GoogleGemini 2.5 FlashVSGoogleGemini 2.5 Pro
Our Take
We recommend Gemini 2.5 Pro if your workflow requires peak reasoning performance, or the 4.0x cheaper Gemini 2.5 Flash to optimize your API budget. While both models deliver similar coding capabilities, Gemini 2.5 Pro holds a clear lead in reasoning. Choose Gemini 2.5 Pro for complex logic, or Gemini 2.5 Flash for cost optimization.
▶WHY?
Benchmark Calculations & Evidence:
Coding Benchmarks: Both models were evaluated on the SWE-bench Verified benchmark. Gemini 2.5 Flash scored 60.4%, while Gemini 2.5 Pro scored 59.6%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Gemini 2.5 Flash scored 68.3%, while Gemini 2.5 Pro scored 84.4%.
Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 4.0x cheaper than Gemini 2.5 Pro ($1.25/M input, $10/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)Winner (+0.8%)
60.4%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)
68.3%graduate-level science QA
Cost & Context
Cost (per 1M tokens)4.0x cheaper
$0.85Input: $0.30 | Output: $2.50Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-verified)
59.6%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)Winner (+16.1%)
84.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$3.44Input: $1.25 | Output: $10.00Context Window
1.05M tokensFrequently Asked Questions about Gemini 2.5 Flash vs Gemini 2.5 Pro
Gemini 2.5 Flash is cheaper than Gemini 2.5 Pro. Gemini 2.5 Flash has a blended cost of $0.85/1M tokens, which is about 4.0x cheaper than Gemini 2.5 Pro at $3.44/1M tokens.
Gemini 2.5 Flash is better for coding tasks on this benchmark. It scores 60.4% on swe-bench-verified (multi-file code and clearly defined tasks) compared to Gemini 2.5 Pro which scores 59.6%.
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