GoogleGemini 3.1 Flash-LiteVSGoogleGemini 3.1 Pro

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

We recommend Gemini 3.1 Pro if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 8.0x cheaper Gemini 3.1 Flash-Lite if your workflow is limited to scripting single-file apps or clearly defined functions. While Gemini 3.1 Pro holds a major reasoning advantage, Gemini 3.1 Flash-Lite is optimized for high-volume budget pipelines. Choose Gemini 3.1 Pro for architectural codebase planning, or Gemini 3.1 Flash-Lite to maximize your budget for basic scripts.

▶WHY?

Benchmark Calculations & Evidence:

Coding Evaluation: Gemini 3.1 Flash-Lite was evaluated on LiveCodeBench (scoring 72%), while Gemini 3.1 Pro was evaluated on SWE-bench Pro (scoring 54.2%).

Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.1 Pro scored 94.3%, while Gemini 3.1 Flash-Lite scored 82.2%.

Cost Efficiency: Gemini 3.1 Flash-Lite pricing ($0.25/M input, $1.5/M output) is 8.0x cheaper than Gemini 3.1 Pro ($2/M input, $12/M output).

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Model Specs

Gemini 3.1 Flash-Lite

Website

Benchmarks & Scores

Coding (live-code-bench)

72%

scripting single-file apps or clearly defined functions

Reasoning (gpqa-diamond)

82.2%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)8.0x cheaper

$0.56Input: $0.25 | Output: $1.50

Context Window

1.05M tokens

Model Specs

Gemini 3.1 Pro

Website

Benchmarks & Scores

Coding (swe-bench-pro)

54.2%

complex codebases, multi-file repositories, and architectural planning

Reasoning (gpqa-diamond)Winner (+12.1%)

94.3%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$4.50Input: $2.00 | Output: $12.00

Context Window

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 3.1 Flash-Lite vs Gemini 3.1 Pro

Gemini 3.1 Flash-Lite is cheaper than Gemini 3.1 Pro. Gemini 3.1 Flash-Lite has a blended cost of $0.56/1M tokens, which is about 8.0x cheaper than Gemini 3.1 Pro at $4.50/1M tokens.

For coding tasks, Gemini 3.1 Flash-Lite scores 72% on live-code-bench (scripting single-file apps or clearly defined functions), while Gemini 3.1 Pro scores 54.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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