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Model comparison

Gemini 3.1 Flash-Lite vs Grok 4.20

GoogleGemini 3.1 Flash-Lite
Input
$0.25
Output
$1.50
Context
1M
Released
2026-03-03
Full model page →xAI (Grok)Grok 4.20
Input
$1.25 / 1M tokens
Output
$2.50 / 1M tokens
Context
1M
Released
2026-03
Full model page →
Short answer

Grok 4.20 scores higher on 2 of the 2 benchmarks both models report; Gemini 3.1 Flash-Lite is cheaper on input tokens ($0.3 vs $1.3 per 1M, 5×).

Specs and pricing side by side

SpecGemini 3.1 Flash-LiteGrok 4.20
MakerGooglexAI (Grok)
Released2026-03-032026-03
Context window1M1Msame
Max output64Knot published
Input price$0.25$1.25 / 1M tokens
Output price$1.50$2.50 / 1M tokens
ParametersUndisclosednot published
LicenseProprietaryProprietarysame
WeightsAPI onlyAPI onlysame
ModalitiesText, Vision, Audio, VideoText, Vision
Knowledge cutoffJan 2025November 2024

Benchmarks both models report

BenchmarkGemini 3.1 Flash-LiteGrok 4.20
GPQA Diamond86.9%88.5%
Humanity's Last Exam16%30%

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…

  • Cost matters: input tokens cost 5× less ($0.3 vs $1.3 per 1M).
  • You need Audio / Video input, which Grok 4.20 lacks.
  • Your use case is: reach for it for high-volume, cost-sensitive workloads like translation, classification, and tagging.

Pick Grok 4.20 if…

  • You care about GPQA Diamond, Humanity's Last Exam (it scores higher on 2 shared benchmarks).
  • Your use case is: complex math, science, and multi-step analytical problems that benefit from the reasoning variant.

FAQ

Which is better, Gemini 3.1 Flash-Lite or Grok 4.20?

Grok 4.20 scores higher on 2 of the 2 benchmarks both models report; Gemini 3.1 Flash-Lite is cheaper on input tokens ($0.3 vs $1.3 per 1M, 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 3.1 Flash-Lite?

Gemini 3.1 Flash-Lite: $0.25 input, $1.50 output. Grok 4.20: $1.25 / 1M tokens input, $2.50 / 1M tokens output (list API prices as published by each maker).

What are the context windows of Gemini 3.1 Flash-Lite and Grok 4.20?

Gemini 3.1 Flash-Lite offers 1M with up to 64K output; Grok 4.20 offers 1M.

Is Gemini 3.1 Flash-Lite newer than Grok 4.20?

Gemini 3.1 Flash-Lite was released 2026-03-03; Grok 4.20 was released 2026-03.

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