Comparison
Gemini 3.1 Pro Preview vs Gemini 3.5 Flash
Per input token, Gemini 3.5 Flash runs 25% cheaper than Gemini 3.1 Pro Preview. On generated (output) tokens, Gemini 3.1 Pro Preview costs 25% more than Gemini 3.5 Flash.
| Field | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
| Provider | ||
| Context window | — | 1M |
| Max output | — | 65.5K |
| Input / 1M | $2.00 | $1.5025% cheaper |
| Output / 1M | $12.00 | $9.0025% cheaper |
| Cached input / 1M | $0.20 | $0.1525% cheaper |
| Batch discount | 50% | 50% |
| Release date | — | — |
Worked cost examples
Estimated monthly cost on three common usage shapes
| Workload | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
Chatbot 800 input / 200 output tokens per request, 100,000 requests/month | $400.00 | $300.00cheaper |
RAG pipeline 6,000 input / 700 output tokens per request, 30,000 requests/month | $612.00 | $459.00cheaper |
Batch summarization 20,000 input / 1,500 output tokens per request, 5,000 requests/month | $290.00 | $217.50cheaper |
Gemini 3.1 Pro Preview vs Gemini 3.5 Flash FAQ
- Is Gemini 3.1 Pro Preview cheaper than Gemini 3.5 Flash?
- Gemini 3.1 Pro Preview costs $2.00 per 1M input tokens versus $1.50 for Gemini 3.5 Flash — Gemini 3.5 Flash is 33% cheaper per input token.
- Which is cheaper for output tokens, Gemini 3.1 Pro Preview or Gemini 3.5 Flash?
- Gemini 3.1 Pro Preview charges $12.00 per 1M output tokens; Gemini 3.5 Flash charges $9.00 per 1M output tokens.
- Do Gemini 3.1 Pro Preview and Gemini 3.5 Flash offer cache pricing?
- Gemini 3.1 Pro Preview discounts cached input to $0.20 per 1M tokens. Gemini 3.5 Flash discounts cached input to $0.15 per 1M tokens.
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