Model comparison
Qwen3.5-Flash vs Step 2 16k Exp 202412
Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 39.2 on the Noometry Index.
Last verified . 12 shared benchmarks.
Alibaba (Qwen)
StepFunSummary
- They share 12 benchmarks with published results for both. Qwen3.5-Flash scores higher in 7 categories and Step 2 16k Exp 202412 in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Qwen3.5-Flash leads 43.2 to 35.2.
Side by side
| Qwen3.5-Flash | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Alibaba (Qwen) | StepFun |
| Noometry Index | 42.5 | 39.2 |
| Released | 2026-02-23 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.40 | — |
| Results tracked | 32 | 12 |
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Category by category
Coding Step 2 16k Exp 202412 leads
Qwen3.5-Flash: 34.2 (#242), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1412 | 1316 |
| LMArena WebDev | 1244 | — |
| ALE-Bench | 221.8 | — |
Agentic & Tool Use Not comparable
Qwen3.5-Flash: —, Step 2 16k Exp 202412: —
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| Vending-Bench 2 | 462.69 | — |
Reasoning Qwen3.5-Flash leads
Qwen3.5-Flash: 33.7 (#72), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1403 | 1299 |
| Chess Puzzles | 21% | — |
| Mystery Game Puzzles | 20% | — |
| DTBench | 82.9% | — |
| LMCA | 29.1% | — |
| Epoch Capabilities Index | 143.98 | — |
Math Qwen3.5-Flash leads
Qwen3.5-Flash: 37.4 (#158), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1407 | 1304 |
| FrontierMath (Tiers 1-3) | 18.2% | — |
| OTIS Mock AIME 2024-2025 | 84.4% | — |
| FrontierMath (Feb 2025 set) | 6.2% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Qwen3.5-Flash leads
Qwen3.5-Flash: 43.2 (#93), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1407 | 1279 |
| GPQA Diamond | 82.3% | — |
| SimpleQA Verified | 20.3% | — |
| Vectara Hallucination Rate | 10.5% | — |
Multilingual Qwen3.5-Flash leads
Qwen3.5-Flash: 50.5 (#121), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1385 | 1290 |
| LMArena Chinese | 1446 | 1331 |
| LMArena Russian | 1379 | 1324 |
| LMArena French | 1412 | — |
| LMArena German | 1390 | — |
| LMArena Japanese | 1368 | — |
| LMArena Korean | 1344 | — |
| LMArena Spanish | 1400 | — |
Instruction Following Qwen3.5-Flash leads
Qwen3.5-Flash: 72.6 (#139), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1374 | 1287 |
Long Context Qwen3.5-Flash leads
Qwen3.5-Flash: 42.4 (#124), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1392 | 1307 |
Writing & Preference Qwen3.5-Flash leads
Qwen3.5-Flash: 57.9 (#122), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Qwen3.5-Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1397 | 1321 |
| LMArena Creative Writing | 1343 | 1328 |
| LMArena Multi-Turn | 1393 | 1292 |
Frequently asked questions
Is Qwen3.5-Flash better than Step 2 16k Exp 202412?
Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 39.2 on the Noometry Index.
Is Qwen3.5-Flash or Step 2 16k Exp 202412 better for coding?
Step 2 16k Exp 202412 scores higher on coding benchmarks: 38.5 versus 34.2 in the Noometry coding category.
How many benchmarks do Qwen3.5-Flash and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Qwen3.5-Flash has 32 scored results on Noometry and Step 2 16k Exp 202412 has 12.