# GPT-5-Codex vs Qwen3.5 Plus

> Qwen3.5 Plus is the stronger model overall, scoring 42.3 to 37.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-qwen3-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- Qwen3.5 Plus accepts more context: 1M tokens versus 400K.

## Snapshot

| | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 37.3 | 42.3 |
| Rank | 190 | 103 |
| Context | 400K | 1M |
| Input $/M | $1.25 | $0.40 |
| Output $/M | $10 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5-Codex: 41.9 (#100)
- Qwen3.5 Plus: —

| Benchmark | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| WeirdML | 54.5% | — |
| ALE-Bench | — | 621.92 |

## Agentic & Tool Use

- GPT-5-Codex: 30.8 (#66)
- Qwen3.5 Plus: —

| Benchmark | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| Terminal-Bench | 44.3% | — |
| Vending-Bench 2 | — | 0.54 |

## Reasoning

- GPT-5-Codex: 30.0 (#80)
- Qwen3.5 Plus: 32.0 (#67)

| Benchmark | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| Chess Puzzles | — | 22% |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.79 |

## Math

- GPT-5-Codex: —
- Qwen3.5 Plus: 47.9 (#55)

| Benchmark | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- GPT-5-Codex: —
- Qwen3.5 Plus: 46.0 (#78)

| Benchmark | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |

## Long Context

- GPT-5-Codex: —
- Qwen3.5 Plus: 42.9 (#109)

| Benchmark | GPT-5-Codex | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |

## FAQ

### Is GPT-5-Codex better than Qwen3.5 Plus?

Qwen3.5 Plus is the stronger model overall, scoring 42.3 to 37.3 on the Noometry Index.

### Which is cheaper, GPT-5-Codex or Qwen3.5 Plus?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; GPT-5-Codex lists at $1.25 and $10.

### Which has the bigger context window?

Qwen3.5 Plus does, with 1M tokens against 400K.

### How many benchmarks do GPT-5-Codex and Qwen3.5 Plus share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Qwen3.5 Plus has 15.