Gemini 2.5 Pro vs Gemini 3.5 Flash
Google vs Google — benchmarks, pricing, and capabilities side by side.
- •Gemini 3.5 Flash has the higher intelligence index (92.2 vs 71.6)
- •Gemini 2.5 Pro is cheaper ($1.25 vs $1.50 per 1M input)
- •Gemini 3.5 Flash is faster
| Gemini 2.5 Pro | Gemini 3.5 Flash | |
|---|---|---|
| Intelligence index | 71.6 | 92.2 |
| Developer | ||
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Input price | $1.25 / 1M | $1.50 / 1M |
| Output price | $10.00 / 1M | $9.00 / 1M |
| Speed | 85 tok/s | 221 tok/s |
| Released | March 25, 2025 | May 19, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image, Audio, Video | Text, Image, Audio, Video |
| Output modalities | Text | Text |
Shared benchmarks
Gemini 2.5 Pro
Gemini 3.5 Flash
GPQA Diamond
84
92.2
Humanity’s Last Exam
17.8
41