2.1 (Vals AI) | 73.0% | Not measured | Only GPT-6 Luna measured |
| SWE-bench Multimodal (Vals AI) | 37.5% | Not measured | Only GPT-6 Luna measured |
| CyberBench (Vals AI) | 76.3% | Not measured | Only GPT-6 Luna measured |
| SciCode | 54.6% | 44.8% | GPT-6 Luna |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 40.9% | Only Qwen3.5 397B A17B measured |
| FrontierCode | 42.4% | Not measured | Only GPT-6 Luna measured |
| ALE-Bench | 1576.9 | 621.9 | GPT-6 Luna |
| LMArena Text: coding | 1437 | 1464 | Qwen3.5 397B A17B |
| LMArena Text: software and IT | 1423 | 1463 | Qwen3.5 397B A17B |
| LMArena WebDev: React | 1573 | 1388 | GPT-6 Luna |
| LMArena WebDev: HTML | 1595 | 1410 | GPT-6 Luna |
| LMArena WebDev: from an image | 1571 | Not measured | Only GPT-6 Luna measured |
| Neither model has a result on the other 24 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| AA Intelligence Index | 38.1 | 21.4 | GPT-6 Luna |
| Epoch Capabilities Index | 156.8 | 146.8 | GPT-6 Luna |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | 1191 | Not measured | Only GPT-6 Luna measured |
| Design Arena: agents building full-stack apps | 1158 | Not measured | Only GPT-6 Luna measured |
| Design Arena: agents building mobile apps | 1131 | Not measured | Only GPT-6 Luna measured |
| LiveBench research | 43.5% | Not measured | Only GPT-6 Luna measured |
| LiveBench browser | 72.0% | Not measured | Only GPT-6 Luna measured |
| LiveBench long agentic | 48.1% | Not measured | Only GPT-6 Luna measured |
| SREBench (Vals AI) | 2.7% | Not measured | Only GPT-6 Luna measured |
| Finance Agent (Vals AI) | 49.9% | Not measured | Only GPT-6 Luna measured |
| Tax Agent Bench (Vals AI) | 19.9% | Not measured | Only GPT-6 Luna measured |
| Legal Research Bench (Vals AI) | 30.3% | Not measured | Only GPT-6 Luna measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 4.2% | Not measured | Only GPT-6 Luna measured |
| Excel Modeling Benchmark (Vals AI) | 68.5% | Not measured | Only GPT-6 Luna measured |
| BioMysteryBench (Vals AI) | 61.5% | Not measured | Only GPT-6 Luna measured |
| Terminal-Bench-Science (Vals AI) | 4.3% | Not measured | Only GPT-6 Luna measured |
| Vals Science Index | 28.4% | Not measured | Only GPT-6 Luna measured |
| τ²-Bench Telecom | Not measured | 95.6% | Only Qwen3.5 397B A17B measured |
| APEX-Agents | 44.3% | 24.9% | GPT-6 Luna |
| SpireClimb | 0.0% | Not measured | Only GPT-6 Luna measured |
| Neither model has a result on the other 24 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index26
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| LiveBench reasoning | 81.8% | Not measured | Only GPT-6 Luna measured |
| MysteryMechanism (Vals AI) | 19.4% | Not measured | Only GPT-6 Luna measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 89.3% | Only Qwen3.5 397B A17B measured |
| Humanity's Last Exam (Artificial Analysis run) | 38.5% | 29.0% | GPT-6 Luna |
| GPQA Diamond (Epoch AI run) | 90.5% | 86.4% | GPT-6 Luna |
| ARC-AGI | 86.7% | Not measured | Only GPT-6 Luna measured |
| ARC-AGI-2 | 59.3% | Not measured | Only GPT-6 Luna measured |
| Chess puzzles | 36.0% | Not measured | Only GPT-6 Luna measured |
| Mystery game puzzles | 7.0% | 18.0% | Qwen3.5 397B A17B |
| LMArena Text: hard prompts | 1410 | 1448 | Qwen3.5 397B A17B |
| LMArena Text: expert | 1442 | 1462 | Qwen3.5 397B A17B |
| LMArena Text: hard prompts in English | 1410 | 1450 | Qwen3.5 397B A17B |
| LMArena Vision: diagrams | 1245 | 1277 | Qwen3.5 397B A17B |
| LMArena Vision: homework | 1261 | 1292 | Qwen3.5 397B A17B |
| Neither model has a result on the other 9 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index22
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| OTIS Mock AIME | 98.9% | 88.9% | GPT-6 Luna |
| FrontierMath, tiers 1 to 3 | 78.9% | 31.2% | GPT-6 Luna |
| FrontierMath, tier 4 | 56.1% | Not measured | Only GPT-6 Luna measured |
| ProofBench | 64.0% | Not measured | Only GPT-6 Luna measured |
| LMArena Text: math | 1409 | 1453 | Qwen3.5 397B A17B |
| LMArena Text: mathematical work | 1427 | 1454 | Qwen3.5 397B A17B |
| MathArena | Not measured | 19.2% | Only Qwen3.5 397B A17B measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| MedCode (Vals AI) | 44.7% | Not measured | Only GPT-6 Luna measured |
| SimpleQA Verified | 41.4% | Not measured | Only GPT-6 Luna measured |
| LMArena Text: science | 1386 | 1457 | Qwen3.5 397B A17B |
| LMArena Text: medicine and healthcare | 1352 | 1455 | Qwen3.5 397B A17B |
| LMArena Text: legal and government | 1400 | 1441 | Qwen3.5 397B A17B |
| LMArena Text: business and finance | 1388 | 1435 | Qwen3.5 397B A17B |
| FACTS Benchmark Suite | 63.3% | Not measured | Only GPT-6 Luna measured |
| PRBench Legal | 42.9% | Not measured | Only GPT-6 Luna measured |
