GPT-5.3-Codex vs GPT-5 Codex
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.3-Codex has the higher intelligence index (91.5 vs 87.1)
- •GPT-5 Codex is cheaper ($1.25 vs $1.75 per 1M input)
- •GPT-5 Codex is faster
| GPT-5.3-Codex | GPT-5 Codex | |
|---|---|---|
| Intelligence index | 91.5 | 87.1 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 400,000 tokens |
| Input price | $1.75 / 1M | $1.25 / 1M |
| Output price | $14.00 / 1M | $10.00 / 1M |
| Speed | 73 tok/s | 180 tok/s |
| Released | February 24, 2026 | September 23, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.3-Codex
GPT-5 Codex
GPQA Diamond
91.5
83.7
Humanity’s Last Exam
39.9
25.6