Model comparison
GPT-5.1-Codex vs Qwen Plus
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 37.1 on the Noometry Index. Qwen Plus costs 5.7× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)Summary
- The widest gap is in math, where GPT-5.1-Codex leads 30.3 to 23.3.
- Qwen Plus is cheaper at $0.40 / $1.20 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- Qwen Plus accepts more context: 1M tokens versus 400K.
Side by side
| GPT-5.1-Codex | Qwen Plus | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.6 | 37.1 |
| Released | 2025-11-12 | 2024-01-25 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1M |
| Max output | 128K | 33K |
| Input $ / M tokens | $1.25 | $0.40 |
| Output $ / M tokens | $10 | $1.20 |
| Results tracked | 6 | 20 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Qwen Plus: 38.9 (#167)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1328 |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 38.0 (#33), Qwen Plus: —
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Qwen Plus: 28.4 (#107)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| Kagi LLM Benchmark | — | 63.3% |
| LMArena Hard Prompts | — | 1317 |
| DTBench | — | 81.1% |
| LMCA | — | 24% |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 30.3 (#235), Qwen Plus: 23.3 (#271)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 17.8% |
| ProofBench | 9% | — |
| LMArena Math | — | 1326 |
| MATH Level 5 | — | 65.3% |
| FrontierMath (Feb 2025 set) | — | 1.7% |
Knowledge Not comparable
GPT-5.1-Codex: —, Qwen Plus: 27.4 (#251)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| GPQA Diamond | — | 48.1% |
| LMArena Expert | — | 1328 |
Multilingual Not comparable
GPT-5.1-Codex: —, Qwen Plus: 45.1 (#175)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| LMArena Non-English | — | 1310 |
| LMArena Chinese | — | 1347 |
| LMArena Japanese | — | 1251 |
| LMArena Russian | — | 1323 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Qwen Plus: 68.8 (#181)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| LMArena Instruction Following | — | 1303 |
Long Context Not comparable
GPT-5.1-Codex: —, Qwen Plus: 40.3 (#158)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| LMArena Longer Query | — | 1324 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Qwen Plus: 52.2 (#176)
| Benchmark | GPT-5.1-Codex | Qwen Plus |
|---|---|---|
| LMArena Text | — | 1326 |
| LMArena Creative Writing | — | 1293 |
| LMArena Multi-Turn | — | 1336 |
Frequently asked questions
Is GPT-5.1-Codex better than Qwen Plus?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 37.1 on the Noometry Index. Qwen Plus costs 5.7× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.
Which is cheaper, GPT-5.1-Codex or Qwen Plus?
Qwen Plus is cheaper. It lists at $0.40 per million input tokens and $1.20 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Qwen Plus better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 38.9 in the Noometry coding category.
Which has the bigger context window?
Qwen Plus does, with 1M tokens against 400K.
How many benchmarks do GPT-5.1-Codex and Qwen Plus share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen Plus has 20.