GPT-6 Astra vs GLM-5.3
GPT-6 Astra (OpenAI) and GLM-5.3 (Zhipu AI (Z.ai)) compared on price, context window, speed and independent benchmarks. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (61.2 vs 59.5), while GLM-5.3 is 9.3× cheaper on a blended basis. Pick GPT-6 Astra for the hardest tasks and GLM-5.3 when cost dominates.
| GPT-6 Astra | GLM-5.3 | |
|---|---|---|
| Provider | OpenAI | Zhipu AI (Z.ai) |
| Input $/1M | $10.0 | $1.40 |
| Output $/1M | $50.0 | $4.40 |
| Blended $/1M (3:1) | $20.0 | $2.15 |
| Cached input $/1M | $1.00 | $0.26 |
| Context window | 1.1M | 1M |
| Knowledge cutoff | 2026-04 | — |
| License | proprietary | open weights |
| Speed (tok/s) | — | 78 |
| Artificial Analysis Intelligence Index | 61.2 | 59.5 |
| LMArena Elo | — | 1474 |
| GPQA Diamond | 96.1% | 91.7% |
| Humanity's Last Exam | 54.7% | 42.3% |