GPT-4o mini vs Gemini 2.5 Flash: token pricing & cost compared (July 2026)

How GPT-4o mini (OpenAI) and Gemini 2.5 Flash (Google) actually compare on price — input, output, and total monthly cost at the MAU you care about. Updated against live OpenRouter pricing.

OpenAI

GPT-4o mini

Input: $0.15 / 1M tokens
Output: $0.60 / 1M tokens
Output / Input ratio: 4.0×
Context window: 128K

Google

Gemini 2.5 Flash

Input: $0.30 / 1M tokens
Output: $2.50 / 1M tokens
Output / Input ratio: 8.3×
Context window: 1,048.576K

The short answer

GPT-4o mini is cheaper across the board for typical workloads.

Token pricing side-by-side

GPT-4o mini
Gemini 2.5 Flash

Cost at your usage

Avg input tokens / call

Avg output tokens / call

Calls per active user / day: 5

Active days / month: 20

MAU: 1,000

GPT-4o mini

Per call

$0.00037

Per user / mo

$0.0375

Total / mo

$37

Gemini 2.5 Flash

Per call

$0.00140

Per user / mo

$0.1400

Total / mo

$140

GPT-4o mini is cheaper by $0.1025/user/month — a saving of $103/month at 1,000 MAU.

Total monthly bill across MAU

GPT-4o mini
Gemini 2.5 Flash

Same usage profile applied to both models; only the per-token price differs.

Run this against your real numbers

The mini-calculator above is a preview. Use the full tools to model power-user blast radius, gross margin, and 12-month spend forecasts.

Other comparisons

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Comparing GPT-4o mini vs Gemini 2.5 Flash on price alone never tells the whole story — output-token weighting, context length, and your usage profile change the answer dramatically. Use the calculators below for the full picture.