Trace

Lightcone Infrastructure

www.lightconeinfrastructure.com · organization

Runs LessWrong, the AI Alignment Forum and the Lighthaven campus in Berkeley, infrastructure for the rationality and AI safety communities.

Leadership

Team

13 people

source, Oct 2026

AI safety metaOther existential riskAI safety fieldbuildingEA infrastructureGlobal health and development

Received
$33,080,267
from 93 funders
Grants
121
Funders
93
Years active
2017–26

Grants over time

$0$2.5M$5.0M$7.5M$10M2017201820192020202120222023202420252026
Jaan TallinnCoefficient GivingUnknown DonorsDustin MoskovitzFTX Future FundAll others

Biggest funders

Jaan Tallinn$13,667,30041%24
Coefficient Giving$8,220,00025%4
Dustin Moskovitz$3,011,0009%1
FTX Future Fund$2,000,0006%1
Vitalik Buterin$1,000,0003%1
Casey and Family Foundation$500,0002%1
EA Infrastructure Fund$250,0001%1
drethelin$150,0000%1

Reviews

Alexandra Bates · Manifund · full post · Jan 1, 2026

Lightcone Infrastructure, Jan 2026

Read more ▾

Donating 50k. Lightcone's main projects – Lighthaven, Lesswrong, and websites for good causes – all seem very valuable for making AI go well. I would like there to be more AI safety events, better public discussion of AIS ideas, and more big comms efforts. I trust the Lightcone team a lot: they have good taste, are thoughtful and caring, and have interestingly different views on how to make AI go well from many other orgs I spend a lot of time around. I'd like to give them more financial security, so they can run their core products and have the freedom to try new things.

Marius Hobbhahn · Manifund · full post · Dec 26, 2025

Lightcone Infrastructure, Dec 2025

Read more ▾

Donating ~half of my remaining regranting funding ($25k). While this is not in the category of things I wanted to fund with the regranting pot (i.e. individuals working on scheming research), I think Lighthaven is worth supporting.

My main evidence is that my MATS scholars really like it and when I've been at Lighthaven for conferences or other meetings I thought it was a great venue.

One caveat is that I think Lighthaven should be funded through institutional donors rather than many small grants due to the obvious overhead considerations and large funding amounts. Though, in the current situation individual donations seem obviously better than nothing.

Lauren Mangla · Manifund · full post · Dec 25, 2025

Lightcone Infrastructure, Dec 2025

Read more ▾

I donated $50k via Manifund because I think Lightcone is great and tends to have a harder time getting funding from the usual suspects. I do work at AIFP, and we’ve been working with Lightcone on some new projects, but this donation is not a payment and is not tied to my role at AIFP or our working relationship. Obviously, working with Lightcone has made me think more positively about them, which likely influenced my decision to give this grant. That said, the donation is in my capacity as a Manifund regrantor and long-time admirer of what they do.

I think Lighthaven is very special, and I want Lightcone to have more capacity. I think they are amazing at web dev and want them to be able to help projects like AIFP (and others) with web stuff more than they currently can. I also really want them to have the space and freedom to do more creative, experimental things, like Inkhaven and hosting The Curve, and to run more programs and events in that spirit.

I think Lightcone is unusually well-positioned to try interesting things that others won’t, and I think that’s really good for the community. LessWrong is also great and important, but I’m honestly less worried about LessWrong going under if I don’t donate. What I want more from this is Lightcone being able to use the money to try new, creative projects that have trickle-down benefits for the rest of the ecosystem.

Zvi Mowshowitz · nonprofits.zone · full post · Nov 26, 2025

Confidence: High, Funding needs: High

Read more ▾

With that said, Lightcone is my clear number one. I think they are doing great work, both in terms of LessWrong and also Lighthaven. There is the potential, with greater funding, to enrich both of these tasks, and also for expansion.

There is a large force multiplier here (although that is true of a number of other organizations I list as well).

They made their 2024 fundraising pitch here, I encourage reading it.

Where I am beyond confident is that if LessWrong, the Alignment Forum or the venue Lighthaven were unable to continue, any one of these would be a major, quite bad unforced error.

LessWrong and the Alignment Forum a central part of the infrastructure of the meaningful internet.

