Model comparison
Grok 4.20 (Non-Reasoning) vs Qwen3.5-Flash
Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.6 to 42.5 on the Noometry Index. Qwen3.5-Flash costs 8.9× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.
Last verified . 28 shared benchmarks.
Alibaba (Qwen)Summary
- They share 28 benchmarks with published results for both. Grok 4.20 (Non-Reasoning) scores higher in 8 categories and Qwen3.5-Flash in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 (Non-Reasoning) leads 52.3 to 33.7.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 44.9% for Grok 4.20 (Non-Reasoning) and 18.2% for Qwen3.5-Flash.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 (Non-Reasoning).
Side by side
| Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash | |
|---|---|---|
| Provider | xAI | Alibaba (Qwen) |
| Noometry Index | 48.6 | 42.5 |
| Released | 2026-02-17 | 2026-02-23 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Max output | 30K | 66K |
| Input $ / M tokens | $1.25 | $0.10 |
| Output $ / M tokens | $2.50 | $0.40 |
| Results tracked | 46 | 32 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 42.1 (#112), Qwen3.5-Flash: 34.2 (#242)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| LMArena WebDev | 1375 | 1244 |
| LMArena Coding | 1459 | 1412 |
| ALE-Bench | 1,150 | 221.8 |
| WeirdML | 52.3% | — |
Agentic & Tool Use Not comparable
Grok 4.20 (Non-Reasoning): 34.4 (#46), Qwen3.5-Flash: —
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | 4,663 | 462.69 |
| Terminal-Bench | 57.3% | — |
| τ²-bench Banking | 18% | — |
| LMArena Search | 1189 | — |
Reasoning Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 52.3 (#32), Qwen3.5-Flash: 33.7 (#72)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| Chess Puzzles | 24% | 21% |
| LMArena Hard Prompts | 1451 | 1403 |
| DTBench | 90.1% | 82.9% |
| LMCA | 38.7% | 29.1% |
| Epoch Capabilities Index | 151.98 | 143.98 |
| ARC-AGI-2 | 65.1% | — |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | 85.4% | — |
| ARC-AGI-1 | 89.5% | — |
| Thematic Generalization | 63.8% | — |
| Mystery Game Puzzles | — | 20% |
| ForecastBench | 61.4 | — |
Math Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 48.2 (#65), Qwen3.5-Flash: 37.4 (#158)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 44.9% | 18.2% |
| OTIS Mock AIME 2024-2025 | 92.2% | 84.4% |
| LMArena Math | 1455 | 1407 |
| FrontierMath Tier 4 | 17.1% | — |
| ProofBench | 14% | — |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 52.8 (#60), Qwen3.5-Flash: 43.2 (#93)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| GPQA Diamond | 89.3% | 82.3% |
| SimpleQA Verified | 30.2% | 20.3% |
| LMArena Expert | 1439 | 1407 |
| Vectara Hallucination Rate | — | 10.5% |
Multimodal Not comparable
Grok 4.20 (Non-Reasoning): 33.3 (#98), Qwen3.5-Flash: —
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| LMArena Vision | 1263 | — |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1416 | — |
Multilingual Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 54.5 (#40), Qwen3.5-Flash: 50.5 (#121)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1441 | 1385 |
| LMArena Chinese | 1481 | 1446 |
| LMArena French | 1476 | 1412 |
| LMArena German | 1465 | 1390 |
| LMArena Japanese | 1449 | 1368 |
| LMArena Korean | 1417 | 1344 |
| LMArena Russian | 1458 | 1379 |
| LMArena Spanish | 1443 | 1400 |
Instruction Following Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 74.8 (#83), Qwen3.5-Flash: 72.6 (#139)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1420 | 1374 |
Long Context Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 45.5 (#34), Qwen3.5-Flash: 42.4 (#124)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1437 | 1392 |
| CL-bench | 22.2% | — |
| CL-bench Life | 11.9% | — |
Writing & Preference Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 65.7 (#44), Qwen3.5-Flash: 57.9 (#122)
| Benchmark | Grok 4.20 (Non-Reasoning) | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1451 | 1397 |
| LMArena Creative Writing | 1438 | 1343 |
| LMArena Multi-Turn | 1456 | 1393 |
| EQ-Bench Creative Writing | 1574 | — |
Frequently asked questions
Is Grok 4.20 (Non-Reasoning) better than Qwen3.5-Flash?
Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.6 to 42.5 on the Noometry Index. Qwen3.5-Flash costs 8.9× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.
Which is cheaper, Grok 4.20 (Non-Reasoning) 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; Grok 4.20 (Non-Reasoning) lists at $1.25 and $2.50.
Is Grok 4.20 (Non-Reasoning) or Qwen3.5-Flash better for coding?
Grok 4.20 (Non-Reasoning) scores higher on coding benchmarks: 42.1 versus 34.2 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Grok 4.20 (Non-Reasoning) and Qwen3.5-Flash share?
28 benchmarks have published results for both models. Grok 4.20 (Non-Reasoning) has 46 scored results on Noometry and Qwen3.5-Flash has 32.