Gemini 3.5 Flash is cheaper than Gemini 3.1 Pro Preview at $1.5/M vs $2/M input tokens.
| Spec | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
| Input price | $2/M tokens | $1.5/M tokens |
| Output price | $12/M tokens | $9/M tokens |
| Context window | 1.0M tokens | 1.0M tokens |
| Released | Feb 2026 | May 2026 |
Not enough votes to call it. On the specs, nothing separates them.
Gemini 3.5 Flash wins Reasoning and Image Generation.
Gemini 3.5 Flash is cheaper on both — 1.3× input, 1.3× output
Gemini 3.1 Pro Preview uses 1.8x more hedging
Gemini 3.5 Flash is cheaper than Gemini 3.1 Pro Preview at $1.5/M vs $2/M input tokens.
| Spec | Gemini 3.1 Pro Preview | Gemini 3.5 Flash |
|---|---|---|
| Input price | $2/M tokens | $1.5/M tokens |
| Output price | $12/M tokens | $9/M tokens |
| Context window | 1.0M tokens | 1.0M tokens |
| Released | Feb 2026 | May 2026 |
Not enough votes to call it. On the specs, nothing separates them.
Gemini 3.5 Flash wins Reasoning and Image Generation.
Gemini 3.5 Flash is cheaper on both — 1.3× input, 1.3× output
Gemini 3.1 Pro Preview uses 1.8x more hedging