Lighthaven is miles and miles away the best event venue I have ever seen. I do not know how to convey how much the design contributes to having a valuable conference, designed to facilitate the best kinds of conversations via a wide array of nooks and pathways designed with the principles of Christopher Alexander. This contributes to and takes advantage of the consistently fantastic set of people I encounter there.

The marginal costs here are large (~$3 million per year, some of which is made up by venue revenue), but the impact here is many times that, and I believe they can take on more than ten times that amount and generate excellent returns.

If we can go beyond short term funding needs, they can pay off the mortgage to secure a buffer, and buy up surrounding buildings to secure against neighbors (who can, given this is Berkeley, cause a lot of trouble) and to secure more housing and other space. This would secure the future of the space.

I would love to see them then expand into additional spaces. They note this would also require the right people.

Donate through every.org, or contact team@lesswrong.com.

Thomas Larsen · Manifund · full post · Jun 18, 2025

Lightcone Infrastructure, Jun 2025

Read more ▾

I'm donating at least $10k (via Manifund).

I think Lightcone has been hugely impactful (see the above, which I think is very compelling evidence of a large amount of impact), and can't get funded from many of the usual places.

COI Note: Lightcone contracted with AI Futures Project (the org I work for) on AI 2027, and is continuing to contract with us on followup work. This is a donation for general support, and not anything like payment for services received.

Michael Dickens · mdickens.me · full post · Nov 18, 2024

Classification: Would fund if I had more money

Read more ▾

Lightcone runs LessWrong and an office that Lightcone calls “Bell Labs for longtermism”.

Lightcone has a detailed case for impact on Manifund. In short, Lightcone maintains LessWrong, and LessWrong is upstream of a large quantity of AI safety work.

I believe Lightcone has high expected value and it can make good use of marginal donations.

By maintaining LessWrong, Lightcone somewhat improves many AI safety efforts (plus efforts on other beneficial projects that don’t relate to AI safety). If I were very uncertain about what sort of work was best, I might donate to Lightcone as a way to provide diffuse benefits across many areas. But since I believe (a specific sort of) policy work has much higher EV than AI safety research, I believe it makes more sense to fund that policy work directly.

An illustration with some made-up numbers: Suppose that

  • There are 10 categories of AI safety work.
  • Lightcone makes each of them 20% better.
  • The average AI safety work produces 1 utility point.
  • Well-directed AI policy produces 5 utility points.

Then a donation to Lightcone is worth 2 utility points, and my favorite AI policy orgs are worth 5 points. So a donation to Lightcone is better than the average AI safety org, but not as good as good policy orgs.

Neel Nanda · Manifund · full post · Aug 22, 2024

Lightcone Infrastructure, Aug 2024

Read more ▾

I'm not sure how I feel about Lightcone as an impactful donation opportunity on the margin, but I have personally benefitted a fair bit from Lightcone's work and broadly consider it to be high quality, so feel like it's in the spirit of EACC to donate!

