Google prices the Gemini API per million tokens on the paid tier, with an input rate, a cached-input rate, an output rate and a 50% batch discount. Context caching is billed as storage per hour rather than a per-token write. The table is the full current list from Google's pricing page, followed by what three real workloads cost on each model.
gemini-3.1-pro-previewgemini-3.8-flashgemini-3.5-flash-litePaid tier, text input. Context caching bills storage per hour instead of a per-token write. Batch is 50% off. Pro models bill prompts over 200k tokens at 2x input and 1.5x output. Gemini 4 Argon list price doubles on 1 December 2026; the 3.6 and 3.8 Flash introductory prices end 1 January 2027. Source: ai.google.dev →
| Model | Input | Cached input | Output | Batch | Notes |
|---|---|---|---|---|---|
Gemini 4 Argongemini-4-argon |
$2 | $0.1 | $10 | 50% off | Rises to $4 / $20 on 1 December 2026. Not on the free tier. |
Gemini 3.8 Flashgemini-3.8-flash |
$0.75 | $0.075 | $3.75 | 50% off | Introductory; $1.50 / $7.50 from 1 January 2027. |
Gemini 3.5 Flash-Litegemini-3.5-flash-lite |
$0.3 | $0.03 | $2.5 | 50% off | |
Gemini 3.1 Flash-Litegemini-3.1-flash-lite |
$0.25 | $0.025 | $1.5 | 50% off | |
Gemini 3.1 Pro Previewgemini-3.1-pro-preview |
$2 | $0.2 | $12 | 50% off | Over 200k tokens: $4 / $18. |
List prices are hard to feel per million. These are three monthly workloads, priced on the models above at the standard tier, with the batch discount applied only where the workload is asynchronous. Retries, tool-call loops and prompt growth are not in these numbers, which is why estimates and invoices disagree.
| Model | Support chatbot | Tool-using agent | Overnight classification |
|---|---|---|---|
Gemini 3.1 Pro Previewgemini-3.1-pro-preview |
$440 | $630 | $1,100 |
Gemini 4 Argongemini-4-argon |
$400 | $585 | $1,050 |
Gemini 3.8 Flashgemini-3.8-flash |
$150 | $219 | $394 |
Gemini 3.5 Flash-Litegemini-3.5-flash-lite |
$80.00 | $110 | $183 |
Take the tool-using agent above on Gemini 3.8 Flash. Its 180,000,000 input tokens a month cost $135 at the input rate. If 80% of those tokens are a repeated prefix (system prompt, tool definitions, a shared document) served from the cache at $0.075, the input line falls to $37.80, a 72% saving before output tokens. Google does not charge a per-token cache write. Instead, cached context is billed as storage per million tokens per hour while it stays warm, so the saving depends on how long you keep a prefix alive and how often you read it in that window.
Gemini 4 Argon doubles to $4 input and $20 output on 1 December 2026. The introductory $0.75 / $3.75 prices on Gemini 3.6 Flash and 3.8 Flash end on 1 January 2027, when both move to $1.50 / $7.50. Budgets built on today's rates for those models are wrong by January.
Gemini 3.1 Pro Preview and 2.5 Pro bill prompts over 200,000 tokens at 2x input and 1.5x output. The million-token context is real, but filling it is priced accordingly.
Google offers a free tier with rate limits and data used for product improvement. Every price here is the paid tier, where your prompts are not used for training. Gemini 4 Argon is not available on the free tier at all.
Asynchronous batch requests pay half on input and output across the current models, the same discount OpenAI and Anthropic offer.
Still priced because code still names them. A legacy model is available but superseded; a retired one no longer runs on this provider's API, though several remain on cloud marketplaces at the rate shown.
| Model | Input | Cached input | Output | Notes |
|---|---|---|---|---|
Gemini 3.6 Flashlegacygemini-3.6-flash |
$0.75 | $0.075 | $3.75 | Introductory; $1.50 / $7.50 from 1 January 2027. |
Gemini 3 Flash Previewlegacygemini-3-flash-preview |
$0.5 | $0.05 | $3 | |
Gemini 2.5 Prolegacygemini-2.5-pro |
$1.25 | $0.125 | $10 | Over 200k tokens: $2.50 / $15. |
Gemini 2.5 Flashlegacygemini-2.5-flash |
$0.3 | $0.03 | $2.5 | |
Gemini 2.5 Flash-Litelegacygemini-2.5-flash-lite |
$0.1 | $0.01 | $0.4 |
The same three roles on each provider, input and output per million tokens. Tier for tier is the only fair comparison; a budget model on one provider against a flagship on another tells you nothing.
Current Gemini models range from $0.3 input and $2.5 output per million tokens on Gemini 3.5 Flash-Lite to $2 input and $12 output on Gemini 3.1 Pro Preview. Gemini 3.8 Flash is $0.75 input and $3.75 output at its introductory price. Cached input is 0.1x and batch is 50% off.
There is a free tier with rate limits, and Google may use free-tier prompts to improve its products. Production use is on the paid tier, which is what this page prices. Gemini 4 Argon has no free tier.
On Gemini 3.8 Flash, a prompt that is 80% cached input costs 72% less in input tokens than the same prompt uncached ($135 against $37.80 a month on the worked agent example below), before the hourly storage charge for keeping the cache warm.
Tier for tier, Gemini has been the lowest list price of the three for most of 2026: Gemini 3.1 Pro Preview undercuts both Claude Opus 5.5 and GPT-5.5 on input, and Flash-Lite is the cheapest current model on this site. The scheduled rises on 1 December and 1 January narrow that gap; the cross-provider table on this page shows the current position.
Thinking tokens bill as output at the model's output rate. They are reported in the usage metadata of each response and need to be included in any per-call cost.
These are the rates. Agent Ping applies them to every real run your agents make, by agent, customer and feature, and pages you when one of them spikes. It prices Gemini calls from this same table.
Free plan, no card. Prices on this page verified 17 October 2026.