GPT-5.3 Codex vs o1-pro: Specs & Benchmark Comparison
| Characteristic | GPT-5.3 Codex | o1-pro |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | February 5, 2026 | December 17, 2024 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 400K | — |
| Context (output) | 128K | — |
| Input Price / 1M | $1.75 | — |
| Output Price / 1M | $14.00 | — |
| Average Score | 0.7 | 0.8 |
Verdict
GPT-5.3 Codex leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.3 Codex — 0.7, o1-pro — 0.8.
Recency
GPT-5.3 Codex is newer: released 2/5/2026 vs 12/17/2024.
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Frequently Asked Questions
Which is better for coding — GPT-5.3 Codex or o1-pro?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.3 Codex or o1-pro?
API pricing data is available on the individual model pages.
Which has a larger context window — GPT-5.3 Codex or o1-pro?
Context window data is available on the individual model pages.
The GPT-5.3 Codex and o1-pro comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.3 Codex or o1-pro page. See also the complete list of AI model comparisons.