LLM API Providers · reliability comparison
Cerebras Inference vs xAI API: which is more reliable? (2026)
Cerebras Inference is more reliable than xAI API, scoring 89.3 vs 82.0 out of 100. Over the last 90 days Cerebras Inference reported 2 incidents and xAI API reported 5, with effective uptime of 99.88% and 99.76% respectively. xAI API resolves incidents faster on average (1h 10m).
Data updated Nov 1, 2026 · How we score
VS
| Metric | Cerebras Inference | xAI API |
|---|---|---|
| Reliability score | 89.3 | 82.0 |
| Rank (LLM API providers) | #4 | #5 |
| Uptime (90 days) | 99.88% | 99.76% |
| Incidents (90 days) | 2 | 5 |
| Partial / major outages | 1 | 5 |
| Avg time to resolve | 2h 29m | 1h 10m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Cerebras Inference and xAI API differ
- xAI API reported 2.5× as many incidents as Cerebras Inference over the last 90 days (5 vs 2).
- xAI API had 5 partial or major outages, compared with 1 for Cerebras Inference.
- xAI API fixes problems faster: 1h 10m on average, against 2h 29m for Cerebras Inference (2.1× quicker).
- Cerebras Inference's longest outage on record lasted 9h 8m (Feb 4, 2026); xAI API's lasted 3h 39m (Sep 3, 2026).
90-day uptime
Cerebras Inference
xAI API
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Cerebras Inference incidents
- Partial outageSep 25, 2026 · resolved in 4h 58m
Affected: GPT-OSS-120B, Qwen-3.8-27b
- Degraded performanceAug 27, 2026 · resolved in <1m
Affected: GPT-OSS-120B
Recent xAI API incidents
- Partial outageOct 24, 2026 · resolved in <1m
- Major outageSep 22, 2026 · resolved in 26m
[Global (api.x.ai)] Outages across API, Grok.com, and Grok Build
- Partial outageSep 10, 2026 · resolved in 12m
- Major outageSep 3, 2026 · resolved in 3h 39m
- Partial outageAug 17, 2026 · resolved in 1h 31m
Other LLM API providers to consider
- Perplexity API · #1 · 99.94% uptime
- Cohere · #2 · 99.94% uptime
- Groq · #3 · 99.94% uptime
- DeepSeek API · #6 · 100% uptime