Standard Compute
Model comparison 2026

Gemini 3.1 Pro vs Gemini 4 Argon

Gemini 3.1 Pro
Google · Frontier · Proprietary
$5.00/1M · 1.0M ctx
Gemini 4 Argon
Google · Frontier · Proprietary
$4.40/1M · 1.0M ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
Gemini 3.1 Pro
Gemini 4 Argon
Maker
Google
Google
Blended price / 1M
$5.00
$4.40
Input / output
$2.00 in · $12 out / 1M tokens
$2.00 in · $10 out / 1M tokens
Context window
1.0M
1.0M
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
6.4
9.3
Agentic Ability
5.2
9.4
Speed
8.5
7.5
Value for money
4.3
5.4
Reliability
8.5
9.2

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Gemini 3.1 Pro or Gemini 4 Argon?

Updated 2026-10-13

Choose Gemini 3.1 Pro if you want long multimodal inputs and Gemini CLI setups that still pin 3.1 Pro. Choose Gemini 4 Argon if you want hard coding and agent steps where you want a frontier model outside the Claude and GPT families.

In our editorial scoring, Gemini 4 Argon leads in 4 of five dimensions (output quality, agentic ability, value for money and reliability), while Gemini 3.1 Pro leads in 1. On price, Gemini 3.1 Pro runs about $5.00 per 1M tokens (blended) and is proprietary; Gemini 4 Argon is about $4.40 and proprietary.

Where Gemini 3.1 Pro falls short
  • Gemini 3.8 Flash scores higher and costs about half as much per request
  • Prompts over 200K tokens bill at $4/$18 per million
Full Gemini 3.1 Pro breakdown →
Where Gemini 4 Argon falls short
  • Price doubles to $4/$20 per million on December 1, 2026
  • Not available on the Gemini API free tier or the Google AI Pro plan, per Google
Full Gemini 4 Argon breakdown →

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