GPT-6 Astra vs Grok 4.6
GPT-6 Astra (OpenAI) and Grok 4.6 (xAI) compared on price, context window, speed and independent benchmarks. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (61.2 vs 60.9), while Grok 4.6 is 6.7× cheaper on a blended basis. Pick GPT-6 Astra for the hardest tasks and Grok 4.6 when cost dominates.
| GPT-6 Astra | Grok 4.6 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Input $/1M | $10.0 | $2.00 |
| Output $/1M | $50.0 | $6.00 |
| Blended $/1M (3:1) | $20.0 | $3.00 |
| Cached input $/1M | $1.00 | $0.50 |
| Context window | 1.1M | 500K |
| Knowledge cutoff | 2026-04 | 2026-02 |
| License | proprietary | proprietary |
| Speed (tok/s) | — | 60 |
| Artificial Analysis Intelligence Index | 61.2 | 60.9 |
| LMArena Elo | — | 1444 |
| GPQA Diamond | 96.1% | 94.9% |
| Humanity's Last Exam | 54.7% | 42.9% |