Gemini 4 Argon vs Gemini 3.1 Pro (preview): API cost comparison
For a typical chatbot (1,500 input + 400 output tokens, 100,000 requests a month), Gemini 4 Argon is 10% cheaper: $715 vs $795 for Gemini 3.1 Pro (preview). Paste your own prompt below to compare the exact cost of your workload.
0 characters0 words0 tokens (GPT o200k)
| Model | Per month |
|---|---|
| Gemini 4 Argon | |
| Gemini 3.1 Pro (preview) |
≈ = estimated token count: only OpenAI publishes its tokenizer. Claude counts use Anthropic’s published ratios; use the count_tokens API for an exact number.
Price per million tokens
USD, standard tier. Prices checked on October 28, 2026.
| Gemini 4 Argon | Gemini 3.1 Pro (preview) | |
|---|---|---|
| Input | $2 | $2 |
| Output | $10 | $12 |
| Cached input | $0.1 | $0.2 |
| Cache write (5 min) | Not charged separately | Not charged separately |
| Long prompts | Same price at any length | Above 200K tokens: $4 / $18 |
| Batch API | 50% off | 50% off |
| Provider | Google (Gemini) | Google (Gemini) |
Gemini 4 Argon: Launch price through November 30, 2026; $4 / $20 from December 1, 2026.
Monthly cost for common workloads
| Workload | Gemini 4 Argon | Gemini 3.1 Pro (preview) |
|---|---|---|
| Chatbot 1,500 input + 400 output tokens, 100,000 requests a month | $715 | $795 |
| Document Q&A (RAG) 8,000 input + 500 output tokens, half the input cached, 20,000 requests a month | $276 | $305 |
| Long-document summary 150,000 input + 2,000 output tokens, 1,000 requests a month | $335 | $339 |
| Bulk classification (Batch API) 500 input + 20 output tokens, 1 million requests a month, Batch API where available | $625 | $645 |
Token counts are converted per model: the same text becomes a different number of tokens on each provider (see below). The cheaper option in each row is highlighted.
Frequently asked questions
Is Gemini 4 Argon cheaper than Gemini 3.1 Pro (preview)?
Per million tokens, Gemini 4 Argon costs $2 / $10 (input / output) and Gemini 3.1 Pro (preview) costs $2 / $12. For a typical chatbot workload (1,500 input + 400 output tokens, 100,000 requests a month), Gemini 4 Argon is 10% cheaper: $715 vs $795 for Gemini 3.1 Pro (preview). Token counts differ between providers, so compare the cost of the same prompt rather than the price per token.
How much do Gemini 4 Argon and Gemini 3.1 Pro (preview) cost per million tokens?
Gemini 4 Argon: $2 / $10 for input / output, $0.1 for cached input. Gemini 3.1 Pro (preview): $2 / $12, $0.2 for cached input. Prices in US dollars, standard tier, checked on October 28, 2026.
Do Gemini 4 Argon and Gemini 3.1 Pro (preview) count tokens the same way?
Gemini 4 Argon's tokenizer is not published. We estimate about 1.05× the GPT o200k count for the same text. Gemini 3.1 Pro (preview)'s tokenizer is not published. We estimate about 1.05× the GPT o200k count for the same text.
Do Gemini 4 Argon and Gemini 3.1 Pro (preview) have a Batch API discount?
Both do: Gemini 4 Argon gets 50% off and Gemini 3.1 Pro (preview) 50% off for requests sent through the Batch API, which may take up to 24 hours.
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