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Gemini 3.1 Pro vs Grok 4.3 — Price, Context, and Capability Compared

Verdict

Gemini 3.1 Pro costs 2.9× more per blended million tokens than Grok 4.3. Gemini 3.1 Pro has the larger context window (2,000,000 tokens). Default to Grok 4.3 unless you specifically need Gemini 3.1 Pro's edge.

Spec comparison

Gemini 3.1 ProGrok 4.3
Price (input)$2.00/M$1.25/M
Price (output)$12.00/M$2.50/M
Blended price$4.50/M$1.56/M
Context window2,000,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, vision, audiotext, vision
Reasoning modeYesYes
Released2026-022026-06
Speed55 t/s98 t/s

Cost at scale (3:1 blended)

Tokens / monthGemini 3.1 ProGrok 4.3Delta
1,000,000$4.50$1.56$2.94 (2.9×)
10,000,000$45.00$15.63$29.38 (2.9×)
100,000,000$450.00$156.25$293.75 (2.9×)

Choose Gemini 3.1 Pro if…

  • Largest context window of any current model (2M tokens)
  • Native audio and video understanding
  • Google Search grounding
  • Whole-codebase, whole-document, or long-video analysis in a single request.

Choose Grok 4.3 if…

  • xAI’s general-purpose flagship
  • Extremely fast for its size
  • 1M-token context
  • General-purpose work where speed and a huge context window both matter.

Run this exact matchup right now

Send the same prompt to Gemini 3.1 Pro and Grok 4.3 side by side and see the outputs yourself.

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FAQ

Is Gemini 3.1 Pro cheaper than Grok 4.3?

Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $4.50 for Gemini 3.1 Pro.

Which has the bigger context window, Gemini 3.1 Pro or Grok 4.3?

Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 1,000,000.

Can Gemini 3.1 Pro replace Grok 4.3 for coding?

Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.

Which is faster, Gemini 3.1 Pro or Grok 4.3?

Grok 4.3 is faster: 98 t/s vs 55 t/s, measured on our speed benchmarks.

Related

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Pricing verified 2026-04-06. Specs verified 2026-08-08.