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Rai Sur and Nuno Sempere Sentinel: Early Detection and Response for Global Catastrophes online Sentinel is an open-source intelligence organization focused on the rapid identification and response to global catastrophic risks (GCRs), particularly those with short emergence horizons. The organization develops advanced monitoring tools and employs world-class forecasters to analyze emerging threats, distributing findings via weekly briefs and social media to build capacity for crisis intervention. Sentinel currently utilizes OSINT to track diverse signals, including social media for AI incidents and novel pathogens, and Chinese military news. With $700K of a projected $1.6M budget secured, the organization seeks further funding to scale its engineering and forecasting capabilities, establish a multi-channel emergency alert system, appoint a Head of Emergency Response, and create a rapid deployment fund for immediate action during crises. Sentinel differentiates itself from other GCR initiatives through its emphasis on bottom-up, real-time signal processing and agile response mechanisms, estimating a notable contribution to existential risk reduction. – AI-generated abstract.

Sentinel: Early Detection and Response for Global Catastrophes

Rai Sur and Nuno Sempere

Effective Altruism Forum, November 18, 2025

Abstract

Sentinel is an open-source intelligence organization focused on the rapid identification and response to global catastrophic risks (GCRs), particularly those with short emergence horizons. The organization develops advanced monitoring tools and employs world-class forecasters to analyze emerging threats, distributing findings via weekly briefs and social media to build capacity for crisis intervention. Sentinel currently utilizes OSINT to track diverse signals, including social media for AI incidents and novel pathogens, and Chinese military news. With $700K of a projected $1.6M budget secured, the organization seeks further funding to scale its engineering and forecasting capabilities, establish a multi-channel emergency alert system, appoint a Head of Emergency Response, and create a rapid deployment fund for immediate action during crises. Sentinel differentiates itself from other GCR initiatives through its emphasis on bottom-up, real-time signal processing and agile response mechanisms, estimating a notable contribution to existential risk reduction. – AI-generated abstract.

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