Updated March 26, 2026· Based on independent benchmark data
Gemini 3.1 Pro Preview leads in intelligence with a score of 57.2 vs 46.8. Kimi K2.5 (Reasoning) is 3.3x cheaper at $0.60/1M tokens vs $2.00/1M. For speed, Gemini 3.1 Pro Preview wins at 113 tok/s vs 34 tok/s.
| Metric | Kimi K2.5 (Reasoning) | Gemini 3.1 Pro Preview |
|---|---|---|
| Intelligence Score | 46.8 | 57.2 |
| Coding Score | 39.5 | 55.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 34 tok/s | 113 tok/s |
| Latency (TTFT) | 1.40s | 23.84s |
| Input Price / 1M tokens | $0.60 | $2.00 |
| Output Price / 1M tokens | $3.00 | $12 |
| Context Window | N/A |
Gemini 3.1 Pro Preview outperforms Kimi K2.5 (Reasoning) on the intelligence index with a score of 57.2 compared to 46.8. For coding tasks, Gemini 3.1 Pro Preview has the edge with a coding score of 55.5 vs 39.5.
Gemini 3.1 Pro Preview generates output significantly faster at 113 tok/s compared to Kimi K2.5 (Reasoning)'s 34 tok/s, making it 3.3x faster for streaming responses. Time to first token is 1.40s for Kimi K2.5 (Reasoning) vs 23.84s for Gemini 3.1 Pro Preview, which affects perceived responsiveness in interactive applications.
Kimi K2.5 (Reasoning) is more affordable at $0.60/1M input tokens ($3.00/1M output), while Gemini 3.1 Pro Preview costs $2.00/1M input ($12/1M output). That makes Gemini 3.1 Pro Preview 3.3x more expensive per token, which can add up significantly at scale. For a typical workload of 100 requests per day at 2,000 tokens each, Kimi K2.5 (Reasoning) would cost approximately $3.60/month vs $12.00/month for Gemini 3.1 Pro Preview in input costs alone.
Choose Kimi K2.5 (Reasoning) when you need lower cost. Choose Gemini 3.1 Pro Preview when you need higher intelligence (57.2), stronger coding performance (55.5), faster output (113 tok/s).
Gemini 3.1 Pro Preview scores higher on coding benchmarks (55.5 vs 39.5), making it the better choice for programming tasks.
Kimi K2.5 (Reasoning) is cheaper at $0.60/1M 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 Kimi K2.5 (Reasoning)'s 34 tok/s.
No, Kimi K2.5 (Reasoning) does not support image input. However, Gemini 3.1 Pro Preview does support images.
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 |
It depends on your priorities. Gemini 3.1 Pro Preview scores higher on intelligence (57.2), but Kimi K2.5 (Reasoning) may be better for specific use cases like budget-conscious projects or speed-critical applications.