Astral Codex Ten (ACX) is a widely-read blog by Scott Alexander (Scott Alexander Siskind), a psychiatrist on the US West Coast. Launched in January 2021 as the successor to Slate Star Codex (founded 2013), ACX covers reasoning, science, psychiatry, AI, ethics, genetics, economics, and politics. It is a primary hub of the rationalist and effective altruism communities. In addition to the blog itself, Scott Alexander runs ACX Grants, a recurring grant program awarding $5,000 to $150,000 to promising projects in science, technology, policy, and social innovation, administered in partnership with Manifund.
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Theory of Change
ACX influences the rationalist and effective altruism communities through high-quality writing that improves epistemics and spreads ideas about AI risk, forecasting, and effective giving. By reaching a large audience of researchers, funders, and policymakers, the blog shapes how influential people think about existential risk and AI safety. The ACX Grants program directly funds early-stage, high-potential projects that may not attract traditional funders, acting as a seed-funding mechanism for novel approaches to improving the world. Together, the blog and grants program aim to improve the quality of thinking and resource allocation in the communities most focused on reducing catastrophic and existential risk.
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Details
- Last Updated
- Apr 2, 2026, 9:58 PM UTC
- Created
- Mar 19, 2026, 10:30 PM UTC