GoogleGemini 3.5 Flash LiteVSxAIGrok 4.20

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

Our Take

This matchup represents a clear tradeoff between peak intelligence and budget efficiency. Grok 4.20 is noticeably superior (holding a 4.2% average lead in benchmarks), but it carries a significant 3.5x price premium. Choose Grok 4.20 if you need top-tier reasoning or code debugging, but for high-volume pipelines, Gemini 3.5 Flash Lite is the smarter business decision.

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Model Specs

Gemini 3.5 Flash Lite

Website

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+2.4%)

54.2%

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

Reasoning (gpqa-diamond)

84%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)3.5x cheaper

$0.85Input: $0.30 | Output: $2.50

Context Window

1.05M tokens

Model Specs

Grok 4.20

Website

Benchmarks & Scores

Coding (swe-bench-pro)

51.8%

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

Reasoning (gpqa-diamond)Winner (+6.0%)

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 3.5 Flash Lite vs Grok 4.20

Gemini 3.5 Flash Lite is cheaper than Grok 4.20. Gemini 3.5 Flash Lite has a blended cost of $0.85/1M tokens, which is about 3.5x cheaper than Grok 4.20 at $3.00/1M tokens.

Gemini 3.5 Flash Lite is better for coding tasks on this benchmark. It scores 54.2% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to Grok 4.20 which scores 51.8%.

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