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 3.1 Pro Preview | Gemini 3 Flash Preview (Reasoning) |
|---|---|---|
| Intelligence Score | 57.2 | 46.4 |
| Coding Score | 55.5 | 42.6 |
| Math Score | N/A | 97.0 |
| Speed (tok/s) | 113 tok/s | 192 tok/s |
| Latency (TTFT) | 23.84s | 6.11s |
| Input Price / 1M tokens | $2.00 | $0.50 |
| Output Price / 1M tokens | $12 | $3.00 |
| Context Window | 1.0M |
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 3.1 Pro Preview would cost approximately $12.00/month vs $3.00/month for Gemini 3 Flash Preview (Reasoning) in input costs alone.
Choose Gemini 3.1 Pro Preview when you need higher intelligence (57.2), stronger coding performance (55.5). Choose Gemini 3 Flash Preview (Reasoning) when you need faster output (192 tok/s), lower cost.
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.
Yes, Gemini 3.1 Pro Preview supports image input. Gemini 3 Flash Preview (Reasoning) does not support image input.
Data last synced: March 26, 2026
| N/A |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Audio + File + Image + Text + Video | Text |
| 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.