GoogleGemini 2.5 FlashVSxAIGrok 4.20
Our Take
We recommend Grok 4.20 if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 3.5x cheaper Gemini 2.5 Flash if your workflow is limited to multi-file code and clearly defined tasks. While Grok 4.20 holds a major reasoning advantage, Gemini 2.5 Flash is optimized for high-volume budget pipelines. Choose Grok 4.20 for architectural codebase planning, or Gemini 2.5 Flash to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Gemini 2.5 Flash was evaluated on SWE-bench Verified (scoring 60.4%), while Grok 4.20 was evaluated on SWE-bench Pro (scoring 51.8%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Grok 4.20 scored 90%, while Gemini 2.5 Flash scored 68.3%.
Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 3.5x cheaper than Grok 4.20 ($2/M input, $6/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)
60.4%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)
68.3%graduate-level science QA
Cost & Context
Cost (per 1M tokens)3.5x cheaper
$0.85Input: $0.30 | Output: $2.50Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
51.8%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+21.7%)
90%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$3.00Input: $2.00 | Output: $6.00Context Window
1.05M tokensFrequently Asked Questions about Gemini 2.5 Flash vs Grok 4.20
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.
For coding tasks, Gemini 2.5 Flash scores 60.4% on swe-bench-verified (multi-file code and clearly defined tasks), while Grok 4.20 scores 51.8% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).
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