GoogleGemini 2.5 FlashVSOpenAIGPT-5 mini
Our Take
We recommend GPT-5 mini for superior overall value and reasoning capabilities, as it is cheaper or equal in cost while delivering peak intelligence. While GPT-5 mini excels at complex complex codebases, multi-file repositories, and architectural planning, Gemini 2.5 Flash is suited for scripting multi-file code and clearly defined tasks. Choose GPT-5 mini for architectural codebase planning, or Gemini 2.5 Flash if you specifically require its simpler functions profile.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Gemini 2.5 Flash was evaluated on SWE-bench Verified (scoring 60.4%), while GPT-5 mini was evaluated on SWE-bench Pro (scoring 45.7%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. GPT-5 mini scored 81.6%, while Gemini 2.5 Flash scored 68.3%.
Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 0.8x cheaper than GPT-5 mini ($0.25/M input, $2/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)
$0.85Input: $0.30 | Output: $2.50Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
45.7%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+13.3%)
81.6%graduate-level science QA
Cost & Context
Cost (per 1M tokens)1.2x cheaper
$0.69Input: $0.25 | Output: $2.00Context Window
400k tokensFrequently Asked Questions about Gemini 2.5 Flash vs GPT-5 mini
GPT-5 mini is cheaper than Gemini 2.5 Flash. GPT-5 mini has a blended cost of $0.69/1M tokens, which is about 1.2x cheaper than Gemini 2.5 Flash at $0.85/1M tokens.
For coding tasks, Gemini 2.5 Flash scores 60.4% 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).
Related Matchups
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