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Gemini 3.1 Pro vs Gemini 4 Argon: price
Gemini 4 Argon is 1.1× cheaper than Gemini 3.1 Pro for a typical chat (1,500 tokens in, 500 out).
| Item | Gemini 3.1 Pro | Gemini 4 Argon |
|---|---|---|
| Input per 1M tokens | $2.00 | $2.00 |
| Output per 1M tokens | $12.00 | $10.00 |
| Cached input per 1M | $0.20 | $0.10 |
| 1,000 chat messages1,500 tokens in, 500 out each | $9.00 | $8.00 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.072 | $0.07 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.168 | $0.16 |
Gemini 4 Argon: Introductory price through Nov 30, 2026; $4 in / $20 out (cache $0.20) from Dec 1, 2026. Context limit is shared between input and output.
List prices checked November 5, 2026. Price is half the story: see how people rate each one today.
Gemini 3.1 Pro vs Gemini 4 Argon in numbers
Output, usually the bigger part of the bill, costs $12.00 on Gemini 3.1 Pro and $10.00 on Gemini 4 Argon, so Gemini 4 Argon is 1.2× cheaper there. Input costs the same, $2.00 per million tokens. For a coding-agent task (60,000 tokens in, 4,000 out) that is $0.168 on Gemini 3.1 Pro and $0.16 on Gemini 4 Argon. Both accept up to 1.05M tokens of context. Gemini 3.1 Pro came out on February 19, 2026 and Gemini 4 Argon on October 13, 2026.
Both are Google models. Estimate your own bill for both in the cost calculator.
Which one feels dumber today?
- Gemini 3.1 ProGoogle
–no votes yet - Gemini 4 ArgonGoogle–no votes yet
Frequently asked questions
Is Gemini 3.1 Pro or Gemini 4 Argon cheaper?
Gemini 4 Argon is 1.1× cheaper than Gemini 3.1 Pro for a typical chat (1,500 tokens in, 500 out). Output, usually the bigger part of the bill, costs $12.00 on Gemini 3.1 Pro and $10.00 on Gemini 4 Argon, so Gemini 4 Argon is 1.2× cheaper there.
Which is better, Gemini 3.1 Pro or Gemini 4 Argon?
It depends on the task, and price is only part of it. Check how people rate each one today on the Gemini 3.1 Pro and Gemini 4 Argon pages, and read what users report in Discussions.