Updated March 26, 2026· Based on independent benchmark data
Gemini 3.1 Pro Preview leads in intelligence with a score of 57.2 vs 48.5. For speed, Grok 4.20 Beta 0309 (Reasoning) wins at 246 tok/s vs 113 tok/s.
| Metric | Grok 4.20 Beta 0309 (Reasoning) | Gemini 3.1 Pro Preview |
|---|---|---|
| Intelligence Score | 48.5 | 57.2 |
| Coding Score | 42.2 | 55.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 246 tok/s | 113 tok/s |
| Latency (TTFT) | 11.75s | 23.84s |
| Input Price / 1M tokens | $2.00 | $2.00 |
| Output Price / 1M tokens | $6.00 | $12 |
| Context Window | N/A |
Gemini 3.1 Pro Preview outperforms Grok 4.20 Beta 0309 (Reasoning) on the intelligence index with a score of 57.2 compared to 48.5. For coding tasks, Gemini 3.1 Pro Preview has the edge with a coding score of 55.5 vs 42.2.
Grok 4.20 Beta 0309 (Reasoning) generates output significantly faster at 246 tok/s compared to Gemini 3.1 Pro Preview's 113 tok/s, making it 2.2x faster for streaming responses. Time to first token is 11.75s for Grok 4.20 Beta 0309 (Reasoning) vs 23.84s for Gemini 3.1 Pro Preview, which affects perceived responsiveness in interactive applications.
Gemini 3.1 Pro Preview is more affordable at $2.00/1M input tokens ($12/1M output), while Grok 4.20 Beta 0309 (Reasoning) costs $2.00/1M input ($6.00/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, Grok 4.20 Beta 0309 (Reasoning) would cost approximately $12.00/month vs $12.00/month for Gemini 3.1 Pro Preview in input costs alone.
Choose Grok 4.20 Beta 0309 (Reasoning) when you need faster output (246 tok/s). 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 42.2), making it the better choice for programming tasks.
Gemini 3.1 Pro Preview is cheaper at $2.00/1M input tokens vs $2.00/1M for Grok 4.20 Beta 0309 (Reasoning).
Grok 4.20 Beta 0309 (Reasoning) is faster, producing output at 246 tok/s compared to Gemini 3.1 Pro Preview's 113 tok/s.
No, Grok 4.20 Beta 0309 (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 Grok 4.20 Beta 0309 (Reasoning) may be better for specific use cases like budget-conscious projects or speed-critical applications.