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Gemini 3.1 Pro vs Grok 4.3

Grok 4.3 is not currently in the Allocate serving catalog, so this page lists no prices for it: every price on this site comes from the live catalog.

Gemini 3.1 Pro Grok 4.3
LabGooglexAI
AccessAPI onlyNot served on Allocate
Context window1M tokensn/a
List price, input$2 / M tokensNot served
List price, output$12 / M tokensNot served
Cached inputn/an/a
LicenseProprietary APIProprietary API
Fine-tunableNoNo

Specifications and provider list prices from the Allocate catalog, checked 2026-07-08. Billed price is list plus the 7% transaction fee.

Choose Gemini 3.1 Pro for

  • Judgment-heavy workflows
  • Long-context analysis
  • Escalation tier above Flash
Gemini 3.1 Pro details

Choose Grok 4.3 for

  • Freshness-sensitive answers
  • Fast reasoning turns
  • Research assistants
Grok 4.3 details

Common questions

Which has the bigger context window?

Gemini 3.1 Pro: 1,000,000 tokens (1M) against an unlisted window for Grok 4.3.

Can I fine-tune Gemini 3.1 Pro or Grok 4.3?

No. Both are closed models served over API. If you want a model you can train and own, start from an open-weights base in the catalog.

Related comparisons

Gemini 3.1 Pro vs Gemini 3.5 FlashGrok 4.3 vs Gemini 3.5 FlashGemini 3.1 Pro vs Meta Llama 3.1 405B InstructGrok 4.3 vs Meta Llama 3.1 405B InstructGemini 3.1 Pro vs GLM 5.2Grok 4.3 vs GLM 5.2

Run the numbers on your workload

LLM price comparisonAgent cost calculatorGemini 3.1 ProGrok 4.3

Or don’t choose. On Allocate a route name is the contract: point yours at one model today, swap to the other tomorrow, and compare them on your live traffic with per-token metering.

Route both modelsTalk to sales