Calculator
Codex notional cost calculator
What your Codex usage would cost at API list prices — a notional figure, not real spend.
Estimated cost (notional)
$12.00
≈ $360.00 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 the token counts you enter — input, output, cache reads, and 5-minute cache writes — at each model's own published rates from JP the Cat's bundled pricing table. Cache-read discounts differ by model: 0.1× input for most, 0.05× on Claude Opus 5.5, and 0.025× on Claude Fable 5.1. Session totals are priced at base rates because the long-context surcharge is decided per request; use the 200K context surcharge calculator for one large turn. 1-hour cache writes cost more and are not modeled here.
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.
Track your real cost with JP the Cat
A live menu-bar total, priced to the cent from your local logs — including the cache-write split most tools miss.
Download MeowPrefer Homebrew? Install the same signed, notarized app from JP's public tap.
brew tap 8bittts/jpthecat
brew trust 8bittts/jpthecat
brew install --cask jpthecat