GPT-4o vs Claude Opus 5.5
30-second takeaway
- GPT-4o has the cheaper input: $2.5 vs $4 (per 1M tokens, 38% less)
- Claude Opus 5.5 has the larger context: 1M vs 128K tokens
| GPT-4o OpenAI | Claude Opus 5.5 AI/ML API | |
|---|---|---|
| Input | $2.5 | $4 |
| Output | $10 | $20 |
| Context | 128K | 1M |
More specs (max output / capabilities)
| max output | 16,384 | 128,000 |
| Reasoning | — No | ✓ 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.