Gemini 3.8 Flash vs Grok 4.6
Gemini 3.8 Flash 
Grok 4.6 Verdict
- Gemini 3.8 Flash (medium) and Grok 4.6 (medium) are level on quality (63.5 vs 63.8).
- Gemini 3.8 Flash (medium) is stronger in knowledge, long context, multimodal.
- Grok 4.6 (medium) is stronger in coding, composite, reasoning.
- Gemini 3.8 Flash (medium) is 2.0× cheaper ($1.50 vs $3.00 per 1M blended).
- Gemini 3.8 Flash (medium) streams 5.0× faster (273 vs 55 tokens per second).
| Metric | Gemini 3.8 Flash (medium) | Grok 4.6 (medium) |
|---|---|---|
| BenchLeader Index | 63.5 | 63.8 |
| Coding score | 63.6 | 63.9 |
| Composite score | 79.4 | 83.2 |
| Knowledge score | 77.6 | 77.3 |
| Long context score | 68.7 | 67.1 |
| Multimodal score | 68.9 | – |
| Reasoning score | – | 62.1 |
| Blended price $/M | $1.50 | $3.00 |
| Output speed | 273 tok/s | 55 tok/s |
| Time to first answer | 13.8 s | 36.7 s |
| Context window | 1M | 500k |
| SciCode | 54.4% | 54.6% |
| AA Intelligence Index | 40 | 43.0 |
| AA-LCR | 84.0% | 81.0% |
| MMMU-Pro | 84.2% | – |
| AA-Omniscience | 28.6 | 28 |
| GPQA Diamond (AA) | 93.5% | 93.5% |
| Humanity's Last Exam (AA) | 42.1% | 42.1% |
| SciCode (AA) | 55.1% | 55.9% |
| ARC-AGI-1 | – | 87.5% |
| ARC-AGI-2 | – | 61.3% |
Data as of 2026-09-09. Best configuration of each model; every score links to its source on the model pages.