Qwen3.5-35B-A3B vs Step 5 Preview
Step 5 Preview leads Qwen3.5-35B-A3B on the Artificial Analysis Intelligence Index, 43.7 to 19.3, and Qwen3.5-35B-A3B costs 2.1x less per output token ($1.30 vs $2.70 per million). Updated October 22, 2026; 31 benchmarks have a result for both.
Qwen3.5-35B-A3B or Step 5 Preview: which to pick
Only Step 5 Preview has a coding score, 61.1 on the Vibe Coding Index; Qwen3.5-35B-A3B has none, so the two cannot be ranked on coding.
Pick Qwen3.5-35B-A3B for output tokens 2.1x cheaper ($1.30 vs $2.70 per million).
- Shared results
- 31
- Qwen3.5-35B-A3B only
- 14
- Step 5 Preview only
- 30
- 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
No call
Only Step 5 Preview has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Step 5 Preview
Step 5 Preview leads, 43.7 against 19.3.
Same board, both measured
Long documents
Listed context window
Step 5 Preview
Step 5 Preview takes 1.05M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5-35B-A3B
Qwen3.5-35B-A3B $0.0008, Step 5 Preview $0.0024 per turn.
List prices
At a glance
- Coding index
- Qwen3.5-35B-A3B not benchmarked, Step 5 Preview 61.1 from 4 benchmarks.
- Widest category
- Coding, 33.4 points apart on average over 5 shared benchmarks.
- Widest single gap
- LMArena WebDev: React: Qwen3.5-35B-A3B 1238 against Step 5 Preview 1583, 57.5 points apart on a 0 to 100 scale.
- Output price
- Qwen3.5-35B-A3B $1.30 against Step 5 Preview $2.70 per million output tokens, 2.1x apart.
- Context window
- Qwen3.5-35B-A3B takes 262K tokens, Step 5 Preview 1.05M.
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 | Qwen3.5-35B-A3B | Bars | Step 5 Preview | Ties |
|---|---|---|---|---|
| Coding | 0 | 5 | ||
| Intelligence | 0 | 1 | ||
| Reasoning | 0 | 4 | ||
| Math | 0 | 2 | ||
| Knowledge | 0 | 4 | ||
| General | 0 | 15 | ||
| All shared boards | 0 | 31 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index05
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench coding | Not measured | 85.6% | Only Step 5 Preview measured |
| LMArena WebDev | 1254 | 1567 | Step 5 Preview |
| Terminal-Bench 4 (Vals AI) | Not measured | 31.8% | Only Step 5 Preview measured |
| Vibe Code Bench (Vals AI) | Not measured | 70.4% | Only Step 5 Preview measured |
| Code migration (Vals AI) | Not measured | 39.0% | Only Step 5 Preview measured |
| IOI (Vals AI) | Not measured | 38.1% | Only Step 5 Preview measured |
| SWE-bench Multimodal (Vals AI) | Not measured | 40.8% | Only Step 5 Preview measured |
| SciCode | Not measured | 58.9% | Only Step 5 Preview measured |
| Terminal-Bench Hard (Artificial Analysis run) | 26.5% | Not measured | Only Qwen3.5-35B-A3B measured |
| ALE-Bench | 221.8 | Not measured | Only Qwen3.5-35B-A3B measured |
| LMArena Text: coding | 1410 | 1485 | Step 5 Preview |
| LMArena Text: software and IT | 1415 | 1473 | Step 5 Preview |
| LMArena WebDev: React | 1238 | 1583 | Step 5 Preview |
| LMArena WebDev: HTML | 1301 | 1556 | Step 5 Preview |
| LMArena WebDev: from an image | Not measured | 1550 | Only Step 5 Preview measured |
| Neither model has a result on the other 24 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| AA Intelligence Index | 19.3 | 43.7 | Step 5 Preview |
| Epoch Capabilities Index | 142.5 | Not measured | Only Qwen3.5-35B-A3B measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index13 boards, none shared
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench research | Not measured | 72.8% | Only Step 5 Preview measured |
| LiveBench browser | Not measured | 24.0% | Only Step 5 Preview measured |
| LiveBench long agentic | Not measured | 27.5% | Only Step 5 Preview measured |
| SREBench (Vals AI) | Not measured | 0.4% | Only Step 5 Preview measured |
| Finance Agent (Vals AI) | Not measured | 50.7% | Only Step 5 Preview measured |
| Tax Agent Bench (Vals AI) | Not measured | 27.3% | Only Step 5 Preview measured |
| Legal Research Bench (Vals AI) | Not measured | 40.4% | Only Step 5 Preview measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 57.1% | Only Step 5 Preview measured |
| BioMysteryBench (Vals AI) | Not measured | 67.4% | Only Step 5 Preview measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 2.9% | Only Step 5 Preview measured |
| Vals Science Index | Not measured | 29.6% | Only Step 5 Preview measured |
| τ²-Bench Telecom | 89.2% | Not measured | Only Qwen3.5-35B-A3B measured |
| Vending-Bench 2 | $463 | Not measured | Only Qwen3.5-35B-A3B measured |
| Neither model has a result on the other 28 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench reasoning | Not measured | 83.8% | Only Step 5 Preview measured |
| MysteryMechanism (Vals AI) | Not measured | 18.5% | Only Step 5 Preview measured |
| GPQA Diamond (Artificial Analysis run) | 84.5% | Not measured | Only Qwen3.5-35B-A3B measured |
| Humanity's Last Exam (Artificial Analysis run) | 21.0% | 46.5% | Step 5 Preview |
| GPQA Diamond (Epoch AI run) | 83.5% | Not measured | Only Qwen3.5-35B-A3B measured |
