Model comparison
o3-pro vs Qwen3.5-Flash
o3-pro and Qwen3.5-Flash score almost the same on the Noometry Index (42.9 vs 42.5), so choose on price, context window or the category you care about most.
Last verified . 4 shared benchmarks.
Alibaba (Qwen)Summary
- They share 4 benchmarks with published results for both. o3-pro scores higher in 2 categories and Qwen3.5-Flash in 3 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.2 to 42.4.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 23.3% for o3-pro and 10.5% for Qwen3.5-Flash.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $20 / $80 for o3-pro.
- Qwen3.5-Flash accepts more context: 1M tokens versus 200K.
Side by side
| o3-pro | Qwen3.5-Flash | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 42.9 | 42.5 |
| Released | 2025-06-10 | 2026-02-23 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 1M |
| Max output | 100K | 66K |
| Input $ / M tokens | $20 | $0.10 |
| Output $ / M tokens | $80 | $0.40 |
| Results tracked | 12 | 32 |
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Category by category
Coding o3-pro leads
o3-pro: 55.5 (#24), Qwen3.5-Flash: 34.2 (#242)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| Aider Polyglot | 84.9% | — |
| LMArena WebDev | — | 1244 |
| WeirdML | 58.2% | — |
| LMArena Coding | — | 1412 |
| ALE-Bench | — | 221.8 |
Agentic & Tool Use Not comparable
o3-pro: —, Qwen3.5-Flash: —
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |
Reasoning Qwen3.5-Flash leads
o3-pro: 23.8 (#171), Qwen3.5-Flash: 33.7 (#72)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| DTBench | 86.9% | 82.9% |
| LMCA | 38.5% | 29.1% |
| Epoch Capabilities Index | 147.42 | 143.98 |
| ARC-AGI-2 | 4.9% | — |
| Kagi LLM Benchmark | 72.1% | — |
| ARC-AGI-1 | 59.3% | — |
| Chess Puzzles | — | 21% |
| LMArena Hard Prompts | — | 1403 |
| Mystery Game Puzzles | — | 20% |
Math Not comparable
o3-pro: —, Qwen3.5-Flash: 37.4 (#158)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 18.2% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| LMArena Math | — | 1407 |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Qwen3.5-Flash leads
o3-pro: 29.5 (#238), Qwen3.5-Flash: 43.2 (#93)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| Vectara Hallucination Rate | 23.3% | 10.5% |
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Confabulations | 14.2% | — |
| LMArena Expert | — | 1407 |
Multilingual Not comparable
o3-pro: —, Qwen3.5-Flash: 50.5 (#121)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | — | 1385 |
| LMArena Chinese | — | 1446 |
| LMArena French | — | 1412 |
| LMArena German | — | 1390 |
| LMArena Japanese | — | 1368 |
| LMArena Korean | — | 1344 |
| LMArena Russian | — | 1379 |
| LMArena Spanish | — | 1400 |
Instruction Following Not comparable
o3-pro: —, Qwen3.5-Flash: 72.6 (#139)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1374 |
Long Context o3-pro leads
o3-pro: 72.2 (#1), Qwen3.5-Flash: 42.4 (#124)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| Fiction.LiveBench | 97.2% | — |
| LMArena Longer Query | — | 1392 |
Writing & Preference Too close to call
o3-pro: 57.1 (#133), Qwen3.5-Flash: 57.9 (#122)
| Benchmark | o3-pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | — | 1397 |
| LMArena Creative Writing | — | 1343 |
| Short-Story Creative Writing | 84.4% | — |
| LMArena Multi-Turn | — | 1393 |
Frequently asked questions
Is o3-pro better than Qwen3.5-Flash?
o3-pro and Qwen3.5-Flash score almost the same on the Noometry Index (42.9 vs 42.5), so choose on price, context window or the category you care about most.
Which is cheaper, o3-pro or Qwen3.5-Flash?
Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; o3-pro lists at $20 and $80.
Is o3-pro or Qwen3.5-Flash better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 34.2 in the Noometry coding category.
Which has the bigger context window?
Qwen3.5-Flash does, with 1M tokens against 200K.
How many benchmarks do o3-pro and Qwen3.5-Flash share?
4 benchmarks have published results for both models. o3-pro has 12 scored results on Noometry and Qwen3.5-Flash has 32.