Google: Gemini 3.1 Flash Lite Preview

google/gemini-3.1-flash-lite-preview

Released Mar 3, 20261,048,576 context

$0.25/M input tokens$1.50/M output tokens$0.50/M audio tokens

Gemini 3.1 Flash Lite Preview is Google's high-efficiency model optimized for high-volume use cases. It outperforms Gemini 2.5 Flash Lite on overall quality and approaches Gemini 2.5 Flash performance across key capabilities. Improvements span audio input/ASR, RAG snippet ranking, translation, data extraction, and code completion. Supports full thinking levels (minimal, low, medium, high) for fine-grained cost/performance trade-offs. Priced at half the cost of Gemini 3 Flash.

Providers for Gemini 3.1 Flash Lite Preview

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for Gemini 3.1 Flash Lite Preview

Compare different providers across OpenRouter

Effective Pricing for Gemini 3.1 Flash Lite Preview

Actual cost per million tokens across providers over the past hour

Apps using Gemini 3.1 Flash Lite Preview

Top public apps this month

Recent activity on Gemini 3.1 Flash Lite Preview

Total usage per day on OpenRouter

Prompt

23.1B

Completion

887M

Reasoning

354M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for Gemini 3.1 Flash Lite Preview

Uptime stats for Gemini 3.1 Flash Lite Preview across all providers

Sample code and API for Gemini 3.1 Flash Lite Preview

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

Gemini 3.1 Flash Lite Preview - API Pricing & Providers | OpenRouter