GoogleGemini 2.5 ProVSGoogleGemini 3.1 Flash-Lite
Our Take
We recommend Gemini 2.5 Pro if you need peak intelligence for complex multi-file code and clearly defined tasks, or the 6.1x cheaper Gemini 3.1 Flash-Lite if your workflow is limited to scripting single-file apps or clearly defined functions. While Gemini 2.5 Pro holds a major reasoning advantage, Gemini 3.1 Flash-Lite is optimized for high-volume budget pipelines. Choose Gemini 2.5 Pro for multi-file code and clearly defined tasks, or Gemini 3.1 Flash-Lite to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Gemini 2.5 Pro was evaluated on SWE-bench Verified (scoring 59.6%), while Gemini 3.1 Flash-Lite was evaluated on LiveCodeBench (scoring 72%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 2.5 Pro scored 84.4%, while Gemini 3.1 Flash-Lite scored 82.2%.
Cost Efficiency: Gemini 3.1 Flash-Lite pricing ($0.25/M input, $1.5/M output) is 6.1x cheaper than Gemini 2.5 Pro ($1.25/M input, $10/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)
59.6%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)Winner (+2.2%)
84.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$3.44Input: $1.25 | Output: $10.00Context Window
1.05M tokensBenchmarks & Scores
Coding (live-code-bench)
72%scripting single-file apps or clearly defined functions
Reasoning (gpqa-diamond)
82.2%graduate-level science QA
Cost & Context
Cost (per 1M tokens)6.1x cheaper
$0.56Input: $0.25 | Output: $1.50Context Window
1.05M tokensFrequently Asked Questions about Gemini 2.5 Pro vs Gemini 3.1 Flash-Lite
Gemini 3.1 Flash-Lite is cheaper than Gemini 2.5 Pro. Gemini 3.1 Flash-Lite has a blended cost of $0.56/1M tokens, which is about 6.1x cheaper than Gemini 2.5 Pro at $3.44/1M tokens.
For coding tasks, Gemini 2.5 Pro scores 59.6% on swe-bench-verified (multi-file code and clearly defined tasks), while Gemini 3.1 Flash-Lite scores 72% on live-code-bench (scripting single-file apps or clearly defined functions).
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