# GPT-5.1-Codex vs Qwen2.5 Plus 1127

> GPT-5.1-Codex and Qwen2.5 Plus 1127 score almost the same on the Noometry Index (38.2 vs 38.1), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-qwen2-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Qwen2.5 Plus 1127 leads 33.5 to 29.3.

## Snapshot

| | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.2 | 38.1 |
| Rank | 178 | 179 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Qwen2.5 Plus 1127: 37.9 (#171)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| LMArena Coding | — | 1314 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Qwen2.5 Plus 1127: —

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Qwen2.5 Plus 1127: 24.8 (#139)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Hard Prompts | — | 1299 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Qwen2.5 Plus 1127: 33.5 (#175)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1298 |

## Knowledge

- GPT-5.1-Codex: —
- Qwen2.5 Plus 1127: 34.9 (#179)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Expert | — | 1289 |

## Multilingual

- GPT-5.1-Codex: —
- Qwen2.5 Plus 1127: 42.1 (#196)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Non-English | — | 1265 |
| LMArena Chinese | — | 1314 |
| LMArena German | — | 1231 |
| LMArena Japanese | — | 1207 |
| LMArena Russian | — | 1271 |

## Instruction Following

- GPT-5.1-Codex: —
- Qwen2.5 Plus 1127: 67.4 (#194)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Instruction Following | — | 1275 |

## Long Context

- GPT-5.1-Codex: —
- Qwen2.5 Plus 1127: 39.2 (#180)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Longer Query | — | 1292 |

## Writing & Preference

- GPT-5.1-Codex: —
- Qwen2.5 Plus 1127: 49.5 (#186)

| Benchmark | GPT-5.1-Codex | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Text | — | 1299 |
| LMArena Creative Writing | — | 1262 |
| LMArena Multi-Turn | — | 1299 |

## FAQ

### Is GPT-5.1-Codex better than Qwen2.5 Plus 1127?

GPT-5.1-Codex and Qwen2.5 Plus 1127 score almost the same on the Noometry Index (38.2 vs 38.1), so choose on price, context window or the category you care about most.

### Is GPT-5.1-Codex or Qwen2.5 Plus 1127 better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 37.9 in the Noometry coding category.

### How many benchmarks do GPT-5.1-Codex and Qwen2.5 Plus 1127 share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen2.5 Plus 1127 has 14.