Calculator
GPT-5.3-Codex cost calculator
Notional API-list-price cost for GPT-5.3-Codex usage — labelled, not metered subscription spend.
Estimated cost (notional)
$2.63
≈ $78.75 across 30 similar days
Notional list price. This estimates API list price. On a Codex or Gemini subscription that is a notional figure — what usage would cost at API rates, not metered spend.
How the estimate works
The calculator prices your token counts at the bundled per-token rates: cache reads at 0.1× input, cache writes at 1.25× (5-minute) or 2× (1-hour), and a premium tier above 200K/272K context. It is an estimate — your real cost depends on your exact cache-hit pattern.
Common questions
- Is this calculator accurate?
- It uses the same published per-token rates JP prices real usage at, so it is close — but it cannot know your exact cache reuse, which is the biggest swing factor.