GoogleGemini 3.1 Flash-LiteVSxAIGrok 4.20

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

Our Take

We recommend Grok 4.20 if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 5.3x cheaper Gemini 3.1 Flash-Lite if your workflow is limited to scripting single-file apps or clearly defined functions. While Grok 4.20 holds a major reasoning advantage, Gemini 3.1 Flash-Lite is optimized for high-volume budget pipelines. Choose Grok 4.20 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 Grok 4.20 was evaluated on SWE-bench Pro (scoring 51.8%).

Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Grok 4.20 scored 90%, 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 5.3x cheaper than Grok 4.20 ($2/M input, $6/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)5.3x cheaper

$0.56Input: $0.25 | Output: $1.50

Context Window

1.05M tokens

Model Specs

Grok 4.20

Website

Benchmarks & Scores

Coding (swe-bench-pro)

51.8%

complex codebases, multi-file repositories, and architectural planning

Reasoning (gpqa-diamond)Winner (+7.8%)

90%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$3.00Input: $2.00 | Output: $6.00

Context Window

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 3.1 Flash-Lite vs Grok 4.20

Gemini 3.1 Flash-Lite is cheaper than Grok 4.20. Gemini 3.1 Flash-Lite has a blended cost of $0.56/1M tokens, which is about 5.3x cheaper than Grok 4.20 at $3.00/1M tokens.

For coding tasks, Gemini 3.1 Flash-Lite scores 72% on live-code-bench (scripting single-file apps or clearly defined functions), while Grok 4.20 scores 51.8% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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