GPT-5.4 vs Claude Opus 5.5
30-second takeaway
- GPT-5.4 has the cheaper input: $2.5 vs $4 (per 1M tokens, 38% less)
- GPT-5.4 has the larger context: 1.05M vs 1M tokens
| GPT-5.4 OpenAI | Claude Opus 5.5 AI/ML API | |
|---|---|---|
| Input | $2.5 | $4 |
| Output | $15 | $20 |
| Context | 1.05M | 1M |
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.