GPT-6 Astra vs Kimi K3
GPT-6 Astra (OpenAI) and Kimi K3 (Moonshot AI) compared on price, context window, speed and independent benchmarks. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (61.2 vs 59.7), while Kimi K3 is 3.3× cheaper on a blended basis. Pick GPT-6 Astra for the hardest tasks and Kimi K3 when cost dominates.
| GPT-6 Astra | Kimi K3 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Input $/1M | $10.0 | $3.00 |
| Output $/1M | $50.0 | $15.0 |
| Blended $/1M (3:1) | $20.0 | $6.00 |
| Cached input $/1M | $1.00 | $0.30 |
| Context window | 1.1M | 1.0M |
| Knowledge cutoff | 2026-04 | — |
| License | proprietary | open weights |
| Speed (tok/s) | — | 38 |
| Artificial Analysis Intelligence Index | 61.2 | 59.7 |
| LMArena Elo | — | 1476 |
| GPQA Diamond | 96.1% | 93.5% |
| SWE-bench Verified | — | 93.4% |
| Humanity's Last Exam | 54.7% | 46.9% |
| MMMU | — | 81.6% |