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Model comparison

Gemini 2.5 Flash vs Gemini 3 Flash

Data verified

Head-to-head evidence from 15 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

48.09/100
Margin
12.4pts
winning →
60.49/100
0 category wins1 category wins

Public leaderboard positions: Gemini 2.5 Flash #130 (Supported); Gemini 3 Flash #49 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 2.5 Flash and Gemini 3 Flash share 15 comparable benchmark results. 1 of 8 categories are comparable. 0 results are unique to Gemini 2.5 Flash; 4 to Gemini 3 Flash.

Updated July 20, 2026
Shared results
15
Gemini 2.5 Flash only
0
Gemini 3 Flash only
4
Comparable categories
1 / 8

Pick Gemini 3 Flash if you want the stronger benchmark profile. Gemini 2.5 Flash only becomes the better choice if you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 15 shared benchmark results across 7 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Gemini 3 Flash is clearly ahead on the BenchAlign aggregate, 60.49 to 48.09. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Gemini 3 Flash's sharpest advantage is in mathematics, where it averages 27.8 against 4.7. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 4.844% to 35.640%.

Gemini 3 Flash is also the more expensive model on tokens at $0.50 input / $3.00 output per 1M tokens, versus $0.30 input / $2.50 output per 1M tokens for Gemini 2.5 Flash.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Gemini 2.5 Flash and Gemini 3 Flash
CategoryGemini 2.5 FlashΔGemini 3 Flash
MathGemini 2.5 Flash4.7Margin→ 23.1Gemini 3 Flash27.8

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Gemini 2.5 FlashB · Gemini 3 Flash

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 4.844%B 35.640%
    Winner: Gemini 3 FlashΔ 30.8
    FrontierMath v2 (Tiers 1-3): Gemini 2.5 Flash scored 4.844%; Gemini 3 Flash scored 35.640%. Gemini 3 Flash wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricGemini 2.5 FlashGemini 3 FlashComparison
Input / output priceUSD per 1M tokensGemini 2.5 Flash$0.3 input / $2.5 outputGemini 3 Flash$0.5 input / $3 outputGemini 2.5 Flash has the lower combined listed price.
Generation speedtokens per secondGemini 2.5 Flash221 tok/sGemini 3 Flash159 tok/sGemini 2.5 Flash has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 2.5 Flash0.50 sGemini 3 Flash1.19 sGemini 2.5 Flash reaches the first token sooner.
Context windowmaximum listed tokensGemini 2.5 Flash1MGemini 3 Flash1MListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
τ²-bench resultsSource 14.9%43.3%Gemini 3 Flash leads
Claw-EvalSource —49.2%Not comparable
Gert LabsSource —56.63%Not comparable
JobBenchSource —11.4%Not comparable
Coding
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
AA-SciCodeSource 29.1%49.9%Gemini 3 Flash leads
Vibe Code BenchSource —20.20%Not comparable
Reasoning
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
AA-LCRSource 45.9%48.0%Gemini 3 Flash leads
CritPtSource 1.4%1.4%Tie
Knowledge
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
Artificial Analysis Intelligence IndexSource 14.1%27.4%Gemini 3 Flash leads
AA-GPQA DiamondSource 68.3%81.2%Gemini 3 Flash leads
AA-HLESource 5.1%14.1%Gemini 3 Flash leads
AA-Omniscience IndexSource -42.0%-3.6%Gemini 3 Flash leads
AA-Omniscience AccuracySource 26.5%45.5%Gemini 3 Flash leads
AA-Omniscience Hallucination RateSource 93.3%90.2%Gemini 3 Flash leads
MathGemini 3 Flash wins
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
FrontierMath v2 (Tiers 1-3)Source 4.844%35.640%Gemini 3 Flash leads
FrontierMath v2 (Tier 4)Source 4.167%4.167%Tie
Multimodal
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
AA-MMMU-ProSource 65.5%78.6%Gemini 3 Flash leads
Design Arena WebsiteSource 11481228Gemini 3 Flash leads
Inst. Following
BenchmarkGemini 2.5 FlashGemini 3 FlashResult
AA-IFBenchSource 39.0%55.1%Gemini 3 Flash leads
Frequently Asked Questions (2)

Which is better, Gemini 2.5 Flash or Gemini 3 Flash?

Gemini 3 Flash is ahead on BenchLM's BenchAlign leaderboard, 60.49 to 48.09. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 4.844% and 35.640%.

Which is better for math, Gemini 2.5 Flash or Gemini 3 Flash?

Gemini 3 Flash has the edge for math in this comparison, averaging 27.8 versus 4.7. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

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Last updated: July 20, 2026

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