GoogleGemini 3.1 Flash-LiteVSOpenAIGPT-5.5

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

Our Take

These models use different coding evaluation benchmarks — with Gemini 3.1 Flash-Lite evaluated on live-code-bench (good at single-file apps, building games & UIs, and scripting new logic) and GPT-5.5 on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) — but GPT-5.5 holds a clear reasoning advantage (+6.7% on GPQA Diamond). However, Gemini 3.1 Flash-Lite is a massive 20.0x cheaper to run. Choose GPT-5.5 for complex logic and reasoning tasks, or Gemini 3.1 Flash-Lite to optimize your budget for high-volume pipelines.

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Model Specs

Gemini 3.1 Flash-Lite

Website

Benchmarks & Scores

Coding (live-code-bench)

72%

good at single-file apps, building games & UIs, and scripting new logic

Reasoning (gpqa-diamond)

86.9%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)20.0x cheaper

$0.56Input: $0.25 | Output: $1.50

Context Window

1.05M tokens

Model Specs

GPT-5.5

Website

Benchmarks & Scores

Coding (swe-bench-pro)

58.6%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)Winner (+6.7%)

93.6%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$11.25Input: $5.00 | Output: $30.00

Context WindowLarger

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 3.1 Flash-Lite vs GPT-5.5

Gemini 3.1 Flash-Lite is cheaper than GPT-5.5. Gemini 3.1 Flash-Lite has a blended cost of $0.56/1M tokens, which is about 20.0x cheaper than GPT-5.5 at $11.25/1M tokens.

For coding tasks, Gemini 3.1 Flash-Lite scores 72% on live-code-bench (good at single-file apps, building games & UIs, and scripting new logic), while GPT-5.5 scores 58.6% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases).

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