Grants received

Date ↓FunderViaAmountCauseSourcePurpose
Sep 2026Jaan TallinnSurvival and Flourishing Fund$671,000Epistemic infrastructuresffGeneral support
Sep 2026Dustin MoskovitzSurvival and Flourishing Fund$3,011,000Epistemic infrastructuresffGeneral support
Apr 8, 2026Romain DelégliseManifund$120Epistemic infrastructuremanifundLightcone Infrastructure
Apr 7, 2026Nick SaraevManifund$1,000Epistemic infrastructuremanifundLightcone Infrastructure
Jan 17, 2026Jesse RichardsonManifund$20,000Epistemic infrastructuremanifundLightcone Infrastructure
Jan 1, 2026Alexandra BatesManifund$50,000Epistemic infrastructuremanifundLightcone Infrastructure
Dec 26, 2025Marius HobbhahnManifund$25,000Epistemic infrastructuremanifundLightcone Infrastructure
Dec 25, 2025Lauren ManglaManifund$50,000Epistemic infrastructuremanifundLightcone Infrastructure
Dec 13, 2025Unknown Donors~$1,855,000*Epistemic infrastructureorg_reportedDonations to the fundraiser launched in December 2025 that are not itemized individually
Nov 15, 2025Stephen McAleeseManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Oct 27, 2025Ben EisenpressManifund$250Epistemic infrastructuremanifundLightcone Infrastructure
Sep 2025Jaan TallinnSurvival and Flourishing Fund$1,311,000Epistemic infrastructuresffGeneral support
Jul 21, 202508068931-db8f-46fa-9222-e1a4f8791df4Manifund$10Epistemic infrastructuremanifundLightcone Infrastructure
Jun 18, 2025Thomas LarsenManifund$10,000Epistemic infrastructuremanifundLightcone Infrastructure
Mar 11, 2025Josh SacksManifund$1,000Epistemic infrastructuremanifundLightcone Infrastructure
Jan 30, 2025Vincent WeisserManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Jan 19, 2025Unknown Donors~$1,912,788†Epistemic infrastructureorg_reportedDonations to the 2024–25 LessWrong + Lighthaven fundraiser that are not itemized individually
Jan 4, 2025Dusan D NesicManifund$1,114Epistemic infrastructuremanifundLightcone Infrastructure
Dec 30, 2024fribManifund$1,040Epistemic infrastructuremanifundLightcone Infrastructure
Dec 29, 2024Evan HubingerManifund$10,000Epistemic infrastructuremanifundLightcone Infrastructure
Dec 18, 2024Saul MunnManifund$1,000Epistemic infrastructuremanifundLightcone Infrastructure
Dec 15, 2024Eric NeymanManifund$5,000Epistemic infrastructuremanifundLightcone Infrastructure
Dec 9, 2024Lucie PhilipponManifund$150Epistemic infrastructuremanifundLightcone Infrastructure
Dec 5, 2024Jay SchreiberManifund$18,100Epistemic infrastructuremanifundLightcone Infrastructure
Dec 3, 2024Jan GörgensManifund$10Epistemic infrastructuremanifundLightcone Infrastructure
Dec 1, 2024Chin Ze ShenManifund$20Epistemic infrastructuremanifundLightcone Infrastructure
Dec 1, 2024Orpheus LummisManifund$70Epistemic infrastructuremanifundLightcone Infrastructure
Dec 1, 2024Tassilo NeubauerManifund$600Epistemic infrastructuremanifundLightcone Infrastructure
Nov 30, 2024Andrew GManifund$108Epistemic infrastructuremanifundLightcone Infrastructure
Nov 30, 2024drethelin$150,000Epistemic infrastructureorg_reportedopening our fundraiser with a $150,000 donation
Oct 30, 2024Jaan TallinnSurvival and Flourishing Fund$513,500Epistemic infrastructuresffGeneral support
Oct 25, 2024Jaan TallinnCenter for Applied Rationality$1,720,000Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
Oct 25, 2024Jaan TallinnCenter for Applied Rationality$200,000Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
Oct 5, 2024SmittyManifund$155Epistemic infrastructuremanifundLightcone Infrastructure
Oct 2024EA Infrastructure FundEA Funds$250,000EA infrastructureea_fundsSupport for LessWrong.com, Lighthaven.space and other infrastructure that improves humanity's epistemics and long-term future
Sep 17, 2024aysjaManifund$200Epistemic infrastructuremanifundLightcone Infrastructure
Sep 13, 2024EA Community ChoiceManifund$24,628Epistemic infrastructuremanifundLightcone Infrastructure
Sep 5, 2024Aaron LehmannManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Sep 5, 2024Mikhail SaminManifund$50Epistemic infrastructuremanifundLightcone Infrastructure
Sep 5, 2024David KastenManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Oliver HabrykaManifund$750Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Peter BurnsManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Nate SoaresManifund$200Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Ross NordbyManifund$1,000Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Rafe KennedyManifund$400Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Mateusz BagińskiManifund$60Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Luke StebbingManifund$1,000Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Ben Weinstein-RaunManifund$300Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Ravi ParikhManifund$500Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024151d526c-af35-4f14-8c78-23f54ff24bbcManifund$250Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Cameron HolmesManifund$50Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Girl LichManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Joshua DavidManifund$10Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Michael DickensManifund$200Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024DRAKE MORRISONManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024ShaunaManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Sep 4, 2024Max HowaldManifund$500Epistemic infrastructuremanifundLightcone Infrastructure
Sep 3, 2024Garrett BakerManifund$145Epistemic infrastructuremanifundLightcone Infrastructure
Sep 1, 2024Elizabeth Van NostrandManifund$700Epistemic infrastructuremanifundLightcone Infrastructure
Aug 30, 2024Michaël Rubens TrazziManifund$10Epistemic infrastructuremanifundLightcone Infrastructure
Aug 29, 2024Isabel JuniewiczManifund$300Epistemic infrastructuremanifundLightcone Infrastructure
Aug 28, 2024aNK555Manifund$60Epistemic infrastructuremanifundLightcone Infrastructure
Aug 27, 2024N.C. YoungManifund$50Epistemic infrastructuremanifundLightcone Infrastructure
Aug 23, 2024Eli LiflandManifund$600Epistemic infrastructuremanifundLightcone Infrastructure
Aug 23, 2024Alex VeshevManifund$50Epistemic infrastructuremanifundLightcone Infrastructure
Aug 22, 2024Johannes C. MayerManifund$200Epistemic infrastructuremanifundLightcone Infrastructure
Aug 22, 2024Case SandbergManifund$50Epistemic infrastructuremanifundLightcone Infrastructure
