Model comparison
Gemini 2.5 Pro vs Gemini 3 Flash Preview
Price history, scores and specs for both models, line by line. Every value shows where it came from and when we last confirmed it.
Gemini 2.5 Pro
Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks.
Gemini 3 Flash Preview
Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance.
Quick take
Where each one leads
- Gemini 3 Flash Preview costs less to send text to: $0.500 per million tokens, against $1.25 per million tokens for Gemini 2.5 Pro.
- Gemini 3 Flash Preview costs less per word it writes: $3.00 per million tokens, against $10.00 per million tokens for Gemini 2.5 Pro.
- Gemini 3 Flash Preview scores higher on the Artificial Analysis Intelligence Index: 26.3 to 16.1.
- More people run Gemini 3 Flash Preview through OpenRouter than Gemini 2.5 Pro right now.
Each line comes from a checked value in the tables below. Pick on your workload: price and usage matter for high volume, context and scores for long documents and agent loops.
Price history
Prices side by side, day by day
- Gemini 2.5 Pro
- Gemini 3 Flash Preview
- Gemini 2.5 Pro
- Gemini 3 Flash Preview
Prices are the listed OpenRouter base rates in US dollars. A day we could not confirm is left out of the line, never filled in.
Price
What each one costs now
| Measure | Gemini 2.5 Pro | Gemini 3 Flash Preview |
|---|---|---|
| Input price | $1.25 per million tokens | $0.500 per million tokens Leads |
| Output price | $10.00 per million tokens | $3.00 per million tokens Leads |
Scores
Benchmarks, with source and date
| Measure | Gemini 2.5 Pro | Gemini 3 Flash Preview |
|---|---|---|
| Artificial Analysis Intelligence Index | 16.1 | 26.3 Leads |
| Artificial Analysis Coding Index | 33.3 | Not checked yet |
| Artificial Analysis Agentic Index | 1.6 | Not checked yet |
| LMArena text rating (Elo) | 1,458 | Not checked yet |
| LMArena web development rating (Elo) | 1,228 | Not checked yet |
| LMArena vision rating (Elo) | 1,263 | Not checked yet |
| Design Arena rating (Elo) | 1,220 Leads | 1,192 |
Specs
Context, modalities and tool use
| Measure | Gemini 2.5 Pro | Gemini 3 Flash Preview |
|---|---|---|
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Reads | Text, Images, Files, Audio, Video | Text, Images, Files, Audio, Video |
| Writes | Text | Text |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Open weights | No | No |
| Listed since | 17 June 2025 | 17 Dec 2025 |
Usage
How much each one is used
| Measure | Gemini 2.5 Pro | Gemini 3 Flash Preview |
|---|---|---|
| Tokens served on OpenRouter in a day | 4.3B (for 10 Nov 2026) | 94.4B Leads (for 10 Nov 2026) |
| Requests on OpenRouter in a day | 486.9K (for 10 Nov 2026) | 11.9M Leads (for 10 Nov 2026) |
| Tool calls on OpenRouter in a day | 10.2K (for 10 Nov 2026) | 1.1M Leads (for 10 Nov 2026) |
| Token usage, last 7 days | Up 6% on the week before Leads (for 10 Nov 2026) | Down 0% on the week before (for 10 Nov 2026) |
- Gemini 2.5 Pro
- Gemini 3 Flash Preview
How this works
One link, either order
This link stays the same whichever order you name the two models in, so you can share it as it is. A line appears only when at least one model has a value we confirmed from a source; values we have not confirmed are left out, never guessed. To add a third record of any type, use the open comparison. Read how we check facts.