DeepSeek V4 Flash vs Gemini 3.5 Flash: token pricing & cost compared (July 2026)

How DeepSeek V4 Flash (DeepSeek) and Gemini 3.5 Flash (Google) actually compare on price — input, output, and total monthly cost at the MAU you care about. Updated against live OpenRouter pricing.

DeepSeek

DeepSeek V4 Flash

Input: $0.09 / 1M tokens
Output: $0.18 / 1M tokens
Output / Input ratio: 2.0×
Context window: 1,048.576K

Google

Gemini 3.5 Flash

Input: $1.50 / 1M tokens
Output: $9.00 / 1M tokens
Output / Input ratio: 6.0×
Context window: 1,048.576K

The short answer

DeepSeek V4 Flash is cheaper across the board for typical workloads.

Token pricing side-by-side

DeepSeek V4 Flash
Gemini 3.5 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

DeepSeek V4 Flash

Per call

$0.00014

Per user / mo

$0.0135

Total / mo

$14

Gemini 3.5 Flash

Per call

$0.00525

Per user / mo

$0.5250

Total / mo

$525

DeepSeek V4 Flash is cheaper by $0.5115/user/month — a saving of $511/month at 1,000 MAU.

Total monthly bill across MAU

DeepSeek V4 Flash
Gemini 3.5 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

Gemini 3.5 Flash vs GPT-4o mini Gemini 3.5 Flash vs Claude Haiku 4.5 DeepSeek V4 Flash vs GPT-4o mini DeepSeek V4 Pro vs DeepSeek V4 Flash Gemini 3.5 Flash vs Gemini 2.5 Flash

Comparing DeepSeek V4 Flash vs Gemini 3.5 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.