GPT-5.5 Pro vs GPT-5.4
30-second takeaway
- GPT-5.4 has the cheaper input: $2.5 vs $30 (per 1M tokens, 92% less)
- Same context window (1.05M tokens)
| GPT-5.5 Pro OpenAI | GPT-5.4 OpenAI | |
|---|---|---|
| Input | $30 | $2.5 |
| Output | $180 | $15 |
| Context | 1.05M | 1.05M |
More specs (max output / capabilities)
| max output | 128,000 | 128,000 |
| Reasoning | ✓ Yes | ✓ Yes |
| Tool calls | ✓ Yes | ✓ Yes |
| Open weights | — No | — No |
Prices are official/data-source rates (per 1M tokens), not what relays actually charge — relay prices vary with discounts and group multipliers. See methodology.