Google Gemini 3.1 Pro VS xAI Grok 4.5

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

👑Our Take

Grok 4.5 is the superior choice here. It holds a 5.9% average lead in benchmarks while actually being more cost-effective (saving 1.5x on API costs compared to Gemini 3.1 Pro). Unless you have specific provider lock-in, go with Grok 4.5.

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Model Specs

Gemini 3.1 Pro

Website

Benchmarks & Scores

Coding (swe-bench-pro)

54.2%

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

Reasoning (gpqa-diamond)Winner (+1.3%)

94.3%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)

$4.50Input: $2.00 | Output: $12.00

Context WindowLarger

1.05M tokens

Model Specs

Grok 4.5

Website

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+10.5%)

64.7%

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

Reasoning (gpqa-diamond)

93%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)1.5x cheaper

$3.00Input: $2.00 | Output: $6.00

Context Window

500k tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 3.1 Pro vs Grok 4.5 comparison

Grok 4.5 is cheaper than Gemini 3.1 Pro. Grok 4.5 has a blended cost of $3.00/1M tokens, which is about 1.5x cheaper than Gemini 3.1 Pro at $4.50/1M tokens.

Grok 4.5 is better for coding tasks on this benchmark. It scores 64.7% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to Gemini 3.1 Pro which scores 54.2%.

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