openai vs xai — AI API latency comparison
As of July 24, 2026, openai has lower edge latency (time-to-first-byte) than xai in 3 of 4 measured region(s). From Europe (Germany), openai responds in 231 ms p50 vs 298 ms.
Edge latency by region
| Region | openai p50 TTFB | xai p50 TTFB | Faster |
|---|---|---|---|
| Asia (Tokyo) | 202 ms | 172 ms | xai |
| Europe (Germany) | 231 ms | 298 ms | openai |
| South America (São Paulo) | 221 ms | 270 ms | openai |
| US (Central) | 126 ms | 129 ms | openai |
Full details: openai by region · xai by region.