--- category: Private Organization created: 2026-06-19 location: San Francisco, California summary: Open Philanthropy is the grantmaking organization funded by Facebook cofounder Dustin Moskovitz and Cari Tuna that became the durable financial backbone of effective altruism and AI-safety work, directing more than four billion dollars and serving as an early funder of Anthropic. tags: - Organization - OpenPhilanthropy - EffectiveAltruism - Longtermism - ArtificialIntelligence - DustinMoskovitz updated: 2026-06-19 --- Open Philanthropy is a grantmaking organization, funded chiefly by Facebook and Asana cofounder [Dustin Moskovitz](/people/dustin-moskovitz/) and his wife [Cari Tuna](/people/cari-tuna/), that became the durable financial backbone of the [Effective Altruism](/concepts/effective-altruism/) movement and of longtermist and AI-safety work. Where the [FTX Future Fund](/organizations/ftx-future-fund/) of [Sam Bankman-Fried](/people/sam-bankman-fried/) was the movement's flashiest and most short-lived funder, Open Philanthropy is its largest sustained one, directing more than four billion dollars in grants by 2025. It was an early backer of the AI company [Anthropic](/organizations/anthropic/), and its longtime co-chief executive [Holden Karnofsky](/people/holden-karnofsky/) later moved into AI-safety work and is married to Anthropic president [Daniela Amodei](/people/daniela-amodei/).[^1][^2] ### Origins The organization grew out of [GiveWell](/organizations/givewell/), the charity evaluator Karnofsky cofounded with Elie Hassenfeld, and Good Ventures, the foundation Moskovitz and Tuna established in 2011. The two joined to form the Open Philanthropy Project in 2014, which began independent operations in 2017. Tuna, a former *Wall Street Journal* reporter, and Moskovitz, who made his fortune as one of the earliest Facebook employees and the cofounder of the software firm Asana, committed the bulk of their wealth to the effort.[^1][^3] The split from GiveWell separated two functions: GiveWell kept recommending a short list of proven global-health charities for ordinary donors, while Open Philanthropy took on the larger, riskier, harder-to-measure giving that Good Ventures' scale allowed. Alexander Berger rose to co-chief executive alongside Karnofsky and became sole chief executive when Karnofsky stepped back in 2023. Good Ventures supplies nearly all of Open Philanthropy's grant money, a dependence the organization acknowledged when, operating as Coefficient Giving, it began advising outside donors and directed more than 100 million dollars of non-Good-Ventures money in 2024.[^2][^5] ### Funding Priorities and the AI Turn Open Philanthropy makes grants in two broad areas: global health and wellbeing, and longtermism, the latter encompassing potential risks from advanced artificial intelligence, pandemic preparedness, and the far future. Its AI-risk funding flowed to the same research community around the [Machine Intelligence Research Institute](/organizations/machine-intelligence-research-institute/) and the [Future of Humanity Institute](/organizations/future-of-humanity-institute/) that the [Rationalist Community](/concepts/rationalist-community/) built, making Open Philanthropy the principal institutional patron of AI-safety work outside the technology companies themselves. Karnofsky took a leave from his co-chief-executive role in 2023 and moved into a role focused on AI strategy. The organization renamed itself Coefficient Giving in 2025.[^2][^4] In 2017 Open Philanthropy made a 30-million-dollar grant to OpenAI that came with a board seat for Karnofsky, an early and unusual instance of a funder embedding itself inside an AI lab; it later became an early investor in Anthropic, where Karnofsky's wife Daniela Amodei is president. By June 2025 the organization had directed more than 4 billion dollars in cumulative grants. The November 2025 rename to Coefficient Giving, under chief executive Alexander Berger, marked a shift toward running multi-donor funds so other philanthropists could pool money into its cause areas, with the name chosen to signal a "coefficient" that multiplies the impact of partner giving. Its concentration of AI-safety money has drawn criticism that a single foundation funds much of the field that scrutinizes the AI labs to which it is financially tied.[^2][^4][^5] [^1]: "How Effective is Effective Altruism? A Deep Dive Into Two of Open Philanthropy's EA-Inspired Programs," *Inside Philanthropy,* March 16, 2023. https://www.insidephilanthropy.com/home/2023-3-16-how-effective-is-effective-altruism-a-deep-dive-into-two-of-open-philanthropys-ea-inspired-programs [^2]: "How Dependent is the Effective Altruism Movement on Dustin Moskovitz and Cari Tuna?" EA Forum. https://forum.effectivealtruism.org/posts/4BJSXH9ho4eYNT73P/how-dependent-is-the-effective-altruism-movement-on-dustin [^3]: "Giving in the Light of Reason," *Stanford Social Innovation Review,* on Good Ventures, GiveWell, and the Open Philanthropy partnership. https://ssir.org/articles/entry/giving_in_the_light_of_reason [^4]: "The Making of Anthropic CEO Dario Amodei," Alex Kantrowitz, on Open Philanthropy as an early Anthropic funder and the Karnofsky tie. https://kantrowitz.medium.com/the-making-of-anthropic-ceo-dario-amodei-449777529dd6 [^5]: "Open Philanthropy Becomes Coefficient Giving, Expanding Work With Multiple Donors," Coefficient Giving, November 2025, on the rename, Alexander Berger, the 4-billion-dollar grant total, and the multi-donor expansion; "OpenAI General Support," Good Ventures, on the March 2017 30-million-dollar grant and Karnofsky board seat. https://coefficientgiving.org/research/press-release-open-philanthropy-becomes-coefficient-giving-expanding-work-with-multiple-donors/