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Head-to-head comparison

Gemini 3.1 Pro Preview vs Grok 4.6

Gemini 3.1 Pro Preview (Google) and Grok 4.6 (xAI) 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 #10); Grok 4.6 is 2× cheaper per output token ($6.00/1M vs $12.00/1M); and Gemini 3.1 Pro Preview offers the longer context window (1M vs 500K tokens).

Which should you choose?

Choose Gemini 3.1 Pro Preview if…

  • you want the stronger overall ModelCap Index position — #7 against #10 (78.2 vs 74.4 points).
  • you need the longer context window — 1M tokens against 500K.
  • you want provider choice — 2 listed API providers against 1.
  • Arena coding is your yardstick — 1521 against 1512.

Choose Grok 4.6 if…

  • API cost matters — $6.00/1M output tokens against $12.00/1M, about 2× cheaper.
  • Artificial Analysis Intelligence Index is your yardstick — 60.9 against 47.7.
  • you want the more recently listed model — Grok 4.6 was listed 12 August 2026, Gemini 3.1 Pro Preview 19 February 2026.

Gemini 3.1 Pro Preview vs Grok 4.6: specs, pricing and context

Specification comparison of Gemini 3.1 Pro Preview and Grok 4.6
FieldGemini 3.1 Pro PreviewGoogleGrok 4.6xAI
ModelCap Index position#7#10
Index score78.274.4
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$2.00
Output price / 1M tokens$12.00$6.00
Context window1M tokens500K tokens
Max output tokens66K—
API providers listed21
Weight accessAPI onlyAPI only
Input modalitiesAudio, File, Image, Text, VideoText, Image, File
First listed19 February 202612 August 2026
PublisherGooglexAI

Evidence: 4 public benchmark observations across 4 boards · 5 public benchmark observations across 5 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Gemini 3.1 Pro Preview vs Grok 4.6

Public benchmark boards where Gemini 3.1 Pro Preview or Grok 4.6 has a published result
BoardGemini 3.1 Pro PreviewGrok 4.6Leads
Arena codingArena (LMArena)15211516–152615121485–1538HighGemini 3.1 Pro Preview
LMArena AgentLMArena-0.4%-1.2%–0.3%—Only one result
ARC-AGI-2ARC Prize Foundation—67.1%X-HighOnly one result
ARC-AGI-3ARC Prize Foundation—2.1%X-HighOnly one result
Artificial Analysis Intelligence IndexArtificial Analysis47.7intelligence-index60.9intelligence-indexGrok 4.6

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 Grok 4.6: common questions

Is Gemini 3.1 Pro Preview better than Grok 4.6?

Gemini 3.1 Pro Preview ranks higher on the ModelCap Index as of 17 August 2026: #7 against #10. 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 Grok 4.6?

Grok 4.6 is cheaper on output tokens: $6.00/1M against $12.00/1M. Input tokens are $2.00/1M for Gemini 3.1 Pro Preview and $2.00/1M for Grok 4.6. 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 Grok 4.6?

Gemini 3.1 Pro Preview has the larger context window: 1M tokens against 500K.

Which is better for coding, Gemini 3.1 Pro Preview or Grok 4.6?

Arena coding: Gemini 3.1 Pro Preview 1521, Grok 4.6 1512 — Gemini 3.1 Pro Preview leads.

Are Gemini 3.1 Pro Preview and Grok 4.6 open-weight models?

Gemini 3.1 Pro Preview: API only. Grok 4.6: 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 Grok 4.6?

ModelCap currently lists 2 API providers for Gemini 3.1 Pro Preview and 1 for Grok 4.6, 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 Grok 4.6 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.

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