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Model comparison

Gemini 3.1 Flash-Lite vs Gemini 2.5 Flash-Lite

GoogleGemini 3.1 Flash-Lite
Input
$0.25
Output
$1.50
Context
1M
Released
2026-03-03
Full model page →GoogleGemini 2.5 Flash-Lite
Input
$0.10 / 1M tokens (text / image / video)
Output
$0.40 / 1M tokens
Context
1M
Released
2025-06-17
Full model page →
Short answer

Gemini 3.1 Flash-Lite scores higher on 2 of the 2 benchmarks both models report; Gemini 2.5 Flash-Lite is cheaper on input tokens ($0.1 vs $0.3 per 1M, 2.5×).

Specs and pricing side by side

SpecGemini 3.1 Flash-LiteGemini 2.5 Flash-Lite
MakerGoogleGooglesame
Released2026-03-032025-06-17
Context window1M1Msame
Max output64K64Ksame
Input price$0.25$0.10 / 1M tokens (text / image / video)
Output price$1.50$0.40 / 1M tokens
ParametersUndisclosedUndisclosedsame
LicenseProprietaryProprietary (Google), API-only
WeightsAPI onlyAPI onlysame
ModalitiesText, Vision, Audio, VideoText, Vision, Audio, Video, PDF
Knowledge cutoffJan 2025January 2025

Benchmarks both models report

BenchmarkGemini 3.1 Flash-LiteGemini 2.5 Flash-Lite
GPQA Diamond86.9%64.6%
Humanity's Last Exam16%5.1%

Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.

Which one should you pick?

Pick Gemini 3.1 Flash-Lite if…

  • You care about GPQA Diamond, Humanity's Last Exam (it scores higher on 2 shared benchmarks).
  • Your use case is: reach for it for high-volume, cost-sensitive workloads like translation, classification, and tagging.

Pick Gemini 2.5 Flash-Lite if…

  • Cost matters: input tokens cost 2.5× less ($0.1 vs $0.3 per 1M).
  • You need PDF input, which Gemini 3.1 Flash-Lite lacks.
  • Your use case is: high-volume classification and intelligent request routing.

FAQ

Which is better, Gemini 3.1 Flash-Lite or Gemini 2.5 Flash-Lite?

Gemini 3.1 Flash-Lite scores higher on 2 of the 2 benchmarks both models report; Gemini 2.5 Flash-Lite is cheaper on input tokens ($0.1 vs $0.3 per 1M, 2.5×). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.

How much cheaper is Gemini 2.5 Flash-Lite?

Gemini 3.1 Flash-Lite: $0.25 input, $1.50 output. Gemini 2.5 Flash-Lite: $0.10 / 1M tokens (text / image / video) input, $0.40 / 1M tokens output (list API prices as published by each maker).

What are the context windows of Gemini 3.1 Flash-Lite and Gemini 2.5 Flash-Lite?

Gemini 3.1 Flash-Lite offers 1M with up to 64K output; Gemini 2.5 Flash-Lite offers 1M with up to 64K output.

Is Gemini 3.1 Flash-Lite newer than Gemini 2.5 Flash-Lite?

Gemini 3.1 Flash-Lite was released 2026-03-03; Gemini 2.5 Flash-Lite was released 2025-06-17.

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