Comparison
Claude Sonnet 4.6 vs GPT-5.3-Codex — cost compared
Claude Sonnet 4.6 and GPT-5.3-Codex, compared on real per-million-token pricing.
| Attribute | Claude Sonnet 4.6 | GPT-5.3-Codex |
|---|---|---|
| Input / 1M | $3.00 | $1.75 |
| Output / 1M | $15.00 | $14.00 |
| Cache read / 1M | $0.30 | $0.18 |
| Cache write 1h / 1M | $6.00 | — |
Reading the comparison
All figures are USD per million tokens at API list prices. Cache-read economics often matter more than the headline input/output rates for a well-cached coding session.
Common questions
- Which is cheaper, Claude Sonnet 4.6 or GPT-5.3-Codex?
- It depends on your input/output mix and how much you cache. The table shows each rate so you can weigh your own workload.