Model comparison
GPT-5.1-Codex vs Qwen3.5 Max Preview
Qwen3.5 Max Preview is the stronger model overall, scoring 45.3 to 38.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)Summary
- The widest gap is in math, where Qwen3.5 Max Preview leads 40.1 to 30.3.
Side by side
| GPT-5.1-Codex | Qwen3.5 Max Preview | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.6 | 45.3 |
| Released | 2025-11-12 | — |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 6 | 17 |
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Category by category
Coding Qwen3.5 Max Preview leads
GPT-5.1-Codex: 41.9 (#116), Qwen3.5 Max Preview: 44.0 (#77)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1487 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Qwen3.5 Max Preview: —
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Qwen3.5 Max Preview: 30.8 (#84)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Hard Prompts | — | 1483 |
Math Qwen3.5 Max Preview leads
GPT-5.1-Codex: 30.3 (#235), Qwen3.5 Max Preview: 40.1 (#94)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1474 |
Knowledge Not comparable
GPT-5.1-Codex: —, Qwen3.5 Max Preview: 41.8 (#107)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Expert | — | 1489 |
Multilingual Not comparable
GPT-5.1-Codex: —, Qwen3.5 Max Preview: 56.2 (#22)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Non-English | — | 1465 |
| LMArena Chinese | — | 1534 |
| LMArena French | — | 1484 |
| LMArena German | — | 1487 |
| LMArena Japanese | — | 1495 |
| LMArena Korean | — | 1438 |
| LMArena Russian | — | 1471 |
| LMArena Spanish | — | 1470 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Qwen3.5 Max Preview: 77.0 (#31)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Instruction Following | — | 1467 |
Long Context Not comparable
GPT-5.1-Codex: —, Qwen3.5 Max Preview: 45.2 (#45)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Longer Query | — | 1476 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Qwen3.5 Max Preview: 66.0 (#41)
| Benchmark | GPT-5.1-Codex | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Text | — | 1470 |
| LMArena Creative Writing | — | 1464 |
| LMArena Multi-Turn | — | 1478 |
Frequently asked questions
Is GPT-5.1-Codex better than Qwen3.5 Max Preview?
Qwen3.5 Max Preview is the stronger model overall, scoring 45.3 to 38.6 on the Noometry Index.
Is GPT-5.1-Codex or Qwen3.5 Max Preview better for coding?
Qwen3.5 Max Preview scores higher on coding benchmarks: 44.0 versus 41.9 in the Noometry coding category.
How many benchmarks do GPT-5.1-Codex and Qwen3.5 Max Preview share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3.5 Max Preview has 17.