OpenAI: o3 vs OpenAI: GPT-5.3 Chat
Side-by-side model comparison based on OpenRouter API data.
| Spec | OpenAI: o3 | OpenAI: GPT-5.3 Chat |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Context Length | 200K | 128K |
| Max Output | 100K | 16K |
| Input Price/1M | $2.00 | $1.75 |
| Output Price/1M | $8.00 | $14 |
| Cache Read/1M | $0.50 | $0.17 |
| Cache Write/1M | Free | Free |
| Input Modalities | Image + Text + File | Text + Image + File |
| Output Modalities | Text | Text |
| Tokenizer | GPT | GPT |
| Moderated | Yes | Yes |