GPT-5 Codex vs Qwen3.5-27B
OpenAI vs Alibaba — benchmarks, pricing, and capabilities side by side.
- •GPT-5 Codex has the higher intelligence index (87.1 vs 85.8)
- •Qwen3.5-27B is cheaper ($0.20 vs $1.25 per 1M input)
- •GPT-5 Codex is faster
- •GPT-5 Codex has a larger context window (400K)
| GPT-5 Codex | Qwen3.5-27B | |
|---|---|---|
| Intelligence index | 87.1 | 85.8 |
| Developer | OpenAI | Alibaba |
| Type | Multimodal | Multimodal |
| Access | API only | Open weights |
| Context window | 400,000 tokens | 262,144 tokens |
| Input price | $1.25 / 1M | $0.20 / 1M |
| Output price | $10.00 / 1M | $1.56 / 1M |
| Speed | 180 tok/s | 91 tok/s |
| Released | September 23, 2025 | February 25, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image, Video |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5 Codex
Qwen3.5-27B
GPQA Diamond
83.7
85.8
Humanity’s Last Exam
25.6
22.2