GoogleGemini 3 FlashVSOpenAIGPT-5 mini
Our Take
We recommend Gemini 3 Flash for complex multi-file code and clearly defined tasks, or the 1.6x cheaper GPT-5 mini if your budget requires optimizing costs for very high-volume pipelines. While Gemini 3 Flash offers a clear reasoning advantage, it carries a moderate price premium. Choose Gemini 3 Flash for multi-file code and clearly defined tasks, or GPT-5 mini to save on API costs for simple scripts.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Gemini 3 Flash was evaluated on SWE-bench Verified (scoring 78%), while GPT-5 mini was evaluated on SWE-bench Pro (scoring 45.7%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3 Flash scored 90.4%, while GPT-5 mini scored 81.6%.
Cost Efficiency: GPT-5 mini pricing ($0.25/M input, $2/M output) is 1.6x cheaper than Gemini 3 Flash ($0.5/M input, $3/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)
78%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)Winner (+8.8%)
90.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$1.13Input: $0.50 | Output: $3.00Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
45.7%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)
81.6%graduate-level science QA
Cost & Context
Cost (per 1M tokens)1.6x cheaper
$0.69Input: $0.25 | Output: $2.00Context Window
400k tokensFrequently Asked Questions about Gemini 3 Flash vs GPT-5 mini
GPT-5 mini is cheaper than Gemini 3 Flash. GPT-5 mini has a blended cost of $0.69/1M tokens, which is about 1.6x cheaper than Gemini 3 Flash at $1.13/1M tokens.
For coding tasks, Gemini 3 Flash scores 78% on swe-bench-verified (multi-file code and clearly defined tasks), while GPT-5 mini scores 45.7% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).
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