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Gemini 3.1 Pro

VS
xAI

Grok 4.20

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

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, Gemini 3.1 Pro is the premium intelligence choice, scoring 2.4% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: Grok 4.20 is 1.5x cheaper to run and delivers 2.1x faster throughput. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, Grok 4.20 offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of Gemini 3.1 Pro fully justifies the cost.

Model Specs

Gemini 3.1 Pro

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+2.4%)
54.2%
Reasoning (gpqa-diamond)Winner (+4.3%)
94.3%

Cost & Performance

Cost (per 1M tokens)
$4.50Input: $2.00 | Output: $12.00
Speed
109 tps
Context Window
1M tokens
Model Specs

Grok 4.20

Benchmarks & Scores

Coding (swe-bench-pro)
51.8%
Reasoning (gpqa-diamond)
90%

Cost & Performance

Cost (per 1M tokens)1.5x cheaper
$3.00Input: $2.00 | Output: $6.00
Speed2.1x faster
233 tps
Context Window
1M tokens
Read our data collection methodology

Frequently Asked Questions

Grok 4.20 is cheaper than Gemini 3.1 Pro. Grok 4.20 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 4.20 is faster than Gemini 3.1 Pro. Grok 4.20 generates 233 tokens per second (tps) compared to Gemini 3.1 Pro which generates 109 tokens per second.

Gemini 3.1 Pro is better for coding tasks. It scores 54.2% on coding evaluations (swe-bench-pro) compared to Grok 4.20 which scores 51.8%.

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