Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview, API pricing and model comparison

Compare Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview in one matrix. Current records: Gemini 3.1 Flash Lite Preview on OpenRouter: $0.25/$1.5 per 1M tokens, 1049K context window; Gemini 3.1 Pro Preview on OpenRouter: $2/$12 per 1M tokens, 1049K context window. Prices are estimates—verify official provider pages before production use.

Gemini 3.1 Flash Lite Preview

google/gemini-3.1-flash-lite-preview

OpenRouter

Input: $0.2500 / 1M
Output: $1.50 / 1M
Context: 1.0m
Model page: Details

Gemini 3.1 Pro Preview

google/gemini-3.1-pro-preview

OpenRouter

Input: $2.00 / 1M
Output: $12.00 / 1M
Context: 1.0m
Model page: Details

Comparison matrixLLM Table

Models to compare2/4

Model 1

1.0M

Select model344 models

Model 2

1.0M

Select model344 models

Google: Gemini 3.1 Flash Lite Preview

OpenRouter

Cheapest (this scenario)

Input

$0.2500 / 1M

Output

$1.50 / 1M

Context

1.0MLargest context

Monthly cost

$70.00

Benchmark

1,433LMArena Text Arena

VisionToolsJSONReasoningAudioLong context

Google: Gemini 3.1 Pro Preview

OpenRouter

Input

$2.00 / 1M

Output

$12.00 / 1M

Context

1.0MLargest context

Monthly cost

$560.00

Benchmark

1,487Top benchmarkLMArena Text Arena

VisionToolsJSONReasoningAudioLong context

Google: Gemini 3.1 Flash Lite Preview

OpenRouter

Google: Gemini 3.1 Pro Preview

OpenRouter

Input

$0.2500 / 1MCheapest (this scenario)

$2.00 / 1M

Output

$1.50 / 1MCheapest (this scenario)

$12.00 / 1M

Context

1.0MLargest context

Benchmark

1,433

LMArena Text Arena

1,487Top benchmark

LMArena Text Arena

Monthly cost

$70.00Cheapest (this scenario)

$560.00

Capabilities

VisionToolsJSONReasoningAudioLong context

FAQ

Model comparison notes

How do Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview API prices compare?

Compare input and output prices per 1M tokens side by side. The same underlying model can list different prices by route (Direct API vs OpenRouter); this table uses the selected route records.

Which model looks cheaper?

Scenario cost depends on your input/output mix. The example monthly cost in the table uses default token volumes—adjust with the cost calculator for your traffic.

Are benchmark scores included?

Independent or provider-reported benchmark signals appear when available. Benchmarks do not replace price analysis—evaluate both for your quality requirements.

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