Gemini 3 Flash Preview vs Gemini 2.5 Pro: API cost
Standard, cached and batch API prices for Gemini 3 Flash Preview (Google) and Gemini 2.5 Pro (Google), and what each costs for your usage.
Gemini 3 Flash Preview is cheaper than Gemini 2.5 Pro at standard rates, with 2.5× cheaper input and 3.3× cheaper output.
- Input $15.00
- Cached input $1.50
- Output $27.00
- Input $37.50
- Cached input $3.75
- Output $90.00
Show as a table
| Output tokens | Gemini 3 Flash Preview | Gemini 2.5 Pro |
|---|---|---|
| 0 | $0.5 | $1.25 |
| 250 | $1.25 | $3.75 |
| 500 | $2.00 | $6.25 |
| 750 | $2.75 | $8.75 |
| 1,000 | $3.50 | $11.25 |
| Token type | Gemini 3 Flash Preview | Gemini 2.5 Pro | |
|---|---|---|---|
| Input | $0.50 | $1.25 | Gemini 3 Flash Preview is 2.5× cheaper |
| Cached input | $0.05 | $0.125 | Gemini 3 Flash Preview is 2.5× cheaper |
| Output | $3 | $10 | Gemini 3 Flash Preview is 3.3× cheaper |
| Batch input | $0.25 | $0.625 | Gemini 3 Flash Preview is 2.5× cheaper |
| Batch cached input | $0.05 | $0.125 | Gemini 3 Flash Preview is 2.5× cheaper |
| Batch output | $1.50 | $5 | Gemini 3 Flash Preview is 3.3× cheaper |
Gemini 3 Flash Preview: Audio input costs more.
Gemini 2.5 Pro: Prompts over 200K tokens are billed at a higher rate.
| Workload | Gemini 3 Flash Preview | Gemini 2.5 Pro |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $43.50 | $131.25 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $44.40 | $123.00 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $156.00 | $420.00 |
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Or see Gemini 3 Flash Preview pricing, Gemini 2.5 Pro pricing, or compare any two models.
FAQ
Frequently asked questions
Is Gemini 3 Flash Preview cheaper than Gemini 2.5 Pro?
Gemini 3 Flash Preview is cheaper than Gemini 2.5 Pro at standard rates, with 2.5× cheaper input and 3.3× cheaper output. Based on standard API rates last checked on 30 Sept 2026.
How much do Gemini 3 Flash Preview and Gemini 2.5 Pro cost per million tokens?
Gemini 3 Flash Preview: $0.50 per million input tokens and $3 per million output tokens. Gemini 2.5 Pro: $1.25 input and $10 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 Flash Preview’s batch rates are $0.25 input and $1.50 output per million tokens (50% off); Gemini 2.5 Pro’s batch rates are $0.625 input and $5 output per million tokens (50% off).
Does prompt caching change the comparison?
Gemini 3 Flash Preview charges $0.05 per million cached input tokens, against $0.50 for normal input; Gemini 2.5 Pro charges $0.125 per million cached input tokens, against $1.25 for normal input. Cache write and storage charges are extra and aren’t included here.