Home Compare ChatGPT vs Grok AI Chat Assistants · reliability comparison
ChatGPT vs Grok: which is more reliable? (2026) Grok is more reliable than ChatGPT, scoring 83.5 vs 32.2 out of 100. Over the last 90 days ChatGPT reported 84 incidents and Grok reported 4, with effective uptime of 96.86% and 99.78% respectively. Grok resolves incidents faster on average (1h 19m).
Data updated Nov 2, 2026 · How we score
Metric ChatGPT Grok Reliability score 32.2 83.5 Rank (AI chat assistants) #7 #3 Uptime (90 days) 96.86% 99.78% Incidents (90 days) 84 4 Partial / major outages 9 4 Avg time to resolve 6h 19m 1h 19m Outages we detected 0 0 Transparency score 100/100 100/100
Where ChatGPT and Grok differ ChatGPT reported 21× as many incidents as Grok over the last 90 days (84 vs 4). ChatGPT had 9 partial or major outages, compared with 4 for Grok. Grok fixes problems faster: 1h 19m on average, against 6h 19m for ChatGPT (4.8× quicker). ChatGPT's longest outage on record lasted 9h 54m (Oct 7, 2026); Grok's lasted 3h 39m (Sep 3, 2026). 90-day uptime ChatGPT Aug 5, 2026: 94.71% uptime, 3 incidents (Degraded performance) Aug 6, 2026 – Aug 9, 2026: no incidents Aug 10, 2026: 93.30% uptime, 2 incidents (Degraded performance) Aug 11, 2026: 96.22% uptime, 4 incidents (Degraded performance) Aug 12, 2026: no incidents Aug 13, 2026: 93.80% uptime, 2 incidents (Degraded performance) Aug 14, 2026 – Aug 17, 2026: no incidents Aug 18, 2026: 99.78% uptime, 1 incident (Degraded performance) Aug 19, 2026: no incidents Aug 20, 2026: 97.62% uptime, 2 incidents (Degraded performance) Aug 21, 2026: 96.68% uptime, 1 incident (Degraded performance) Aug 22, 2026 – Aug 26, 2026: no incidents Aug 27, 2026: 97.35% uptime, 1 incident (Degraded performance) Aug 28, 2026 – Aug 30, 2026: no incidents Aug 31, 2026: 88.75% uptime, 1 incident (Partial outage) Sep 1, 2026: 99.77% uptime, 1 incident (Degraded performance) Sep 2, 2026: 99.67% uptime, 1 incident (Degraded performance) Sep 3, 2026: 98.39% uptime, 2 incidents (Partial outage) Sep 4, 2026: 97.64% uptime, 1 incident (Degraded performance) Sep 5, 2026 – Sep 7, 2026: no incidents Sep 8, 2026: 95.34% uptime, 2 incidents (Degraded performance) Sep 9, 2026: 98.80% uptime, 2 incidents (Degraded performance) Sep 10, 2026: 91.19% uptime, 3 incidents (Degraded performance) Sep 11, 2026: 93.74% uptime, 2 incidents (Degraded performance) Sep 12, 2026: 98.77% uptime, 1 incident (Degraded performance) Sep 13, 2026: 98.55% uptime, 2 incidents (Degraded performance) Sep 14, 2026: 88.72% uptime, 3 incidents (Degraded performance) Sep 15, 2026: 97.57% uptime, 2 incidents (Degraded performance) Sep 16, 2026: 99.47% uptime, 1 incident (Degraded performance) Sep 17, 2026: 96.27% uptime, 2 incidents (Partial outage) Sep 18, 2026: 98.50% uptime, 3 incidents (Degraded performance) Sep 19, 2026: 95.07% uptime, 2 incidents (Degraded performance) Sep 20, 2026 – Sep 21, 2026: no incidents Sep 22, 2026: 99.02% uptime, 2 incidents (Degraded performance) Sep 23, 2026: 99.31% uptime, 2 incidents (Degraded performance) Sep 24, 2026: 99.51% uptime, 1 incident (Degraded performance) Sep 25, 2026 – Sep 28, 2026: no incidents Sep 29, 2026: 96.13% uptime, 2 incidents (Degraded performance) Sep 30, 2026: 85.00% uptime, 3 incidents (Degraded performance) Oct 1, 2026: 83.70% uptime, 3 incidents (Partial outage) Oct 2, 2026: 88.82% uptime, 2 incidents (Degraded performance) Oct 3, 2026 – Oct 4, 2026: no incidents Oct 5, 2026: 89.41% uptime, 5 incidents (Degraded performance) Oct 6, 2026: 93.31% uptime, 7 incidents (Degraded performance) Oct 7, 2026: 76.97% uptime, 4 incidents (Partial outage) Oct 8, 2026: 99.02% uptime, 1 incident (Degraded performance) Oct 9, 2026: 91.50% uptime, 3 incidents (Partial outage) Oct 10, 2026: 84.35% uptime, 2 incidents (Partial outage) Oct 11, 2026: 85.00% uptime, 1 incident (Degraded performance) Oct 12, 2026: 89.97% uptime, 1 incident (Degraded performance) Oct 13, 2026: 94.72% uptime, 1 incident (Degraded performance) Oct 14, 2026: 93.88% uptime, 2 incidents (Degraded performance) Oct 15, 2026: 81.43% uptime, 2 incidents (Partial outage) Oct 16, 2026: 93.28% uptime, 1 incident (Degraded performance) Oct 17, 2026 – Oct 18, 2026: no incidents Oct 19, 2026: 99.56% uptime, 1 incident (Degraded performance) Oct 20, 2026: 97.91% uptime, 1 incident (Partial outage) Oct 21, 2026: 99.35% uptime, 1 incident (Degraded performance) Oct 22, 2026: 94.61% uptime, 2 incidents (Degraded performance) Oct 23, 2026: 99.47% uptime, 3 incidents (Degraded performance) Oct 24, 2026 – Oct 29, 2026: no incidents Oct 30, 2026: 99.00% uptime, 1 incident (Degraded performance) Oct 31, 2026 – Nov 2, 2026: no incidents 90 days ago 96.890% average daily uptime Today Grok Aug 5, 2026 – Sep 2, 2026: no incidents Sep 3, 2026: 84.77% uptime, 1 incident (Major outage) Sep 4, 2026 – Sep 21, 2026: no incidents Sep 22, 2026: 98.20% uptime, 1 incident (Major outage) Sep 23, 2026 – Oct 6, 2026: no incidents Oct 7, 2026: 99.59% uptime, 1 incident (Major outage) Oct 8, 2026 – Oct 29, 2026: no incidents Oct 30, 2026: 97.80% uptime, 1 incident (Partial outage) Oct 31, 2026 – Nov 2, 2026: no incidents 90 days ago 99.782% average daily uptime Today