GPT-5.1 Codex vs o3
o3 is cheaper on output tokens, while GPT-5.1 Codex offers a larger context window. Choose GPT-5.1 Codex or o3 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.1 Codex | o3 |
|---|---|---|
| Provider | Abacus | Abacus |
| Input / 1M tokens | $1.25 | $2.00 |
| Output / 1M tokens | $10.00 | $8.00 |
| Context window | 400K | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2025 | Apr 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.