LLM API Providers · reliability comparison
Anthropic API vs xAI API: which is more reliable? (2026)
xAI API is more reliable than Anthropic API, scoring 82.0 vs 36.8 out of 100. Over the last 90 days Anthropic API reported 36 incidents and xAI API reported 5, with effective uptime of 97.52% and 99.76% respectively. xAI API resolves incidents faster on average (1h 10m).
Data updated Nov 1, 2026 · How we score
| Metric | Anthropic API | xAI API |
|---|---|---|
| Reliability score | 36.8 | 82.0 |
| Rank (LLM API providers) | #11 | #5 |
| Uptime (90 days) | 97.52% | 99.76% |
| Incidents (90 days) | 36 | 5 |
| Partial / major outages | 23 | 5 |
| Avg time to resolve | 3h 34m | 1h 10m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Anthropic API and xAI API differ
- Anthropic API reported 7.2× as many incidents as xAI API over the last 90 days (36 vs 5).
- Anthropic API had 23 partial or major outages, compared with 5 for xAI API.
- xAI API fixes problems faster: 1h 10m on average, against 3h 34m for Anthropic API (3.1× quicker).
- Anthropic API's longest outage on record lasted 3d (Oct 7, 2026); xAI API's lasted 3h 39m (Sep 3, 2026).
90-day uptime
Anthropic API
xAI API
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Anthropic API incidents
- Partial outageOct 27, 2026 · resolved in 41m
Elevated errors for Claude Sonnet 5.5
Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Partial outageOct 27, 2026 · resolved in 42m
Elevated errors for Claude Sonnet 5.5
Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Partial outageOct 25, 2026 · resolved in 32m
Elevated errors for Claude Fable 5.1
Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Partial outageOct 25, 2026 · resolved in 1h 39m
Elevated errors for Claude Sonnet 5.5 and other models
Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Partial outageOct 24, 2026 · resolved in 37m
Elevated errors for Claude Fable 5 and Claude Fable 5.1
Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Partial outageOct 24, 2026 · resolved in 6m
Elevated errors for Claude Opus 5.5
Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
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
- Cerebras Inference · #4 · 99.88% uptime