Model comparison
GPT-5-Codex vs Qwen1.5 4b Chat
GPT-5-Codex is the stronger model overall, scoring 37.9 to 28.8 on the Noometry Index.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)Summary
- The widest gap is in coding, where GPT-5-Codex leads 42.4 to 29.1.
- Qwen1.5 4b Chat has downloadable open weights; the other is API-only.
Side by side
| GPT-5-Codex | Qwen1.5 4b Chat | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 37.9 | 28.8 |
| Released | 2025-09-15 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 3 | 13 |
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Category by category
Coding GPT-5-Codex leads
GPT-5-Codex: 42.4 (#103), Qwen1.5 4b Chat: 29.1 (#308)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 999 |
Agentic & Tool Use Not comparable
GPT-5-Codex: 31.0 (#72), Qwen1.5 4b Chat: —
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| Terminal-Bench | 44.3% | — |
Reasoning GPT-5-Codex leads
GPT-5-Codex: 30.9 (#83), Qwen1.5 4b Chat: 18.5 (#279)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 976 |
Math Not comparable
GPT-5-Codex: —, Qwen1.5 4b Chat: 30.4 (#234)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Math | — | 1026 |
Knowledge Not comparable
GPT-5-Codex: —, Qwen1.5 4b Chat: 26.7 (#255)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Expert | — | 980 |
Multilingual Not comparable
GPT-5-Codex: —, Qwen1.5 4b Chat: 24.1 (#290)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Non-English | — | 979 |
| LMArena Chinese | — | 1024 |
| LMArena German | — | 902 |
| LMArena Russian | — | 952 |
Instruction Following Not comparable
GPT-5-Codex: —, Qwen1.5 4b Chat: 49.0 (#300)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Instruction Following | — | 978 |
Long Context Not comparable
GPT-5-Codex: —, Qwen1.5 4b Chat: 30.1 (#290)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Longer Query | — | 988 |
Writing & Preference Not comparable
GPT-5-Codex: —, Qwen1.5 4b Chat: 23.8 (#309)
| Benchmark | GPT-5-Codex | Qwen1.5 4b Chat |
|---|---|---|
| LMArena Text | — | 997 |
| LMArena Creative Writing | — | 969 |
| LMArena Multi-Turn | — | 977 |
Frequently asked questions
Is GPT-5-Codex better than Qwen1.5 4b Chat?
GPT-5-Codex is the stronger model overall, scoring 37.9 to 28.8 on the Noometry Index.
Is GPT-5-Codex or Qwen1.5 4b Chat better for coding?
GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 29.1 in the Noometry coding category.
How many benchmarks do GPT-5-Codex and Qwen1.5 4b Chat share?
0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Qwen1.5 4b Chat has 13.