Model comparison
GPT-5.1-Codex vs Qwen3-Coder 480B-A35B Instruct
GPT-5.1-Codex and Qwen3-Coder 480B-A35B Instruct score almost the same on the Noometry Index (38.6 vs 38.1), 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. GPT-5.1-Codex scores higher in 2 categories and Qwen3-Coder 480B-A35B Instruct in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.1-Codex leads 38.0 to 23.9.
- The biggest single-benchmark swing is Terminal-Bench: 60.4% for GPT-5.1-Codex and 27.2% for Qwen3-Coder 480B-A35B Instruct.
- Qwen3-Coder 480B-A35B Instruct is cheaper at $1.50 / $7.50 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 262K.
- Qwen3-Coder 480B-A35B Instruct has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.6 | 38.1 |
| Released | 2025-11-12 | 2025-04 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 66K |
| Input $ / M tokens | $1.25 | $1.50 |
| Output $ / M tokens | $10 | $7.50 |
| Results tracked | 6 | 25 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Qwen3-Coder 480B-A35B Instruct: 35.5 (#223)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | 55.4% |
| LMArena WebDev | 1337 | 1275 |
| ALE-Bench | 1,245 | 461.45 |
| GSO | — | 4.9% |
| WeirdML | — | 41.2% |
| LMArena Coding | — | 1412 |
| AlgoTune | — | 1.44 |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 38.0 (#33), Qwen3-Coder 480B-A35B Instruct: 23.9 (#123)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| Terminal-Bench | 60.4% | 27.2% |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Qwen3-Coder 480B-A35B Instruct: 25.5 (#149)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| Kagi LLM Benchmark | — | 49.5% |
| LMArena Hard Prompts | — | 1372 |
Math Qwen3-Coder 480B-A35B Instruct leads
GPT-5.1-Codex: 30.3 (#235), Qwen3-Coder 480B-A35B Instruct: 37.6 (#150)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1365 |
Knowledge Not comparable
GPT-5.1-Codex: —, Qwen3-Coder 480B-A35B Instruct: 37.0 (#162)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| LMArena Expert | — | 1338 |
Multilingual Not comparable
GPT-5.1-Codex: —, Qwen3-Coder 480B-A35B Instruct: 47.7 (#148)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| LMArena Non-English | — | 1346 |
| LMArena Chinese | — | 1357 |
| LMArena French | — | 1398 |
| LMArena German | — | 1325 |
| LMArena Japanese | — | 1310 |
| LMArena Korean | — | 1305 |
| LMArena Russian | — | 1366 |
| LMArena Spanish | — | 1360 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Qwen3-Coder 480B-A35B Instruct: 71.6 (#147)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| LMArena Instruction Following | — | 1355 |
Long Context Not comparable
GPT-5.1-Codex: —, Qwen3-Coder 480B-A35B Instruct: 42.0 (#131)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| LMArena Longer Query | — | 1378 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Qwen3-Coder 480B-A35B Instruct: 55.3 (#147)
| Benchmark | GPT-5.1-Codex | Qwen3-Coder 480B-A35B Instruct |
|---|---|---|
| LMArena Text | — | 1357 |
| LMArena Creative Writing | — | 1333 |
| LMArena Multi-Turn | — | 1365 |
Frequently asked questions
Is GPT-5.1-Codex better than Qwen3-Coder 480B-A35B Instruct?
GPT-5.1-Codex and Qwen3-Coder 480B-A35B Instruct score almost the same on the Noometry Index (38.6 vs 38.1), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.1-Codex or Qwen3-Coder 480B-A35B Instruct?
Qwen3-Coder 480B-A35B Instruct is cheaper. It lists at $1.50 per million input tokens and $7.50 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Qwen3-Coder 480B-A35B Instruct better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 35.5 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 262K.
How many benchmarks do GPT-5.1-Codex and Qwen3-Coder 480B-A35B Instruct share?
4 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3-Coder 480B-A35B Instruct has 25.