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Gemini 3.5 Flash production incident and recovery
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Google's Gemini 3.5 Flash experienced a production incident where it randomly exposed its system prompt, prompting investigation and recovery efforts. The model was subsequently taken offline and restored, with the incident raising questions about prompt security and system stability.
- Gemini 3.5 Flash randomly dumped its system prompt in production on May 21, 2026
- Incident occurred across multiple user sessions without clear trigger pattern
- Google took the model offline for investigation and recovery
- Gemini CLI was deprecated or discontinued shortly after the incident
- 3.5 Flash model performance remained competitive despite the operational disruption