Updated March 26, 2026· Based on independent benchmark data
Grok 4.20 Beta 0309 (Reasoning) leads in intelligence with a score of 48.5 vs 46.4. Gemini 3 Flash Preview (Reasoning) is 4.0x cheaper at $0.50/1M tokens vs $2.00/1M.
| Metric | Grok 4.20 Beta 0309 (Reasoning) | Gemini 3 Flash Preview (Reasoning) |
|---|---|---|
| Intelligence Score | 48.5 | 46.4 |
| Coding Score | 42.2 | 42.6 |
| Math Score | N/A | 97.0 |
| Speed (tok/s) | 246 tok/s | 192 tok/s |
| Latency (TTFT) | 11.75s | 6.11s |
| Input Price / 1M tokens | $2.00 | $0.50 |
| Output Price / 1M tokens | $6.00 | $3.00 |
| Context Window |
Grok 4.20 Beta 0309 (Reasoning) outperforms Gemini 3 Flash Preview (Reasoning) on the intelligence index with a score of 48.5 compared to 46.4. Their coding capabilities are closely matched (42.2 vs 42.6).
Grok 4.20 Beta 0309 (Reasoning) generates output significantly faster at 246 tok/s compared to Gemini 3 Flash Preview (Reasoning)'s 192 tok/s, making it 1.3x faster for streaming responses. Time to first token is 6.11s for Gemini 3 Flash Preview (Reasoning) vs 11.75s for Grok 4.20 Beta 0309 (Reasoning), 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 Grok 4.20 Beta 0309 (Reasoning) costs $2.00/1M input ($6.00/1M output). That makes Grok 4.20 Beta 0309 (Reasoning) 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, Grok 4.20 Beta 0309 (Reasoning) would cost approximately $12.00/month vs $3.00/month for Gemini 3 Flash Preview (Reasoning) in input costs alone.
Choose Grok 4.20 Beta 0309 (Reasoning) when you need higher intelligence (48.5). Choose Gemini 3 Flash Preview (Reasoning) when you need lower cost.
Gemini 3 Flash Preview (Reasoning) scores higher on coding benchmarks (42.6 vs 42.2), 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 Grok 4.20 Beta 0309 (Reasoning).
Grok 4.20 Beta 0309 (Reasoning) is faster, producing output at 246 tok/s compared to Gemini 3 Flash Preview (Reasoning)'s 192 tok/s.
No, Grok 4.20 Beta 0309 (Reasoning) does not support image input. Neither model supports image input.
Data last synced: March 26, 2026
| N/A |
| N/A |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Text | Text |
| Output Modalities | Text | Text |
| Free Tier | No | No |
It depends on your priorities. Grok 4.20 Beta 0309 (Reasoning) scores higher on intelligence (48.5), but Gemini 3 Flash Preview (Reasoning) may be better for specific use cases like budget-conscious projects or speed-critical applications.