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Gemini 3.1 Pro vs GLM-5.2 — Price, Context, and Capability Compared

Verdict

Gemini 3.1 Pro costs 2.1× more per blended million tokens than GLM-5.2. Gemini 3.1 Pro has the larger context window (2,000,000 tokens). Default to GLM-5.2 unless you specifically need Gemini 3.1 Pro's edge.

Spec comparison

Gemini 3.1 ProGLM-5.2
Price (input)$2.00/M$1.40/M
Price (output)$12.00/M$4.40/M
Blended price$4.50/M$2.15/M
Context window2,000,000 tokens1,000,000 tokens
Max output64,000 tokens64,000 tokens
Modalitiestext, vision, audiotext
Reasoning modeYesYes
Released2026-022026-05
Speed55 t/sNot measured

Cost at scale (3:1 blended)

Tokens / monthGemini 3.1 ProGLM-5.2Delta
1,000,000$4.50$2.15$2.35 (2.1×)
10,000,000$45.00$21.50$23.50 (2.1×)
100,000,000$450.00$215.00$235.00 (2.1×)

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 GLM-5.2 if…

  • Open-weights coding-first flagship
  • 1M-token context window
  • Beats larger frontier models on long-horizon coding
  • Long-horizon coding on open weights at a fraction of frontier pricing.

Run this exact matchup right now

Send the same prompt to Gemini 3.1 Pro and GLM-5.2 side by side and see the outputs yourself.

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FAQ

Is Gemini 3.1 Pro cheaper than GLM-5.2?

GLM-5.2 is cheaper, at $2.15 per million blended tokens vs $4.50 for Gemini 3.1 Pro.

Which has the bigger context window, Gemini 3.1 Pro or GLM-5.2?

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

Can Gemini 3.1 Pro replace GLM-5.2 for coding?

Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs Open-weights coding-first flagship (GLM-5.2) — pick based on which strength matters more for your workload.

Related

Gemini 3.1 Pro pricingGLM-5.2 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.