# GPT-5.1-Codex-mini vs Qwen3.8 Max

> Qwen3.8 Max has enough public results to be ranked (#21); GPT-5.1-Codex-mini does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-mini-vs-qwen3-8-max
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.1-Codex-mini scores higher in 0 categories and Qwen3.8 Max in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Qwen3.8 Max leads 52.3 to 31.4.
- GPT-5.1-Codex-mini is cheaper at $0.25 / $2 per million input/output tokens, against $2 / $6 for Qwen3.8 Max.
- Qwen3.8 Max accepts more context: 1M tokens versus 400K.

## Snapshot

| | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 36.9 | 56.0 |
| Rank | — | 21 |
| Context | 400K | 1M |
| Input $/M | $0.25 | $2 |
| Output $/M | $2 | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex-mini: 31.4
- Qwen3.8 Max: 52.3 (#30)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| LMArena WebDev | 1244 | 1671 |
| DeepSWE | — | 57.5% |
| FrontierSWE | — | 15.8% |
| SciCode | — | 52.9% |
| LMArena Coding | — | 1499 |

## Agentic & Tool Use

- GPT-5.1-Codex-mini: 38.3
- Qwen3.8 Max: 42.6 (#17)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| Terminal-Bench | 61.6% | — |
| τ²-bench Banking | — | 55.1% |
| GDP.pdf | — | 23.2% |

## Reasoning

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 53.4 (#26)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| NYT Connections (extended) | — | 88.3% |
| CritPt | — | 20% |
| Chess Puzzles | — | 40% |
| LMArena Hard Prompts | — | 1493 |
| Mystery Game Puzzles | — | 38% |
| DTBench | — | 92% |
| LMCA | — | 46.2% |
| Epoch Capabilities Index | — | 156.69 |

## Math

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 73.1 (#15)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 74.7% |
| FrontierMath Tier 4 | — | 46.3% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 58% |
| LMArena Math | — | 1498 |

## Knowledge

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 61.7 (#25)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| GPQA Diamond | — | 92.7% |
| SimpleQA Verified | — | 47.3% |
| LMArena Expert | — | 1504 |

## Multimodal

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 36.9 (#70)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| LMArena Vision | — | 1314 |
| Furniture Assembly | — | 20% |

## Multilingual

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 56.6 (#18)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| LMArena Non-English | — | 1468 |
| LMArena Chinese | — | 1537 |
| LMArena French | — | 1502 |
| LMArena German | — | 1489 |
| LMArena Japanese | — | 1466 |
| LMArena Korean | — | 1467 |
| LMArena Russian | — | 1478 |
| LMArena Spanish | — | 1495 |

## Instruction Following

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 77.7 (#19)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| LMArena Instruction Following | — | 1478 |

## Long Context

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 45.5 (#30)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| LMArena Longer Query | — | 1486 |

## Writing & Preference

- GPT-5.1-Codex-mini: —
- Qwen3.8 Max: 67.0 (#31)

| Benchmark | GPT-5.1-Codex-mini | Qwen3.8 Max |
|---|---|---|
| LMArena Text | — | 1480 |
| LMArena Creative Writing | — | 1478 |
| LMArena Multi-Turn | — | 1487 |

## FAQ

### Is GPT-5.1-Codex-mini better than Qwen3.8 Max?

Qwen3.8 Max has enough public results to be ranked (#21); GPT-5.1-Codex-mini does not yet, so treat this comparison as directional.

### Which is cheaper, GPT-5.1-Codex-mini or Qwen3.8 Max?

GPT-5.1-Codex-mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; Qwen3.8 Max lists at $2 and $6.

### Is GPT-5.1-Codex-mini or Qwen3.8 Max better for coding?

Qwen3.8 Max scores higher on coding benchmarks: 52.3 versus 31.4 in the Noometry coding category.

### Which has the bigger context window?

Qwen3.8 Max does, with 1M tokens against 400K.

### How many benchmarks do GPT-5.1-Codex-mini and Qwen3.8 Max share?

1 benchmark has published results for both models. GPT-5.1-Codex-mini has 2 scored results on Noometry and Qwen3.8 Max has 38.