GoogleGemini 2.5 FlashVSGoogleGemini 3 Flash
Our Take
We recommend Gemini 3 Flash for its clear benchmark advantage, or the 1.3x cheaper Gemini 2.5 Flash only if your budget requires optimizing costs for very high-volume pipelines. While Gemini 3 Flash offers superior reasoning and coding, it carries a moderate price premium. Choose Gemini 3 Flash for quality, 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 3 Flash scored 78%, while Gemini 2.5 Flash scored 60.4%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3 Flash scored 90.4%, while Gemini 2.5 Flash scored 68.3%.
Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 1.3x cheaper than Gemini 3 Flash ($0.5/M input, $3/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)1.3x cheaper
$0.85Input: $0.30 | Output: $2.50Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-verified)Winner (+17.6%)
78%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)Winner (+22.1%)
90.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$1.13Input: $0.50 | Output: $3.00Context Window
1.05M tokensFrequently Asked Questions about Gemini 2.5 Flash vs Gemini 3 Flash
Gemini 2.5 Flash is cheaper than Gemini 3 Flash. Gemini 2.5 Flash has a blended cost of $0.85/1M tokens, which is about 1.3x cheaper than Gemini 3 Flash at $1.13/1M tokens.
Gemini 3 Flash is better for coding tasks on this benchmark. It scores 78% on swe-bench-verified (multi-file code and clearly defined tasks) compared to Gemini 2.5 Flash which scores 60.4%.
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