GPT-5.3-Codex vs o3 Deep Research
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.3-Codex is cheaper ($1.75 vs $10.00 per 1M input)
- •GPT-5.3-Codex has a larger context window (400K)
| GPT-5.3-Codex | o3 Deep Research | |
|---|---|---|
| Intelligence index | 91.5 | — |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 200,000 tokens |
| Input price | $1.75 / 1M | $10.00 / 1M |
| Output price | $14.00 / 1M | $40.00 / 1M |
| Speed | 73 tok/s | — |
| Released | February 24, 2026 | October 10, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Image, Text |
| Output modalities | Text | Text |