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Gemini 2.5 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 51.8% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: Gemini 2.5 Flash is 3.5x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, Gemini 2.5 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 2.5 Flash

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)
68.3%

Cost & Performance

Cost (per 1M tokens)3.5x cheaper
$0.85Input: $0.30 | Output: $2.50
Speed
221 tps
Context Window
1M tokens
Model Specs

Grok 4.20

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
51.8%
Reasoning (gpqa-diamond)Winner (+21.7%)
90%

Cost & Performance

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

Frequently Asked Questions

Gemini 2.5 Flash is cheaper than Grok 4.20. Gemini 2.5 Flash has a blended cost of $0.85/1M tokens, which is about 3.5x cheaper than Grok 4.20 at $3.00/1M tokens.

Grok 4.20 is faster than Gemini 2.5 Flash. Grok 4.20 generates 233 tokens per second (tps) compared to Gemini 2.5 Flash which generates 221 tokens per second.

Grok 4.20 is better for coding tasks. It scores 51.8% on coding evaluations (swe-bench-pro) compared to Gemini 2.5 Flash which scores N/A.

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