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Model comparison

Gemini 3.1 Pro vs Gemini 3 Flash

Data verified

Head-to-head evidence from 18 shared benchmark results across 7 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

55.3/100
Margin
5.2pts
winning →
60.49/100
1 category wins0 category wins

Public leaderboard positions: Gemini 3.1 Pro #83 (Estimated); Gemini 3 Flash #49 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 3.1 Pro and Gemini 3 Flash share 18 comparable benchmark results. 1 of 8 categories are comparable. 29 results are unique to Gemini 3.1 Pro; 1 to Gemini 3 Flash.

Updated July 20, 2026
Shared results
18
Gemini 3.1 Pro only
29
Gemini 3 Flash only
1
Comparable categories
1 / 8

Pick Gemini 3 Flash if you want the stronger benchmark profile. Gemini 3.1 Pro only becomes the better choice if mathematics is the priority.

Confidence note. This is a partial-evidence comparison with 18 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 55.3. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Gemini 3.1 Pro is also the more expensive model on tokens at $2.00 input / $12.00 output per 1M tokens, versus $0.50 input / $3.00 output per 1M tokens for Gemini 3 Flash. That is roughly 4.0x on output cost alone.

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 3.1 Pro and Gemini 3 Flash
CategoryGemini 3.1 ProΔGemini 3 Flash
MathGemini 3.1 Pro31.8Margin← 4.0Gemini 3 Flash27.8
ReasoningGemini 3.1 Pro77.1MarginNo overlapGemini 3 FlashNot measured
MultimodalGemini 3.1 Pro82.6MarginNo overlapGemini 3 FlashNot measured

Decisive benchmark drivers

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

More
A · Gemini 3.1 ProB · Gemini 3 Flash

  1. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 16.700%B 4.167%
    Winner: Gemini 3.1 ProΔ 12.5
    FrontierMath v2 (Tier 4): Gemini 3.1 Pro scored 16.700%; Gemini 3 Flash scored 4.167%. Gemini 3.1 Pro wins this benchmark.

  2. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 36.900%B 35.640%
    Winner: Gemini 3.1 ProΔ 1.3
    FrontierMath v2 (Tiers 1-3): Gemini 3.1 Pro scored 36.900%; Gemini 3 Flash scored 35.640%. Gemini 3.1 Pro wins this benchmark.

Operational comparison

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

MetricGemini 3.1 ProGemini 3 FlashComparison
Input / output priceUSD per 1M tokensGemini 3.1 Pro$2 input / $12 outputGemini 3 Flash$0.5 input / $3 outputGemini 3 Flash has the lower combined listed price.
Generation speedtokens per secondGemini 3.1 Pro109 tok/sGemini 3 Flash159 tok/sGemini 3 Flash has the higher measured throughput.
First-answer latencyseconds to first tokenGemini 3.1 Pro29.71 sGemini 3 Flash1.19 sGemini 3 Flash reaches the first token sooner.
Context windowmaximum listed tokensGemini 3.1 Pro1MGemini 3 Flash1MListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkGemini 3.1 ProGemini 3 FlashResult
Claw-EvalSource 57.8%49.2%Gemini 3.1 Pro leads
DeepSearchQASource 69.7%—Not comparable
τ²-bench resultsSource 95.6%43.3%Gemini 3.1 Pro leads
AA Agentic IndexSource 21.4%—Not comparable
APEX-Agents-AASource 32.0%—Not comparable
GDPval-AASource 23.2%—Not comparable
GDPval-AASource 965—Not comparable
Gert LabsSource 56.87%56.63%Gemini 3.1 Pro leads
ResearchClawBenchSource 13.3%—Not comparable
AA AutomationBenchSource 37.5%—Not comparable
AA EnterpriseOps-GymSource 42.2%—Not comparable
AA Harvey LABSource 0.0%—Not comparable
AA ITBenchSource 30.3%—Not comparable
AA Tau3 BankingSource 16.5%—Not comparable
terminalBenchHardSource 53.8%—Not comparable
aaTerminalBench21Source 73.8%—Not comparable
JobBenchSource —11.4%Not comparable
Coding
BenchmarkGemini 3.1 ProGemini 3 FlashResult
LiveCodeBench ProSource 82.9%—Not comparable
React Native EvalsSource 78.9%—Not comparable
Vibe Code BenchSource 32.03%20.20%Gemini 3.1 Pro leads
AA Coding IndexSource 68.8%—Not comparable
AA-SciCodeSource 58.9%49.9%Gemini 3.1 Pro leads
Reasoning
BenchmarkGemini 3.1 ProGemini 3 FlashResult
ARC-AGI-2Source 77.1%—Not comparable
AA-LCRSource 72.7%48.0%Gemini 3.1 Pro leads
CritPtSource 17.7%1.4%Gemini 3.1 Pro leads
Knowledge
BenchmarkGemini 3.1 ProGemini 3 FlashResult
GPQA-DSource 94.3%—Not comparable
HLE w/o toolsSource 45.4%—Not comparable
HealthBench HardSource 20.6%—Not comparable
MedXpertQA (Text)Source 71.5%—Not comparable
Artificial Analysis Intelligence IndexSource 46.5%27.4%Gemini 3.1 Pro leads
AA-GPQA DiamondSource 94.1%81.2%Gemini 3.1 Pro leads
AA-HLESource 44.7%14.1%Gemini 3.1 Pro leads
AA-Omniscience IndexSource 32.9%-3.6%Gemini 3.1 Pro leads
AA-Omniscience AccuracySource 55.3%45.5%Gemini 3.1 Pro leads
AA-Omniscience Hallucination RateSource 49.9%90.2%Gemini 3.1 Pro leads
MathGemini 3.1 Pro wins
BenchmarkGemini 3.1 ProGemini 3 FlashResult
FrontierMath v2 (Tiers 1-3)Source 36.900%35.640%Gemini 3.1 Pro leads
FrontierMath v2 (Tier 4)Source 16.700%4.167%Gemini 3.1 Pro leads
Multilingual
BenchmarkGemini 3.1 ProGemini 3 FlashResult
AA Global-MMLU-LiteSource 93.2%—Not comparable
Multimodal
BenchmarkGemini 3.1 ProGemini 3 FlashResult
MMMU-ProSource 83.9%—Not comparable
CharXivSource 80.2%—Not comparable
ERQASource 69.4%—Not comparable
SimpleVQASource 72.4%—Not comparable
ScreenSpot ProSource 84.4%—Not comparable
ZeroBenchSource 29.0%—Not comparable
MedXpertQA (MM)Source 81.3%—Not comparable
AA-MMMU-ProSource 82.4%78.6%Gemini 3.1 Pro leads
Design Arena WebsiteSource 12841228Gemini 3.1 Pro leads
Inst. Following
BenchmarkGemini 3.1 ProGemini 3 FlashResult
AA-IFBenchSource 77.1%55.1%Gemini 3.1 Pro leads
Frequently Asked Questions (2)

Which is better, Gemini 3.1 Pro or Gemini 3 Flash?

Gemini 3 Flash is ahead on BenchLM's BenchAlign leaderboard, 60.49 to 55.3. The biggest single separator in this matchup is FrontierMath v2 (Tier 4), where the scores are 16.700% and 4.167%.

Which is better for math, Gemini 3.1 Pro or Gemini 3 Flash?

Gemini 3.1 Pro has the edge for math in this comparison, averaging 31.8 versus 27.8. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.

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Last updated: July 20, 2026

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