TokenSave
All comparisons · Prices checked 2026-10-01
Gemini 4 Argon vs Gemini 3.1 Pro: API cost comparison
For a typical chatbot reply, Gemini 4 Argon costs $0.013 and Gemini 3.1 Pro costs $0.0074 per request: Gemini 3.1 Pro is 1.8× cheaper. Gemini 3.1 Pro is cheaper in every workload below.
API prices
| Gemini 4 Argon | Gemini 3.1 Pro | |
|---|---|---|
| Maker | ||
| Input / 1M tokens | $4 | $2 |
| Output / 1M tokens | $20 | $12 |
| Output vs input price | 5.0× | 6.0× |
| Context window | 1M tokens | 1.05M tokens |
| Tokens for the same English text | ~95% of GPT's count (estimate) | ~95% of GPT's count (estimate) |
Cost by workload
| Workload (per 1,000 requests) | Gemini 4 Argon | Gemini 3.1 Pro | Cheaper |
|---|---|---|---|
| Chatbot reply short question plus some chat history · 1,500 in / 400 out | $13.30 | $7.41 | Gemini 3.1 Pro 1.8× cheaper |
| Document Q&A (RAG) retrieved passages plus a question · 8,000 in / 500 out | $39.90 | $20.90 | Gemini 3.1 Pro 1.9× cheaper |
| Coding agent step large working context, short edit · 25,000 in / 800 out | $110 | $56.62 | Gemini 3.1 Pro 1.9× cheaper |
| Summarize a long report long input, short summary · 20,000 in / 300 out | $81.70 | $41.42 | Gemini 3.1 Pro 2.0× cheaper |
| Write an article short brief, long draft · 800 in / 2,000 out | $41.04 | $24.32 | Gemini 3.1 Pro 1.7× cheaper |
Gemini 3.1 Pro is cheaper on both input and output, so it costs less for every kind of request. The gap is 2.0× on input and 1.7× on output.
Monthly cost
| Monthly volume | Gemini 4 Argon | Gemini 3.1 Pro |
|---|---|---|
| 10,000 chatbot replies / month | $133 | $74.10 |
| 100,000 chatbot replies / month | $1,330 | $741 |
| 1,000,000 chatbot replies / month | $13,300 | $7,410 |
Calculate your own
Enter your typical request size and volume.
Token counts are for English text measured with GPT's tokenizer; each model's own tokenizer difference is applied automatically.
Questions
Which is cheaper, Gemini 4 Argon or Gemini 3.1 Pro?
For a typical chatbot reply (1,500 input and 400 output tokens), Gemini 4 Argon costs $0.013 and Gemini 3.1 Pro costs $0.0074 per request, so Gemini 3.1 Pro is 1.8× cheaper. Gemini 3.1 Pro is cheaper in every workload below.
How much do Gemini 4 Argon and Gemini 3.1 Pro cost per million tokens?
Gemini 4 Argon costs $4 per 1M input tokens and $20 per 1M output tokens. Gemini 3.1 Pro costs $2 input and $12 output. Prices checked 2026-10-01.
Do both models count the same text as the same number of tokens?
No. Each model family has its own tokenizer, so the same text can be a different number of tokens. The costs on this page already include that difference (estimated from GPT's tokenizer).
Related comparisons
- GPT-6 Astra vs Gemini 4 Argon
- Gemini 4 Argon vs Claude Opus 5.5
- Gemini 4 Argon vs Claude Fable 5.1
- Gemini 3.1 Pro vs GPT-6 Sol
- Gemini 3.1 Pro vs Claude Sonnet 5.5
Paste a real prompt to see its exact tokens and cost on Gemini 4 Argon, Gemini 3.1 Pro and 30+ other models.
Open the token counter →Standard API list prices, short-context tier, no caching or batch discounts. Prices change; check each provider's pricing page before large jobs.