# GPT-5.1-Codex vs Qwen3.6 Flash

> GPT-5.1-Codex and Qwen3.6 Flash score almost the same on the Noometry Index (38.2 vs 38.4), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-qwen3-6-flash
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.1-Codex scores higher in 0 categories and Qwen3.6 Flash in 1 category; one gap is clear of the uncertainty.
- The widest gap is in math, where Qwen3.6 Flash leads 38.0 to 29.3.
- Qwen3.6 Flash is cheaper at $0.19 / $1.13 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- Qwen3.6 Flash accepts more context: 1M tokens versus 400K.

## Snapshot

| | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 38.2 | 38.4 |
| Rank | 178 | 176 |
| Context | 400K | 1M |
| Input $/M | $1.25 | $0.19 |
| Output $/M | $10 | $1.13 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Qwen3.6 Flash: —

| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| ALE-Bench | 1,245 | 326.4 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Qwen3.6 Flash: —

| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Qwen3.6 Flash: 28.4 (#90)

| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| SimpleBench | — | 35.2% |
| Chess Puzzles | — | 20% |
| Mystery Game Puzzles | — | 18% |
| DTBench | — | 77.1% |
| LMCA | — | 31% |
| Epoch Capabilities Index | — | 143.26 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Qwen3.6 Flash: 38.0 (#88)

| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 22.5% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| ProofBench | 9% | — |
| FrontierMath (Feb 2025 set) | — | 10.3% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- GPT-5.1-Codex: —
- Qwen3.6 Flash: 42.2 (#90)

| Benchmark | GPT-5.1-Codex | Qwen3.6 Flash |
|---|---|---|
| GPQA Diamond | — | 83.3% |
| SimpleQA Verified | — | 15.9% |

## FAQ

### Is GPT-5.1-Codex better than Qwen3.6 Flash?

GPT-5.1-Codex and Qwen3.6 Flash score almost the same on the Noometry Index (38.2 vs 38.4), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.1-Codex or Qwen3.6 Flash?

Qwen3.6 Flash is cheaper. It lists at $0.19 per million input tokens and $1.13 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Which has the bigger context window?

Qwen3.6 Flash does, with 1M tokens against 400K.

### How many benchmarks do GPT-5.1-Codex and Qwen3.6 Flash share?

1 benchmark has published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3.6 Flash has 13.