ChatGPT, Gemini, and Claude Down: Generative AI Wobbles

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Key Takeaways

1On April 20, 2026, ChatGPT, Gemini, Copilot, and Claude experienced service interruptions, affecting many users.

2OpenAI is investigating access issues with ChatGPT and Codex, while Claude AI has already resolved its incidents.

3Malfunctions were reported by thousands of users on Down Detector, with OpenAI recording the highest number of alerts.

💡Why it matters — These outages reveal the fragility of generative AI services, disrupting their reliability for users and businesses.

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Full Analysis

Outages of Major Generative AI Chatbots

April 20, 2026, was marked by service interruptions affecting several generative AI chatbots, including ChatGPT, Gemini, Copilot, and Claude. These outages caused significant unavailability for many users.

OpenAI has launched an investigation to understand the reasons behind the inaccessibility of ChatGPT, Codex, and its API platform. Meanwhile, Claude AI successfully deployed a fix, resolving the issues encountered.

Details of the Malfunctions

Users reported difficulties in usage, with reports ranging from several dozen to a few thousand on the Down Detector website. Among the affected services, OpenAI recorded the highest number of reports, with significant alert peaks.

It is important to note that there is no evidence that these problems are interconnected. Other platforms, such as Amazon Web Services, also experienced difficulties on the same day.

Status of Services

Each service has its own dashboard to track their status:

Claude AI: Users encountered high error rates when uploading files and with the Opus 4.6 and Sonnet 4.5 models. However, a fix has resolved the incidents on the claude.ai service and the Claude API.
ChatGPT: Users are unable to access ChatGPT, Codex, and the API platform. OpenAI continues its investigations without providing a specific timeline for service restoration.
Gemini: Issues have been reported regarding the API and Google AI Studio, with an increase in the error rate since April 17, 2026.

These incidents highlight the technical challenges faced by generative AI services, impacting their availability and reliability for users.

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