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Gemini vs ChatGPT Cost Calculator

Compare per-token pricing across Gemini 3 Pro, 2.5 Pro/Flash, GPT-5/mini/nano, and GPT-4o. See which model wins at your input/output mix.

Updated May 2026
Cheapest at this volume
GPT-5 nano — $10.5/mo
Model$ in / 1M$ out / 1MMonthly cost
GPT-5 nano$0.05$0.40$10.5
Gemini 2.5 Flash-Lite$0.10$0.40$13
GPT-4o mini$0.15$0.60$19.5
GPT-5 mini$0.25$2.00$52.5
Gemini 2.5 Flash$0.30$2.50$65
Gemini 2.5 Pro$1.25$5.00$162.5
Gemini 3 Pro$2.50$10.00$325
GPT-5$2.50$10.00$325
GPT-4o$2.50$10.00$325
Heads up: rates are USD per 1M tokens at standard tier; they shift quarterly. Doesn’t include caching discounts, batch API (50% off), or vision/audio surcharges — use the prompt-cache and batch-API calculators for those.
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What it does

Compare per-token API pricing across all current Gemini and OpenAI models at your real volume. Inputs are tokens-per-call (in thousands) and calls-per-month; outputs are sorted cost-by-model with the cheapest flagged. Useful for picking a model before committing, or for costing out a switch.

For a deeper look at the full frontier-model landscape, see the frontier model tracker.

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How to use it

  1. Enter input + output tokens per call (in thousands).
  2. Enter calls per month.
  3. Read the cheapest pick + full table.

See how this compares

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