Model comparison
Gemini 2.5 Flash vs Gemini 1.5 Flash
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 Flash
Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks.
Gemini 1.5 Flash
Fast Gemini model balancing multimodal reasoning, tool use, and cost.
Price history
Prices side by side, day by day
- Gemini 2.5 Flash
- Gemini 1.5 Flash No price history checked yet
- Gemini 2.5 Flash
- Gemini 1.5 Flash No price history checked yet
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 Flash | Gemini 1.5 Flash |
|---|---|---|
| Input price | $0.300 per million tokens | Not checked yet |
| Output price | $2.50 per million tokens | Not checked yet |
Scores
Benchmarks, with source and date
| Measure | Gemini 2.5 Flash | Gemini 1.5 Flash |
|---|---|---|
| Artificial Analysis Intelligence Index | 15.5 | Not checked yet |
| LMArena text rating (Elo) | 1,417 | Not checked yet |
| LMArena vision rating (Elo) | 1,235 | Not checked yet |
| Design Arena rating (Elo) | 1,132 | Not checked yet |
Specs
Context, modalities and tool use
| Measure | Gemini 2.5 Flash | Gemini 1.5 Flash |
|---|---|---|
| Context window | 1,048,576 tokens | Not checked yet |
| Reads | Files, Images, Text, Audio, Video | Not checked yet |
| Writes | Text | Not checked yet |
| Tool calling | Yes | Not checked yet |
| Reasoning mode | Yes | Not checked yet |
| Open weights | No | Not checked yet |
| Listed since | 17 June 2025 | Not checked yet |
Usage
How much each one is used
| Measure | Gemini 2.5 Flash | Gemini 1.5 Flash |
|---|---|---|
| Tokens served on OpenRouter in a day | 40.4B (for 10 Nov 2026) | Not checked yet |
| Requests on OpenRouter in a day | 14.3M (for 10 Nov 2026) | Not checked yet |
| Tool calls on OpenRouter in a day | 374.2K (for 10 Nov 2026) | Not checked yet |
| Token usage, last 7 days | Down 1% on the week before (for 10 Nov 2026) | Not checked yet |
- Gemini 2.5 Flash
- Gemini 1.5 Flash No usage checked yet
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.