| LMArena Text: hard prompts | 1400 | 1461 | Step 5 Preview |
| LMArena Text: expert | 1408 | 1485 | Step 5 Preview |
| LMArena Text: hard prompts in English | 1411 | 1454 | Step 5 Preview |
| LMArena Vision: diagrams | Not measured | 1308 | Only Step 5 Preview measured |
| LMArena Vision: homework | Not measured | 1265 | Only Step 5 Preview measured |
| Neither model has a result on the other 12 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| OTIS Mock AIME | 70.0% | Not measured | Only Qwen3.5-35B-A3B measured |
| ProofBench | Not measured | 42.0% | Only Step 5 Preview measured |
| LMArena Text: math | 1404 | 1458 | Step 5 Preview |
| LMArena Text: mathematical work | 1410 | 1460 | Step 5 Preview |
| Neither model has a result on the other 9 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| LMArena Text: science | 1413 | 1454 | Step 5 Preview |
| LMArena Text: medicine and healthcare | 1421 | 1439 | Step 5 Preview |
| LMArena Text: legal and government | 1399 | 1437 | Step 5 Preview |
| LMArena Text: business and finance | 1394 | 1435 | Step 5 Preview |
| Neither model has a result on the other 14 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench design | Not measured | 76.9% | Only Step 5 Preview measured |
| Neither model has a result on the other 8 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index015
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | Leader |
|---|---|---|---|
| LiveBench data analysis | Not measured | 63.5% | Only Step 5 Preview measured |
| Public Benefits Bench (Vals AI) | Not measured | 58.1% | Only Step 5 Preview measured |
| IFBench | 72.5% | Not measured | Only Qwen3.5-35B-A3B measured |
| Long context reasoning (AA-LCR) | 72.0% | 88.3% | Step 5 Preview |
| DTBench | 80.0% | Not measured | Only Qwen3.5-35B-A3B measured |
| LMCA | 29.5% | Not measured | Only Qwen3.5-35B-A3B measured |
| LMArena Text | 1395 | 1440 | Step 5 Preview |
| LMArena Text: instruction following | 1379 | 1438 | Step 5 Preview |
| LMArena Text: creative writing | 1347 | 1409 | Step 5 Preview |
| LMArena Vision | Not measured | 1265 | Only Step 5 Preview measured |
| LMArena Text: English | 1407 | 1447 | Step 5 Preview |
| LMArena Text: non-English | 1378 | 1428 | Step 5 Preview |
| LMArena Text: Chinese | 1457 | 1500 | Step 5 Preview |
| LMArena Text: German | 1367 | Not measured | Only Qwen3.5-35B-A3B measured |
| LMArena Text: Japanese | 1326 | 1383 | Step 5 Preview |
| LMArena Text: Korean | 1355 | Not measured | Only Qwen3.5-35B-A3B measured |
| LMArena Text: French | 1412 | 1438 | Step 5 Preview |
| LMArena Text: Spanish | 1390 | 1441 | Step 5 Preview |
| LMArena Text: Russian | 1376 | 1433 | Step 5 Preview |
| LMArena Text: Polish | 1385 | Not measured | Only Qwen3.5-35B-A3B measured |
| LMArena Text: multi-turn | 1390 | 1437 | Step 5 Preview |
| LMArena Text: longer queries | 1389 | 1449 | Step 5 Preview |
| LMArena Text: writing and language | 1365 | 1425 | Step 5 Preview |
| LMArena Text: entertainment and media | 1347 | 1412 | Step 5 Preview |
| LMArena Vision: English | Not measured | 1290 | Only Step 5 Preview measured |
| LMArena Vision: reading text | Not measured | 1282 | Only Step 5 Preview measured |
| Neither model has a result on the other 20 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Qwen3.5-35B-A3B | Step 5 Preview | 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
Qwen3.5-35B-A3B costs less
Repository review
50K input + 3K output tokens
Qwen3.5-35B-A3B costs less
Agent loop
200K input + 10K output tokens
Qwen3.5-35B-A3B 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 | Qwen3.5-35B-A3B | StepFun Step 5 Preview |
|---|---|---|
| Maker | Qwen | StepFun |
| Weights | Open weights | Open weights |
| Released | February 25, 2026 | October 8, 2026 |
| Context window | 262K | 1.05M |
| Input $/Mtok | $0.1625 | $1.00 |
| Output $/Mtok | $1.30 | $2.70 |
| Coding index | Not benchmarked | 61.1 |
| Independent measurements behind it | 1 | 4 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Qwen3.5-35B-A3B better than Step 5 Preview for coding?
Only Step 5 Preview has a coding score, 61.1 on the Vibe Coding Index; Qwen3.5-35B-A3B has none, so the two cannot be ranked on coding. Pick Qwen3.5-35B-A3B for output tokens 2.1x cheaper ($1.30 vs $2.70 per million).
Which is cheaper, Qwen3.5-35B-A3B or Step 5 Preview?
Qwen3.5-35B-A3B costs $0.1625 per million input tokens and $1.30 per million output tokens; Step 5 Preview costs $1.00 and $2.70. Cost per solved task is known for neither of them.
Which has the bigger context window, Qwen3.5-35B-A3B or Step 5 Preview?
Step 5 Preview, with 1.05M tokens against 262K.
How many benchmarks is the Qwen3.5-35B-A3B vs Step 5 Preview comparison based on?
31 benchmarks have a result for both models as of October 22, 2026. Qwen3.5-35B-A3B's coding index rests on 1 independent benchmark and Step 5 Preview's on 4. Where only one model has a result, the page says so instead of naming a winner.