Updated March 26, 2026· Based on independent benchmark data
Gemini 3.1 Pro Preview leads in intelligence with a score of 57.2 vs 46.4. Gemini 3 Flash Preview (Reasoning) is 4.0x cheaper at $0.50/1M tokens vs $2.00/1M. For speed, Gemini 3 Flash Preview (Reasoning) wins at 192 tok/s vs 113 tok/s.
| Metric | Gemini 3 Flash Preview (Reasoning) | Gemini 3.1 Pro Preview |
|---|---|---|
| Intelligence Score | 46.4 | 57.2 |
| Coding Score | 42.6 | 55.5 |
| Math Score | 97.0 | N/A |
| Speed (tok/s) | 192 tok/s | 113 tok/s |
| Latency (TTFT) | 6.11s | 23.84s |
| Input Price / 1M tokens | $0.50 | $2.00 |
| Output Price / 1M tokens | $3.00 | $12 |
| Context Window | N/A |
Gemini 3.1 Pro Preview outperforms Gemini 3 Flash Preview (Reasoning) on the intelligence index with a score of 57.2 compared to 46.4. For coding tasks, Gemini 3.1 Pro Preview has the edge with a coding score of 55.5 vs 42.6.
Gemini 3 Flash Preview (Reasoning) generates output significantly faster at 192 tok/s compared to Gemini 3.1 Pro Preview's 113 tok/s, making it 1.7x faster for streaming responses. Time to first token is 6.11s for Gemini 3 Flash Preview (Reasoning) vs 23.84s for Gemini 3.1 Pro Preview, which affects perceived responsiveness in interactive applications.
Gemini 3 Flash Preview (Reasoning) is more affordable at $0.50/1M 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 4.0x 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, Gemini 3 Flash Preview (Reasoning) would cost approximately $3.00/month vs $12.00/month for Gemini 3.1 Pro Preview in input costs alone.
Choose Gemini 3 Flash Preview (Reasoning) when you need faster output (192 tok/s), lower cost. Choose Gemini 3.1 Pro Preview when you need higher intelligence (57.2), stronger coding performance (55.5).
Gemini 3.1 Pro Preview scores higher on coding benchmarks (55.5 vs 42.6), making it the better choice for programming tasks.
Gemini 3 Flash Preview (Reasoning) is cheaper at $0.50/1M input tokens vs $2.00/1M for Gemini 3.1 Pro Preview.
Gemini 3 Flash Preview (Reasoning) is faster, producing output at 192 tok/s compared to Gemini 3.1 Pro Preview's 113 tok/s.
No, Gemini 3 Flash Preview (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 Gemini 3 Flash Preview (Reasoning) may be better for specific use cases like budget-conscious projects or speed-critical applications.