Gemini vs OpenAI cost calculator
Google’s Gemini and OpenAI’s GPT models cover similar capability tiers at very different prices. This calculator maps Gemini Flash and Pro against GPT-4o mini, GPT-4o, and o1 for your exact token profile, so you can see the cost gap for your workload before you pick a provider.
How it works
You enter the prompt and completion tokens for a typical request and pick
a model pair. Each model is priced as (prompt ÷ 1M × input price) + (completion ÷ 1M × output price), multiplied by your daily volume. The same
inputs feed both sides, so the only thing that varies is the published rate.
The output shows per-request and daily cost for each model, the cheaper option, and the gap as both a percentage and a dollar figure — the number that actually moves your monthly bill.
Tips and notes
- Flash is built for volume. Gemini Flash often undercuts GPT-4o mini meaningfully, which matters most on high-throughput, cost-sensitive workloads.
- Reasoning tiers do not map cleanly. o1-class reasoning models are priced well above standard chat models and have no exact Gemini equivalent — compare on task quality, not just price.
- Prices are editable estimates. Google and OpenAI revise rates regularly; confirm current pricing in each console before budgeting.