Gemini 3.1 Flash-Lite vs Gemini 3.1 Pro Preview: API cost
Standard, cached and batch API prices for Gemini 3.1 Flash-Lite (Google) and Gemini 3.1 Pro Preview (Google), and what each costs for your usage.
Gemini 3.1 Flash-Lite is cheaper than Gemini 3.1 Pro Preview at standard rates, with 8× cheaper input and 8× cheaper output.
- Input $7.50
- Cached input $0.75
- Output $13.50
- Input $60.00
- Cached input $6.00
- Output $108.00
Show as a table
| Output tokens | Gemini 3.1 Flash-Lite | Gemini 3.1 Pro Preview |
|---|---|---|
| 0 | $0.25 | $2.00 |
| 250 | $0.63 | $5.00 |
| 500 | $1.00 | $8.00 |
| 750 | $1.38 | $11.00 |
| 1,000 | $1.75 | $14.00 |
| Token type | Gemini 3.1 Flash-Lite | Gemini 3.1 Pro Preview | |
|---|---|---|---|
| Input | $0.25 | $2 | Gemini 3.1 Flash-Lite is 8× cheaper |
| Cached input | $0.025 | $0.20 | Gemini 3.1 Flash-Lite is 8× cheaper |
| Output | $1.50 | $12 | Gemini 3.1 Flash-Lite is 8× cheaper |
| Batch input | $0.125 | $1 | Gemini 3.1 Flash-Lite is 8× cheaper |
| Batch cached input | $0.0125 | $0.20 | Gemini 3.1 Flash-Lite is 16× cheaper |
| Batch output | $0.75 | $6 | Gemini 3.1 Flash-Lite is 8× cheaper |
Gemini 3.1 Flash-Lite: Audio input costs more.
Gemini 3.1 Pro Preview: Prompts over 200K tokens are billed at a higher rate.
| Workload | Gemini 3.1 Flash-Lite | Gemini 3.1 Pro Preview |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $21.75 | $174.00 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $22.20 | $177.60 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $78.00 | $624.00 |
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Or see Gemini 3.1 Flash-Lite pricing, Gemini 3.1 Pro Preview pricing, or compare any two models.
FAQ
Frequently asked questions
Is Gemini 3.1 Flash-Lite cheaper than Gemini 3.1 Pro Preview?
Gemini 3.1 Flash-Lite is cheaper than Gemini 3.1 Pro Preview at standard rates, with 8× cheaper input and 8× cheaper output. Based on standard API rates last checked on 30 Sept 2026.
How much do Gemini 3.1 Flash-Lite and Gemini 3.1 Pro Preview cost per million tokens?
Gemini 3.1 Flash-Lite: $0.25 per million input tokens and $1.50 per million output tokens. Gemini 3.1 Pro Preview: $2 input and $12 output. These are standard rates in USD, before tax, from each provider’s own pricing page.
Which is cheaper with the Batch API?
Gemini 3.1 Flash-Lite’s batch rates are $0.125 input and $0.75 output per million tokens (50% off); Gemini 3.1 Pro Preview’s batch rates are $1 input and $6 output per million tokens (50% off).
Does prompt caching change the comparison?
Gemini 3.1 Flash-Lite charges $0.025 per million cached input tokens, against $0.25 for normal input; Gemini 3.1 Pro Preview charges $0.20 per million cached input tokens, against $2 for normal input. Cache write and storage charges are extra and aren’t included here.