Gemini 2.5 Flash API Pricing: Cost Calculator & Real Examples (2026)
Gemini 2.5 Flash charges $0.30 per 1 million input tokens and $2.50 per 1 million output tokens. But per-token prices don't answer the real question: what will your workload cost per month? Below we compute it for three realistic scenarios — or run your own numbers with Gemini 2.5 Flash preselected.
| Meter | Price per 1M tokens |
|---|---|
| Input | $0.30 |
| Cached input | $0.03 |
| Output | $2.50 |
Note: Text/image/video input rate; audio input costs more.
What does Gemini 2.5 Flash cost in practice?
| Monthly scenario | Token bill |
|---|---|
| Support chatbot (150k requests, 400 in / 300 out tokens) | $130.50 |
| Document workflow (22k runs, 3,000 in / 400 out tokens) | $41.80 |
| High-volume classifier (1M requests, 300 in / 10 out tokens) | $115.00 |
In the chatbot scenario, output is ~86% of the Gemini 2.5 Flash bill — capping response length (max tokens) is the most direct optimization. Document workflows are input-heavy, so the input rate dominates there.
Prompt caching savings
Gemini 2.5 Flash offers cached input at $0.03/1M (vs $0.30 standard). At a 60% cache-hit rate, the example chatbot drops from $130.50 to $120.78/month — saving $9.72. If your system prompt and context are stable, this discount is free money.
Is Gemini 2.5 Flash cheap or expensive?
On the same chatbot workload, Gemini 2.5 Flash is cheaper than 8 of the 11 models we track (position 4 of 12, cheapest to priciest). The nearest cheaper alternative is GPT-5.6 Luna ($66.00/month on the same scenario). One step up: Claude Haiku 4.5 ($285.00/month). The right decision isn't absolute price but the cheapest model that meets your quality bar — test before overpaying.
FAQ
How much does Gemini 2.5 Flash cost per 1M tokens?
$0.30 per 1M input tokens and $2.50 per 1M output tokens (verified 2026-09-17).
What does a chatbot cost on Gemini 2.5 Flash?
A 500-active-user chatbot (10 questions/day, 400 input + 300 output tokens per request) costs ~$130.50/month in tokens on Gemini 2.5 Flash. Adjust the assumptions in the calculator.
Our take on this model
Gemini 2.5 Flash is Google's high-volume workhorse and often the cheapest way to process millions of small requests with respectable quality. Multimodal input at this price point is its unique card — image-heavy pipelines rarely find a cheaper competent option.
Watch the output side: Flash is priced for workloads that read a lot and write a little. Generation-heavy tasks shift the math toward its rivals.
Prices verified on 2026-09-17 against the provider's official pricing page. Estimates are for planning purposes only — always confirm current pricing with the provider.