GPT-4o vs Claude Sonnet 4.5 (latest)
30-second takeaway
- GPT-4o has the cheaper input: $2.5 vs $3 (per 1M tokens, 17% less)
- Claude Sonnet 4.5 (latest) has the larger context: 200K vs 128K tokens
| GPT-4o OpenAI | Claude Sonnet 4.5 (latest) Anthropic | |
|---|---|---|
| Input | $2.5 | $3 |
| Output | $10 | $15 |
| Context | 128K | 200K |
More specs (max output / capabilities)
| max output | 16,384 | 64,000 |
| 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.