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Google Gemini 3.1 Flash-Lite VS xAI Grok 4.5

✍️ 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 Grok 4.5 on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) — but Grok 4.5 holds a clear reasoning advantage (+6.1% on GPQA Diamond). However, Gemini 3.1 Flash-Lite is a massive 5.3x cheaper to run. Choose Grok 4.5 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

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 & Performance

Cost (per 1M tokens)5.3x cheaper
$0.56Input: $0.25 | Output: $1.50
Context WindowLarger
1.05M tokens
Model Specs

Grok 4.5

Benchmarks & Scores

Coding (swe-bench-pro)
64.7%

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

Reasoning (gpqa-diamond)Winner (+6.1%)
93%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)
$3.00Input: $2.00 | Output: $6.00
Context Window
500k tokens

Frequently Asked Questions about Gemini 3.1 Flash-Lite vs Grok 4.5 comparison

Gemini 3.1 Flash-Lite is cheaper than Grok 4.5. Gemini 3.1 Flash-Lite has a blended cost of $0.56/1M tokens, which is about 5.3x cheaper than Grok 4.5 at $3.00/1M 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 Grok 4.5 scores 64.7% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases).