GoogleGemini 3.1 Flash-LiteVSOpenAIGPT-5 mini

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

Our Take

We recommend GPT-5 mini for complex complex codebases, multi-file repositories, and architectural planning, or the 1.2x cheaper Gemini 3.1 Flash-Lite if your workflow is limited to scripting single-file apps or clearly defined functions. While they share very similar reasoning capabilities, GPT-5 mini handles repository-scale projects whereas Gemini 3.1 Flash-Lite excels at basic functions and scripts. Choose GPT-5 mini for architectural codebase planning, or Gemini 3.1 Flash-Lite to save on API costs for simple scripts.

▶WHY?

Benchmark Calculations & Evidence:

Coding Evaluation: Gemini 3.1 Flash-Lite was evaluated on LiveCodeBench (scoring 72%), while GPT-5 mini was evaluated on SWE-bench Pro (scoring 45.7%).

Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.1 Flash-Lite scored 82.2%, while GPT-5 mini scored 81.6%.

Cost Efficiency: Gemini 3.1 Flash-Lite pricing ($0.25/M input, $1.5/M output) is 1.2x cheaper than GPT-5 mini ($0.25/M input, $2/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)Winner (+0.6%)

82.2%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)1.2x cheaper

$0.56Input: $0.25 | Output: $1.50

Context WindowLarger

1.05M tokens

Model Specs

GPT-5 mini

Website

Benchmarks & Scores

Coding (swe-bench-pro)

45.7%

complex codebases, multi-file repositories, and architectural planning

Reasoning (gpqa-diamond)

81.6%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$0.69Input: $0.25 | Output: $2.00

Context Window

400k tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 3.1 Flash-Lite vs GPT-5 mini

Gemini 3.1 Flash-Lite is cheaper than GPT-5 mini. Gemini 3.1 Flash-Lite has a blended cost of $0.56/1M tokens, which is about 1.2x cheaper than GPT-5 mini at $0.69/1M tokens.

For coding tasks, Gemini 3.1 Flash-Lite scores 72% on live-code-bench (scripting single-file apps or clearly defined functions), while GPT-5 mini scores 45.7% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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