AI Chat Assistants · reliability comparison

Claude vs Grok: which is more reliable? (2026)

Grok is more reliable than Claude, scoring 83.4 vs 56.9 out of 100. Over the last 90 days Claude reported 39 incidents and Grok reported 4, with effective uptime of 99.25% and 99.77% respectively. Grok resolves incidents faster on average (1h 19m).

Data updated Nov 1, 2026 · How we score

Claude

56.9/100

Operational

Visit Claude ↗

Grok

83.4/100

Operational

Visit Grok ↗
VS
MetricClaudeGrok
Reliability score56.983.4
Rank (AI chat assistants)#6#3
Uptime (90 days)99.25%99.77%
Incidents (90 days)394
Partial / major outages214
Avg time to resolve1h 24m1h 19m
Outages we detected00
Transparency score100/100100/100

Where Claude and Grok differ

  • Claude reported 9.8× as many incidents as Grok over the last 90 days (39 vs 4).
  • Claude had 21 partial or major outages, compared with 4 for Grok.
  • Claude's longest outage on record lasted 3h 24m (Aug 24, 2026); Grok's lasted 3h 39m (Sep 3, 2026).

90-day uptime

Claude

Aug 4, 2026: no dataAug 5, 2026: 95.32% uptime, 2 incidents (Degraded performance)Aug 6, 2026 – Aug 11, 2026: no incidentsAug 12, 2026: 97.32% uptime, 1 incident (Degraded performance)Aug 13, 2026: 96.70% uptime, 1 incident (Partial outage)Aug 14, 2026: 99.90% uptime, 1 incident (Partial outage)Aug 15, 2026: 99.04% uptime, 1 incident (Partial outage)Aug 16, 2026: 97.52% uptime, 1 incident (Major outage)Aug 17, 2026: 99.03% uptime, 1 incident (Degraded performance)Aug 18, 2026: 98.31% uptime, 1 incident (Degraded performance)Aug 19, 2026: 99.16% uptime, 1 incident (Degraded performance)Aug 20, 2026: 98.78% uptime, 2 incidents (Partial outage)Aug 21, 2026 – Aug 23, 2026: no incidentsAug 24, 2026: 92.72% uptime, 3 incidents (Partial outage)Aug 25, 2026 – Aug 30, 2026: no incidentsAug 31, 2026: 98.91% uptime, 2 incidents (Degraded performance)Sep 1, 2026: 99.15% uptime, 2 incidents (Degraded performance)Sep 2, 2026: 99.08% uptime, 1 incident (Partial outage)Sep 3, 2026: 93.19% uptime, 2 incidents (Partial outage)Sep 4, 2026 – Sep 10, 2026: no incidentsSep 11, 2026: 99.39% uptime, 1 incident (Partial outage)Sep 12, 2026 – Sep 14, 2026: no incidentsSep 15, 2026: 97.00% uptime, 1 incident (Partial outage)Sep 16, 2026 – Sep 21, 2026: no incidentsSep 22, 2026: 96.59% uptime, 1 incident (Partial outage)Sep 23, 2026 – Sep 28, 2026: no incidentsSep 29, 2026: 95.63% uptime, 1 incident (Partial outage)Sep 30, 2026 – Oct 4, 2026: no incidentsOct 5, 2026: 99.44% uptime, 1 incident (Partial outage)Oct 6, 2026: 99.35% uptime, 1 incident (Partial outage)Oct 7, 2026 – Oct 20, 2026: no incidentsOct 21, 2026: 99.58% uptime, 1 incident (Degraded performance)Oct 22, 2026: 97.32% uptime, 1 incident (Degraded performance)Oct 23, 2026: 98.45% uptime, 1 incident (Major outage)Oct 24, 2026: 97.74% uptime, 3 incidents (Major outage)Oct 25, 2026: 95.42% uptime, 2 incidents (Partial outage)Oct 26, 2026: no incidentsOct 27, 2026: 97.10% uptime, 2 incidents (Partial outage)Oct 28, 2026: 96.51% uptime, 2 incidents (Degraded performance)Oct 29, 2026 – Nov 1, 2026: no incidents
90 days ago99.256% average daily uptimeToday

Grok

Aug 4, 2026 – Sep 2, 2026: no incidentsSep 3, 2026: 84.77% uptime, 1 incident (Major outage)Sep 4, 2026 – Sep 21, 2026: no incidentsSep 22, 2026: 98.20% uptime, 1 incident (Major outage)Sep 23, 2026 – Oct 6, 2026: no incidentsOct 7, 2026: 99.59% uptime, 1 incident (Major outage)Oct 8, 2026 – Oct 29, 2026: no incidentsOct 30, 2026: 97.80% uptime, 1 incident (Partial outage)Oct 31, 2026 – Nov 1, 2026: no incidents
90 days ago99.782% average daily uptimeToday

Recent Claude incidents

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Recent Grok incidents

Full Grok reliability report →

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