Gemini 3.1 Pro Custom Tools vs Gemini 3.5 Flash
Google vs Google — benchmarks, pricing, and capabilities side by side.
- •Gemini 3.5 Flash is cheaper ($1.50 vs $2.00 per 1M input)
- •Gemini 3.1 Pro Custom Tools has a larger context window (1M)
| Gemini 3.1 Pro Custom Tools | Gemini 3.5 Flash | |
|---|---|---|
| Intelligence index | — | 92.2 |
| Developer | ||
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,048,756 tokens | 1,048,576 tokens |
| Input price | $2.00 / 1M | $1.50 / 1M |
| Output price | $12.00 / 1M | $9.00 / 1M |
| Speed | — | 221 tok/s |
| Released | February 25, 2026 | May 19, 2026 |
| Parameters | — | — |
| Input modalities | Text, Audio, Image, Video | Text, Image, Audio, Video |
| Output modalities | Text | Text |