Gemini 2.5 Pro vs Gemini 3.5 Flash
Gemini 3.5 Flash is cheaper on output tokens. Choose Gemini 2.5 Pro or Gemini 3.5 Flash based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Gemini 2.5 Pro | Gemini 3.5 Flash |
|---|---|---|
| Provider | ||
| Input / 1M tokens | $1.25 | $1.50 |
| Output / 1M tokens | $10.00 | $9.00 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Jun 2025 | May 2026 |
| LMArena (Chatbot Arena) Elo score | 1458 | 1482 |
| LMArena WebDev Elo score | 1226 | 1499 |
| LMArena Vision Elo score | 1263 | 1310 |
| LiveBench score | — | 75.8 |
| GPQA Diamond score | — | 92.8 |
| FrontierMath score | — | 39.0 |
| Epoch Capabilities Index score | — | 154 |
FAQ
Is Gemini 2.5 Pro or Gemini 3.5 Flash cheaper?
Gemini 3.5 Flash is cheaper on output tokens ($9.00 vs $10.00 per 1M).
Which has the larger context window, Gemini 2.5 Pro or Gemini 3.5 Flash?
Both models offer a similar context window.
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.