GoogleGemini 3.5 FlashVSOpenAIGPT-5 mini
Our Take
We recommend Gemini 3.5 Flash if you need peak intelligence for reasoning and coding tasks, or the 4.9x cheaper GPT-5 mini to optimize your budget for high-volume pipelines. While Gemini 3.5 Flash holds a clear performance lead, it carries a heavy price premium. Choose Gemini 3.5 Flash for complex logic, or GPT-5 mini for budget efficiency.
▶WHY?
Benchmark Calculations & Evidence:
Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Gemini 3.5 Flash scored 55.1%, while GPT-5 mini scored 45.7%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.5 Flash scored 92.2%, while GPT-5 mini scored 81.6%.
Cost Efficiency: GPT-5 mini pricing ($0.25/M input, $2/M output) is 4.9x cheaper than Gemini 3.5 Flash ($1.5/M input, $9/M output).
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Benchmarks & Scores
Coding (swe-bench-pro)Winner (+9.4%)
55.1%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+10.6%)
92.2%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$3.38Input: $1.50 | Output: $9.00Context 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)4.9x cheaper
$0.69Input: $0.25 | Output: $2.00Context Window
400k tokensFrequently Asked Questions about Gemini 3.5 Flash vs GPT-5 mini
GPT-5 mini is cheaper than Gemini 3.5 Flash. GPT-5 mini has a blended cost of $0.69/1M tokens, which is about 4.9x cheaper than Gemini 3.5 Flash at $3.38/1M tokens.
Gemini 3.5 Flash is better for coding tasks on this benchmark. It scores 55.1% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to GPT-5 mini which scores 45.7%.
Related Matchups
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