Model comparison
GPT-5.1-Codex vs Qwen1.5 4b Chat
GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 28.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)Summary
- The widest gap is in coding, where GPT-5.1-Codex leads 41.7 to 28.6.
- Qwen1.5 4b Chat has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Qwen1.5 4b Chat | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.2 | 28.3 |
| Released | 2025-11-12 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 6 | 13 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.7 (#107), Qwen1.5 4b Chat: 28.6 (#305)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 999 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 37.8 (#32), Qwen1.5 4b Chat: —
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Qwen1.5 4b Chat: 17.7 (#277)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Hard Prompts | — | 976 |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 29.3 (#218), Qwen1.5 4b Chat: 27.9 (#233)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1026 |
Knowledge Not comparable
GPT-5.1-Codex: —, Qwen1.5 4b Chat: 26.2 (#252)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Expert | — | 980 |
Multilingual Not comparable
GPT-5.1-Codex: —, Qwen1.5 4b Chat: 24.2 (#285)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Non-English | — | 979 |
| LMArena Chinese | — | 1024 |
| LMArena German | — | 902 |
| LMArena Russian | — | 952 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Qwen1.5 4b Chat: 49.3 (#295)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Instruction Following | — | 979 |
Long Context Not comparable
GPT-5.1-Codex: —, Qwen1.5 4b Chat: 30.1 (#285)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Longer Query | — | 988 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Qwen1.5 4b Chat: 23.9 (#304)
| Benchmark | GPT-5.1-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Text | — | 997 |
| LMArena Creative Writing | — | 969 |
| LMArena Multi-Turn | — | 977 |
Frequently asked questions
Is GPT-5.1-Codex better than Qwen1.5 4b Chat?
GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 28.3 on the Noometry Index.
Is GPT-5.1-Codex or Qwen1.5 4b Chat better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 28.6 in the Noometry coding category.
How many benchmarks do GPT-5.1-Codex and Qwen1.5 4b Chat share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen1.5 4b Chat has 13.