GoogleGemini 2.5 ProVSGoogleGemini 3 Flash
Our Take
We recommend choosing Gemini 3 Flash because it outperforms or matches Gemini 2.5 Pro across reasoning, coding, and context capacity while being cheaper or equal in cost. Choose Gemini 3 Flash for superior overall value.
▶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 Pro scored 59.6%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3 Flash scored 90.4%, while Gemini 2.5 Pro scored 84.4%.
Context Window: Gemini 3 Flash supports a 1M context window compared to 1M for Gemini 2.5 Pro.
Cost Comparison: Gemini 3 Flash blended CPM is $0.5/$3 compared to $1.25/$10 for Gemini 2.5 Pro.
Was this recommendation helpful?
Benchmarks & Scores
Coding (swe-bench-verified)
59.6%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)
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 (swe-bench-verified)Winner (+18.4%)
78%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)Winner (+6.0%)
90.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)3.1x cheaper
$1.13Input: $0.50 | Output: $3.00Context Window
1.05M tokensFrequently Asked Questions about Gemini 2.5 Pro vs Gemini 3 Flash
Gemini 3 Flash is cheaper than Gemini 2.5 Pro. Gemini 3 Flash has a blended cost of $1.13/1M tokens, which is about 3.1x cheaper than Gemini 2.5 Pro at $3.44/1M 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 Pro which scores 59.6%.
Related Matchups
Explore similar comparisons for Gemini 2.5 Pro and Gemini 3 Flash.
Do you want to find a model for your constraints?
Use our interactive model finder to filter LLMs by reasoning capability, coding performance, cost, and context length.