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Gemini 3.1 Pro vs Gemini 3.5 Flash

2 vs 0 benchmarks won

Google
Gemini 3.1 Pro
Google
Gemini 3.5 Flash
Overview
CompanyGoogleGoogle
Release dateFeb 19 2026May 19 2026
Model type
Open sourceNoNo
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
94.3%
Software engineering
SWE-Bench Verified
80.6%
Multimodal understanding
MMMU
Timeline
Release gapGemini 3.1 Pro shipped 89 days before Gemini 3.5 Flash

Which is better: Gemini 3.1 Pro or Gemini 3.5 Flash?

Gemini 3.1 Pro leads Gemini 3.5 Flash on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Gemini 3.1 Pro shipped 89 days before Gemini 3.5 Flash, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Gemini 3.1 Pro released?
Gemini 3.1 Pro was released by Google on Feb 19 2026.
When was Gemini 3.5 Flash released?
Gemini 3.5 Flash was released by Google on May 19 2026.

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