Google: Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview is a reasoning model from Google released on Mar 20, 2025. It reads text, images, files, audio and video and writes text, with a 1.05M token context window and up to 66K tokens per reply.
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It costs $0.25 per million input tokens and $1.50 per million output tokens. Cached input bills at $0.025, 90% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
10 providers serve it, including Databricks, Kilo Gateway and 302.AI. The lowest input price is $0.125 per million tokens at Kilo Gateway.
- Modalities
- In / out price
- $0.25 / $1.50 per 1M
- Context
- 1.05M
- Max output
- 66K
- Released
- Mar 20, 2025
- Knowledge cutoff
- Jan 2025
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Gemini 3.1 Flash Lite Preview pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.25 / 1M tokens | |
|---|---|---|
| Output | $1.50 / 1M tokens | |
| Cached input (read) | $0.025 / 1M tokens | 90% off input |
| Audio input | $0.50 / 1M tokens |
Gemini 3.1 Flash Lite Preview providers
10 providers serve it, including Databricks, Kilo Gateway and 302.AI. The lowest input price is $0.125 per million tokens at Kilo Gateway. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Databricks | $0.25 | $1.50 | $0.025 | 1.05M | 66K |
| Kilo Gateway | $0.125 | $0.75 | $0.0125 | 1.05M | 66K |
| 302.AI | $0.25 | $1.50 | – | 1.05M | 66K |
| Abacus | $0.25 | $1.50 | $0.025 | 1.05M | 66K |
| Eden AI | $0.25 | $1.50 | $0.025 | 1.05M | 66K |
| Merge Gateway | $0.25 | $1.50 | $0.025 | 1.05M | 66K |
| Neon | $0.25 | $1.50 | $0.025 | 1.05M | 66K |
| OrcaRouter | $0.25 | $1.50 | $0.025 | 1.05M | 66K |
| ZenMux | $0.25 | $1.50 | – | 1.05M | 66K |
| AI/ML API | $0.3439 | $2.06 | $0.0344 | 1M | 66K |
What Gemini 3.1 Flash Lite Preview costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Gemini 3.1 Flash Lite Preview through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Gemini 3.1 Flash Lite Preview questions
How much does the Gemini 3.1 Flash Lite Preview API cost?
$0.25 per million input tokens and $1.50 per million output tokens, with cached input at $0.025. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Gemini 3.1 Flash Lite Preview?
1,048,576 tokens of input, and it can write up to 65,536 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Gemini 3.1 Flash Lite Preview?
10 providers serve it, including Databricks, Kilo Gateway and 302.AI. The lowest input price is $0.125 per million tokens at Kilo Gateway. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Gemini 3.1 Flash Lite Preview support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Gemini 3.1 Flash Lite Preview open source?
No. Google serves it through an API only, so you cannot download the weights or host it yourself.
When was Gemini 3.1 Flash Lite Preview released?
Mar 20, 2025, with training data up to Jan 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on Gemini 3.1 Flash Lite Preview?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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