Claude Sonnet 4.5 vs GPT-5.3-Codex
| Claude Sonnet 4.5 | GPT-5.3-Codex | |
|---|---|---|
| Coding index | 39.5 | 60.0 |
| Benchmarks behind it | Verified, 3 benchmarks | Verified, 3 benchmarks |
| Output $/Mtok | $15.00 | $14.00 |
| Cost per solved task | $1.16 | $0.59 |
| Context window | 1M | 400K |
| Claude Sonnet 4.5 | GPT-5.3-Codex | |
|---|---|---|
| Coding index | 39.5 | 60.0 |
| Benchmarks behind it | Verified, 3 benchmarks | Verified, 3 benchmarks |
| Output $/Mtok | $15.00 | $14.00 |
| Cost per solved task | $1.16 | $0.59 |
| Context window | 1M | 400K |