GoogleGemini 3 FlashVSGoogleGemini 3.1 Pro
Our Take
We recommend Gemini 3.1 Pro if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 4.0x cheaper Gemini 3 Flash if your workflow is limited to multi-file code and clearly defined tasks. While Gemini 3.1 Pro holds a major reasoning advantage, Gemini 3 Flash is optimized for high-volume budget pipelines. Choose Gemini 3.1 Pro for architectural codebase planning, or Gemini 3 Flash to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Gemini 3 Flash was evaluated on SWE-bench Verified (scoring 78%), while Gemini 3.1 Pro was evaluated on SWE-bench Pro (scoring 54.2%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.1 Pro scored 94.3%, while Gemini 3 Flash scored 90.4%.
Cost Efficiency: Gemini 3 Flash pricing ($0.5/M input, $3/M output) is 4.0x cheaper than Gemini 3.1 Pro ($2/M input, $12/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)
78%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)
90.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)4.0x cheaper
$1.13Input: $0.50 | Output: $3.00Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
54.2%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+3.9%)
94.3%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$4.50Input: $2.00 | Output: $12.00Context Window
1.05M tokensFrequently Asked Questions about Gemini 3 Flash vs Gemini 3.1 Pro
Gemini 3 Flash is cheaper than Gemini 3.1 Pro. Gemini 3 Flash has a blended cost of $1.13/1M tokens, which is about 4.0x cheaper than Gemini 3.1 Pro at $4.50/1M tokens.
For coding tasks, Gemini 3 Flash scores 78% on swe-bench-verified (multi-file code and clearly defined tasks), while Gemini 3.1 Pro scores 54.2% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).
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