# openai vs xai — AI API latency comparison
Updated July 24, 2026. As of July 24, 2026, openai has lower edge latency (time-to-first-byte) than xai in 3 of 4 measured region(s). From South America (São Paulo), openai responds in 221 ms p50 vs 265 ms.

| Region | openai p50 | xai p50 | Faster |
| --- | --- | --- | --- |
| Asia (Tokyo) | 202 ms | 173 ms | xai |
| Europe (Germany) | 290 ms | 299 ms | openai |
| South America (São Paulo) | 221 ms | 265 ms | openai |
| US (Central) | 127 ms | 128 ms | openai |


Source: https://llmlatency.dev/compare/openai-vs-xai