| Neither model has a result on the other 12 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index70
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| Design Arena: websites | 1271 | 1190 | GPT-6 Luna |
| Design Arena: UI components | 1295 | 1161 | GPT-6 Luna |
| Design Arena: game dev | 1258 | 1140 | GPT-6 Luna |
| Design Arena: data viz | 1217 | 1175 | GPT-6 Luna |
| Design Arena: 3D | 1218 | 1160 | GPT-6 Luna |
| Design Arena: all code categories | 1270 | 1179 | GPT-6 Luna |
| Design Arena: SVG | 1253 | 1139 | GPT-6 Luna |
| Design Arena: ASCII art | 1153 | Not measured | Only GPT-6 Luna measured |
| LiveBench design | 82.5% | Not measured | Only GPT-6 Luna measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index322
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| Vals Index | 52.3% | Not measured | Only GPT-6 Luna measured |
| LiveBench data analysis | 73.4% | Not measured | Only GPT-6 Luna measured |
| Public Benefits Bench (Vals AI) | 57.6% | Not measured | Only GPT-6 Luna measured |
| SAGE (Vals AI) | 48.1% | Not measured | Only GPT-6 Luna measured |
| MedScribe (Vals AI) | 83.7% | Not measured | Only GPT-6 Luna measured |
| IFBench | Not measured | 78.8% | Only Qwen3.5 397B A17B measured |
| Long context reasoning (AA-LCR) | 83.3% | 77.3% | GPT-6 Luna |
| DTBench | 90.1% | 87.5% | GPT-6 Luna |
| LMCA | 44.5% | 37.9% | GPT-6 Luna |
| Furniture assembly | 44.2% | Not measured | Only GPT-6 Luna measured |
| LMArena Text | 1389 | 1437 | Qwen3.5 397B A17B |
| LMArena Text: instruction following | 1408 | 1424 | Qwen3.5 397B A17B |
| LMArena Text: creative writing | 1363 | 1402 | Qwen3.5 397B A17B |
| LMArena Vision | 1216 | 1262 | Qwen3.5 397B A17B |
| LMArena Text: English | 1393 | 1443 | Qwen3.5 397B A17B |
| LMArena Text: non-English | 1381 | 1430 | Qwen3.5 397B A17B |
| LMArena Text: Chinese | 1427 | 1498 | Qwen3.5 397B A17B |
| LMArena Text: German | 1376 | 1445 | Qwen3.5 397B A17B |
| LMArena Text: Japanese | 1369 | 1429 | Qwen3.5 397B A17B |
| LMArena Text: Korean | 1359 | 1384 | Qwen3.5 397B A17B |
| LMArena Text: French | 1408 | 1462 | Qwen3.5 397B A17B |
| LMArena Text: Spanish | 1391 | 1441 | Qwen3.5 397B A17B |
| LMArena Text: Russian | 1392 | 1430 | Qwen3.5 397B A17B |
| LMArena Text: Polish | 1383 | 1447 | Qwen3.5 397B A17B |
| LMArena Text: multi-turn | 1392 | 1446 | Qwen3.5 397B A17B |
| LMArena Text: longer queries | 1408 | 1441 | Qwen3.5 397B A17B |
| LMArena Text: writing and language | 1384 | 1415 | Qwen3.5 397B A17B |
| LMArena Text: entertainment and media | 1364 | 1399 | Qwen3.5 397B A17B |
| LMArena Vision: English | 1204 | 1268 | Qwen3.5 397B A17B |
| LMArena Vision: Chinese | 1266 | 1314 | Qwen3.5 397B A17B |
| LMArena Vision: reading text | 1225 | 1271 | Qwen3.5 397B A17B |
| LMArena Vision: humor | Not measured | 1262 | Only Qwen3.5 397B A17B measured |
| LMArena Vision: captioning | Not measured | 1230 | Only Qwen3.5 397B A17B measured |
| LMArena Vision: recognizing things | Not measured | 1265 | Only Qwen3.5 397B A17B measured |
| LMArena Vision: creative writing | 1205 | 1260 | Qwen3.5 397B A17B |
| Neither model has a result on the other 13 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6 Luna | Qwen3.5 397B A17B | 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-6 Luna costs less
Repository review
50K input + 3K output tokens
GPT-6 Luna costs less
Agent loop
200K input + 10K output tokens
GPT-6 Luna 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 | OpenAI GPT-6 Luna | Qwen3.5 397B A17B |
|---|---|---|
| Maker | OpenAI | Qwen |
| Weights | No public weights listed | Open weights |
| Released | September 22, 2026 | February 16, 2026 |
| Context window | 1.05M | 262K |
| Input $/Mtok | $0.10 | $0.39 |
| Output $/Mtok | $0.50 | $2.34 |
| Coding index | 57.3 | Not benchmarked |
| Independent measurements behind it | 5 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6 Luna better than Qwen3.5 397B A17B for coding?
Only GPT-6 Luna has a coding score, 57.3 on the Vibe Coding Index; Qwen3.5 397B A17B has none, so the two cannot be ranked on coding. Pick Qwen3.5 397B A17B for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.
Which is cheaper, GPT-6 Luna or Qwen3.5 397B A17B?
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens; Qwen3.5 397B A17B costs $0.39 and $2.34. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6 Luna or Qwen3.5 397B A17B?
GPT-6 Luna, with 1.05M tokens against 262K.
How many benchmarks is the GPT-6 Luna vs Qwen3.5 397B A17B comparison based on?
58 benchmarks have a result for both models as of October 22, 2026. GPT-6 Luna's coding index rests on 5 independent benchmarks and Qwen3.5 397B A17B's on 1. Where only one model has a result, the page says so instead of naming a winner.