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Gemini 3 Flash

VS
xAI

Grok 4.20

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

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, Grok 4.20 is the premium intelligence choice, scoring 17.2% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: Gemini 3 Flash is 2.7x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, Gemini 3 Flash offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of Grok 4.20 fully justifies the cost.

Model Specs

Gemini 3 Flash

Benchmarks & Scores

Coding (swe-bench-pro)
34.6%
Reasoning (gpqa-diamond)Winner (+0.4%)
90.4%

Cost & Performance

Cost (per 1M tokens)2.7x cheaper
$1.13Input: $0.50 | Output: $3.00
Speed
159 tps
Context Window
1M tokens
Model Specs

Grok 4.20

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+17.2%)
51.8%
Reasoning (gpqa-diamond)
90%

Cost & Performance

Cost (per 1M tokens)
$3.00Input: $2.00 | Output: $6.00
Speed1.5x faster
233 tps
Context Window
1M tokens
Read our data collection methodology

Frequently Asked Questions

Gemini 3 Flash is cheaper than Grok 4.20. Gemini 3 Flash has a blended cost of $1.13/1M tokens, which is about 2.7x cheaper than Grok 4.20 at $3.00/1M tokens.

Grok 4.20 is faster than Gemini 3 Flash. Grok 4.20 generates 233 tokens per second (tps) compared to Gemini 3 Flash which generates 159 tokens per second.

Grok 4.20 is better for coding tasks. It scores 51.8% on coding evaluations (swe-bench-pro) compared to Gemini 3 Flash which scores 34.6%.

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