Updated March 26, 2026· Based on independent benchmark data
Gemini 3.1 Pro Preview leads in intelligence with a score of 57.2 vs 29.5. Gemini 2.5 Pro Preview (May' 25) is 1.6x cheaper at $1.25/1M tokens vs $2.00/1M. For speed, Gemini 3.1 Pro Preview wins at 113 tok/s vs 0 tok/s.
| Metric | Gemini 2.5 Pro Preview (May' 25) | Gemini 3.1 Pro Preview |
|---|---|---|
| Intelligence Score | 29.5 | 57.2 |
| Coding Score | N/A | 55.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 0 tok/s | 113 tok/s |
| Latency (TTFT) | 0.00s | 23.84s |
| Input Price / 1M tokens | $1.25 | $2.00 |
| Output Price / 1M tokens | $10 | $12 |
| Context Window | N/A |
Gemini 3.1 Pro Preview outperforms Gemini 2.5 Pro Preview (May' 25) on the intelligence index with a score of 57.2 compared to 29.5.
Gemini 3.1 Pro Preview generates output significantly faster at 113 tok/s compared to Gemini 2.5 Pro Preview (May' 25)'s 0 tok/s, making it Infinityx faster for streaming responses. Time to first token is 0.00s for Gemini 2.5 Pro Preview (May' 25) vs 23.84s for Gemini 3.1 Pro Preview, which affects perceived responsiveness in interactive applications.
Gemini 2.5 Pro Preview (May' 25) is more affordable at $1.25/1M input tokens ($10/1M output), while Gemini 3.1 Pro Preview costs $2.00/1M input ($12/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, Gemini 2.5 Pro Preview (May' 25) would cost approximately $7.50/month vs $12.00/month for Gemini 3.1 Pro Preview in input costs alone.
Choose Gemini 2.5 Pro Preview (May' 25) when you need lower cost. Choose Gemini 3.1 Pro Preview when you need higher intelligence (57.2), faster output (113 tok/s).
Gemini 2.5 Pro Preview (May' 25) is cheaper at $1.25/1M input tokens vs $2.00/1M for Gemini 3.1 Pro Preview.
Gemini 3.1 Pro Preview is faster, producing output at 113 tok/s compared to Gemini 2.5 Pro Preview (May' 25)'s 0 tok/s.
No, Gemini 2.5 Pro Preview (May' 25) does not support image input. However, Gemini 3.1 Pro Preview does support images.
It depends on your priorities. Gemini 3.1 Pro Preview scores higher on intelligence (57.2), but Gemini 2.5 Pro Preview (May' 25) may be better for specific use cases like budget-conscious projects or speed-critical applications.
Data last synced: March 26, 2026
| 1.0M |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Text | Audio + File + Image + Text + Video |
| Output Modalities | Text | Text |
| Free Tier | No | No |