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AI providers bill per million tokens, a unit that appears on no invoice. This calculator turns tokens into money for your specific case, applying each provider's rules: separate rates for input, output and cache, batch discounts, and long-context surcharges.
Prices manually verified on 2026-09-28.
Quick example
1,050,000-token context · max 128,000 output · knowledge cutoff 2026-04-30
1,200
0
400
Cost of one run
€0.028
= $0.03 · 1,600 tokens in total
Monthly cost (1,000 runs)
€28.0431
$32.00
With $100.00 per month
3,125
runs per month
Price source
OpenAI — Pricing (API)Verified: 2026-09-28
Exchange rate applied: 1 $ = 0.8763 € (Banco Central Europeo, referencia del 23/09/2026, 2026-09-23)
Every price comes from each provider's official documentation, never from an estimate or a news article. Each figure carries its own check date. When a provider changes a rate, the number is out of date until we re-check it, which is why the date sits next to it.
The exchange rate we use is the European Central Bank reference of 23/09/2026: €1 = $1.1411. We show it because applying a rate without saying so hides an editorial decision inside an arithmetic step.