Aug 22, 2024Neel NandaManifund$50Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Pat Scott 🩴Manifund$20Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Simon FischerManifund$68Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Steven ByrnesManifund$610Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024julia perssonManifund$300Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Aleph CoinManifund$300Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Sapphire StarManifund$600Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Judd RosenblattManifund$142Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Ross Rheingans-YooManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Zach Stein-PerlmanManifund$250Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Adam SchollManifund$500Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Alex PalcuieManifund$20Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Anton MakiievskyiManifund$200Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Isaac DunnManifund$160Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Jacob Goldman-WetzlerManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Daniel HnykManifund$500Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Andy MartinManifund$1,100Epistemic infrastructuremanifundLightcone Infrastructure
Aug 21, 2024Martin MilbradtManifund$100Epistemic infrastructuremanifundLightcone Infrastructure
Jul 11, 2024Jaan TallinnSurvival and Flourishing Fund$240,000Epistemic infrastructurejaan_onlineFor general operating support
Jun 11, 2024Daniel FilanManifund$10Epistemic infrastructuremanifundLightcone Infrastructure
May 23, 2024Jaan TallinnSurvival and Flourishing Fund$180,000Epistemic infrastructurejaan_onlineGeneral support
May 10, 2024Nick FitzManifund$25Epistemic infrastructuremanifundLightcone Infrastructure
May 10, 2024Chris LakinManifund$500Epistemic infrastructuremanifundLightcone Infrastructure
May 9, 2024Austin ChenManifund$5,000Epistemic infrastructuremanifundLightcone Infrastructure
2024Jaan TallinnSurvival and Flourishing Fund$1,720,000Epistemic infrastructuresffGeneral support of Lightcone Infrastructure
2024Jaan TallinnSurvival and Flourishing Fund$200,000Epistemic infrastructuresffGeneral support of flexHEG prototyping
Nov 30, 2023Jaan TallinnCenter for Applied Rationality$160,000Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
Oct 26, 2023Jaan TallinnSurvival and Flourishing Fund$410,000Research hubssffGeneral Support of Lightcone Infrastructure
Oct 2023Coefficient Giving$2,960,000Other existential riskcoefficient_givingGeneral Support
Jul 11, 2023Jaan TallinnCenter for Applied Rationality$250,000Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
Apr 28, 2023Jaan TallinnSurvival and Flourishing Fund$1,733,000Research hubssffGeneral Support of Lightcone Infrastructure
2023Scott Alexander$100,000Epistemic infrastructureorg_reportedScott Alexander who graciously donated $100,000
2023Vitalik Buterin$1,000,000Epistemic infrastructureorg_reportedVitalik Buterin and Jed McCaleb who each contributed $1,000,000 in 2023
2023Patrick LaVictoire$50,000Epistemic infrastructureorg_reportedPatrick LaVictoire who donated $50,000
Dec 8, 2022Jaan TallinnCenter for Applied Rationality$600,000Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
Dec 2022Jaan TallinnSurvival and Flourishing Fund$1,000,000Research hubssffGeneral Support of Lightcone Infrastructure
Sep 2022Coefficient Giving$4,500,000Other existential riskcoefficient_givingGeneral Support
Aug 18, 2022Jaan TallinnCenter for Applied Rationality$400,000Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
Jul 8, 2022Jaan TallinnCenter for Applied Rationality$13,800Epistemic infrastructurejaan_onlineGeneral support for Lightcone Infrastructure
2022FTX Future Fund$2,000,000Epistemic infrastructureftx_future_fundWe recommended a grant to support Lightcone’s ongoing projects including running the LessWrong forum, hosting conferences and events, and maintaining an office space for Effective Altruist organizations. — Artificial Intelligence, Effective Altruism
Nov 20, 2021Casey and Family FoundationSurvival and Flourishing Fund$500,000Research hubssffGeneral Support of Lightcone Infrastructure
Nov 20, 2021Jaan TallinnSurvival and Flourishing Fund$380,000Research hubssffGeneral Support of Lightcone Infrastructure
Jul 2021Jaan TallinnSurvival and Flourishing Fund$1,055,000Research hubssffGeneral Support of LessWrong
May 2021Coefficient Giving$460,000Other existential riskcoefficient_givingGeneral Support
Jun 2020Jaan TallinnSurvival and Flourishing Fund$290,000Research hubssffGeneral Support of LessWrong
Jun 2020Jed McCalebSurvival and Flourishing Fund$30,000Research hubssffGeneral Support of LessWrong
Jun 2020Jaan TallinnSurvival and Flourishing Fund$110,000Research hubssffGeneral Support of LessWrong
Apr 2020Coefficient Giving$300,000Other existential riskcoefficient_givingGeneral Support
Sep 30, 2019Jaan TallinnSurvival and Flourishing Fund$260,000Epistemic infrastructurevipul_donations
Sep 4, 2018Jaan TallinnBerkeley Existential Risk Initiative$150,000Epistemic infrastructurejaan_onlineGeneral support for activities to develop and improve the website LessWrong 2.0
Feb 8, 2018Jaan TallinnBerkeley Existential Risk Initiative$100,000Epistemic infrastructurejaan_onlineGeneral support for activities to develop and improve the website LessWrong 2.0
Sep 29, 2017Effective Altruism Grants$6,900EA infrastructurevipul_donationsWork on in-person and/or online community infrastructure for the rationality and EA communities. This will primarily take the form of helping to develop the new version of the rationality forum LessWrong, with others projects, like Europeans workshops encouraging long-term collaboration between EAs, under consideration. See http://effective-altruism.com/ea/1fc/effective_altruism_grants_project_update/ for more context about the grant program.
Sep 29, 2017Effective Altruism Grants$78,814Global health and developmentvipul_donationsDevelopment of the new version of the rationality forum LessWrong. He and a partner will improve its moderation system, codebase and design, as well as incentivize top contributors to post on the new platform. See http://effective-altruism.com/ea/1fc/effective_altruism_grants_project_update/ for more context about the grant program.
Sep 14, 2017Eric Rogstad$10,000Epistemic infrastructurevipul_donations

