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Gemini 3.1 Pro vs Gemini 3.6 Flash — Price, Context, and Capability Compared

Verdict

Gemini 3.1 Pro costs 1.3× more per blended million tokens than Gemini 3.6 Flash. Gemini 3.1 Pro has the larger context window (2,000,000 tokens). Default to Gemini 3.6 Flash unless you specifically need Gemini 3.1 Pro's edge.

Spec comparison

Gemini 3.1 ProGemini 3.6 Flash
Price (input)$2.00/M$1.50/M
Price (output)$12.00/M$9.00/M
Blended price$4.50/M$3.38/M
Context window2,000,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, vision, audiotext, vision, audio
Reasoning modeYesYes
Released2026-022026-06
Speed55 t/s114 t/s

Cost at scale (3:1 blended)

Tokens / monthGemini 3.1 ProGemini 3.6 FlashDelta
1,000,000$4.50$3.38$1.13 (1.3×)
10,000,000$45.00$33.75$11.25 (1.3×)
100,000,000$450.00$337.50$112.50 (1.3×)

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 Gemini 3.6 Flash if…

  • Faster than Gemini 3.5 Flash
  • Top-tier coding and agentic performance for its price
  • 1M-token context
  • Latency-sensitive coding and agentic tasks that still need a huge context window.

Run this exact matchup right now

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FAQ

Is Gemini 3.1 Pro cheaper than Gemini 3.6 Flash?

Gemini 3.6 Flash is cheaper, at $3.38 per million blended tokens vs $4.50 for Gemini 3.1 Pro.

Which has the bigger context window, Gemini 3.1 Pro or Gemini 3.6 Flash?

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

Can Gemini 3.1 Pro replace Gemini 3.6 Flash for coding?

Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs Faster than Gemini 3.5 Flash (Gemini 3.6 Flash) — pick based on which strength matters more for your workload.

Which is faster, Gemini 3.1 Pro or Gemini 3.6 Flash?

Gemini 3.6 Flash is faster: 114 t/s vs 55 t/s, measured on our speed benchmarks.

Related

Gemini 3.1 Pro pricingGemini 3.6 Flash pricingvs Claude Opus 4.8vs Grok 4.3vs GPT-5.6 Terravs Claude Sonnet 4.6Premium model tests

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