AI Chat Assistants · monthly outage report

AI Chat Assistants outages: September 2026

The 10 AI chat assistants we track reported 58 incidents in September 2026. ChatGPT reported the most (35). 4 had a clean month: Microsoft Copilot, Pi, Poe, You.com.

Vendor	Incidents	Partial / major	Outage time	Longest
ChatGPT	35	2	1h 28m	3d
Claude	10	7	9h 10m	2h 57m
DeepSeek Chat	8	2	—	—
Grok	2	2	4h 5m	3h 39m
Perplexity	2	2	2h 59m	2h 19m
Gemini	1	0	—	7h 22m
Microsoft Copilot	0	0	—	—
Pi	0	0	—	—
Poe	0	0	—	—
You.com	0	0	—	—

Longest AI Chat Assistants outages in September 2026

Major outageGrokSep 3, 2026 · 3h 39m
[grok.com] Models outage
Partial outageClaudeSep 3, 2026 · 2h 57m
Elevated errors for multiple models
Partial outagePerplexitySep 5, 2026 · 2h 19m
We have identified few connectors that are impacting users.
Partial outageClaudeSep 29, 2026 · 2h 6m
Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API
Partial outageClaudeSep 22, 2026 · 1h 38m
Elevated errors for multiple models
Partial outageClaudeSep 15, 2026 · 1h 26m
Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
Partial outageChatGPTSep 17, 2026 · 1h 21m
Elevated errors affecting ChatGPT Work mode
Major outagePerplexitySep 3, 2026 · 40m
Issue with usage based billing
Partial outageClaudeSep 2, 2026 · 26m
Elevated errors for Claude Sonnet 5
Major outageGrokSep 22, 2026 · 26m
[grok.com] Outages across API, Grok.com, and Grok Build

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