Grok 4.6 vs Gemini 3.8 Flash
Grok 4.6 (xAI) and Gemini 3.8 Flash (Google) compared on price, context window, speed and independent benchmarks. Grok 4.6 scores higher on the Artificial Analysis Intelligence Index (60.9 vs 58.7), while Gemini 3.8 Flash is 2.0× cheaper on a blended basis. Pick Grok 4.6 for the hardest tasks and Gemini 3.8 Flash when cost dominates.
| Grok 4.6 | Gemini 3.8 Flash | |
|---|---|---|
| Provider | xAI | |
| Input $/1M | $2.00 | $0.75 |
| Output $/1M | $6.00 | $3.75 |
| Blended $/1M (3:1) | $3.00 | $1.50 |
| Cached input $/1M | $0.50 | $0.07 |
| Context window | 500K | 1.0M |
| Knowledge cutoff | 2026-02 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | 60 | 417 |
| Artificial Analysis Intelligence Index | 60.9 | 58.7 |
| LMArena Elo | 1444 | — |
| GPQA Diamond | 94.9% | 95.3% |
| Humanity's Last Exam | 42.9% | 47.8% |