Gemini 3.1 Flash-Lite vs Gemini 2.5 Flash
Two Gemini models priced within a nickel of each other, a generation apart.
Side by side
| Attribute | Gemini 3.1 Flash-Lite | Gemini 2.5 Flash |
|---|---|---|
| Input, per 1M tokens | $0.25 | $0.30 |
| Output, per 1M tokens | $1.50 | $2.50 |
| Context window | 1,000,000 | 1,000,000 |
| Provider | ||
| Tokenizer | Google tokenizer | Google tokenizer |
| Long-context tier | none | none |
| Retires | no date announced | no date announced |
Which to choose
- Reading more than you write
- Gemini 3.1 Flash-Lite $0.25 against Gemini 2.5 Flash $0.30 per million input tokens — near-parity of 1.2x.
- Writing more than you read
- Gemini 3.1 Flash-Lite prices output at 6x its input rate, Gemini 2.5 Flash at 8.3x — so Gemini 3.1 Flash-Lite's lead widens as answers lengthen.
- 10,000 in, 1,000 out
- $0.004 on Gemini 3.1 Flash-Lite, $0.0055 on Gemini 2.5 Flash. Over 10,000 such calls that is $15.00 in Gemini 3.1 Flash-Lite's favour.
What this page does not tell you. Which model produces better answers. That depends on your task, and this site has no benchmark data — everything above is drawn from published pricing and specifications. Compare quality by running your own prompts through both.