Skip to content
ModelCap

Head-to-head comparison

Gemini 3.1 Pro Preview vs Gemini 3.7 Flash

Gemini 3.1 Pro Preview (Google) and Gemini 3.7 Flash (Google) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 17 August 2026

As of 17 August 2026, Gemini 3.1 Pro Preview holds the stronger ModelCap Index position (#7 vs #14); and Gemini 3.7 Flash is 6.4× cheaper per output token ($1.88/1M vs $12.00/1M).

Which should you choose?

Choose Gemini 3.1 Pro Preview if…

  • you want the stronger overall ModelCap Index position — #7 against #14 (78.2 vs 73.1 points).

Choose Gemini 3.7 Flash if…

  • API cost matters — $1.88/1M output tokens against $12.00/1M, about 6.4× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.375/1M against $2.00/1M.
  • LMArena Agent is your yardstick — 3.6% against -0.4%.
  • Artificial Analysis Intelligence Index is your yardstick — 56.0 against 47.7.
  • you want the more recently listed model — Gemini 3.7 Flash was listed 13 August 2026, Gemini 3.1 Pro Preview 19 February 2026.

Gemini 3.1 Pro Preview vs Gemini 3.7 Flash: specs, pricing and context

Specification comparison of Gemini 3.1 Pro Preview and Gemini 3.7 Flash
FieldGemini 3.1 Pro PreviewGoogleGemini 3.7 FlashGoogle
ModelCap Index position#7#14
Index score78.273.1
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$0.375
Output price / 1M tokens$12.00$1.88
Context window1M tokens1M tokens
Max output tokens66K66K
API providers listed22
Weight accessAPI onlyAPI only
Input modalitiesAudio, File, Image, Text, VideoText, Image, Video, File, Audio
First listed19 February 202613 August 2026
PublisherGoogleGoogle

Evidence: 4 public benchmark observations across 4 boards · 2 public benchmark observations across 2 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Gemini 3.1 Pro Preview vs Gemini 3.7 Flash

Public benchmark boards where Gemini 3.1 Pro Preview or Gemini 3.7 Flash has a published result
BoardGemini 3.1 Pro PreviewGemini 3.7 FlashLeads
Arena codingArena (LMArena)15211516–1526—Only one result
LMArena AgentLMArena-0.4%-1.2%–0.3%3.6%2.4%–4.8%HighGemini 3.7 Flash
Artificial Analysis Intelligence IndexArtificial Analysis47.7intelligence-index56.0intelligence-indexGemini 3.7 Flash

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

Gemini 3.1 Pro Preview vs Gemini 3.7 Flash: common questions

Is Gemini 3.1 Pro Preview better than Gemini 3.7 Flash?

Gemini 3.1 Pro Preview ranks higher on the ModelCap Index as of 17 August 2026: #7 against #14. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is Gemini 3.1 Pro Preview cheaper than Gemini 3.7 Flash?

Gemini 3.7 Flash is cheaper on output tokens: $1.88/1M against $12.00/1M. Input tokens are $2.00/1M for Gemini 3.1 Pro Preview and $0.375/1M for Gemini 3.7 Flash. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Gemini 3.1 Pro Preview or Gemini 3.7 Flash?

Both publish a 1M-token context window.

Which is better for coding, Gemini 3.1 Pro Preview or Gemini 3.7 Flash?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are Gemini 3.1 Pro Preview and Gemini 3.7 Flash open-weight models?

Gemini 3.1 Pro Preview: API only. Gemini 3.7 Flash: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run Gemini 3.1 Pro Preview and Gemini 3.7 Flash?

ModelCap currently lists 2 API providers for Gemini 3.1 Pro Preview and 2 for Gemini 3.7 Flash, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Gemini 3.1 Pro Preview vs Gemini 3.7 Flash comparison?

Every figure comes from the sealed ModelCap dataset published 17 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

Explore further