* Lightcone Infrastructure said it needed about $2m for the year in the fundraiser it launched on 13 December 2025; no closing total was posted, so the round is estimated at $2m and the $145,000 of donations recorded individually in this database is subtracted.

† Lightcone Infrastructure reported raising over $2.1m when its 2024–25 LessWrong + Lighthaven fundraiser closed on 19 January 2025; the $187,212 of fundraiser donations recorded individually in this database is subtracted from that total.

As fiscal sponsor 8 · $1,743,000 · $217,875 average

Date ↓FunderRecipientViaAmountCauseSourcePurpose
Sep 2026Jaan TallinnGD ResearchSurvival and Flourishing Fund$100,000OthersffGeneral support of GD Research
Sep 2026Jaan TallinnMissing MeasuresSurvival and Flourishing Fund$70,000EvalssffGeneral support of Missing Measures
Sep 2026Dustin MoskovitzMissing MeasuresSurvival and Flourishing Fund$206,000EvalssffGeneral support of Missing Measures
Sep 2025Jaan TallinnDavid LorellSurvival and Flourishing Fund$230,000Technical AI safety researchsffGeneral support of research led by David Lorrell
Sep 2025Jaan TallinnMissing MeasuresSurvival and Flourishing Fund$338,000Technical AI safety researchsffGeneral support of Missing Measures
Sep 2025Jaan TallinnJohn WentworthSurvival and Flourishing Fund$258,000FoundationssffGeneral support of research led by John Wentworth
Sep 2025Jaan TallinnAI Lab WatchSurvival and Flourishing Fund$371,000OthersffGeneral support of AI Lab Watch
Oct 30, 2024Jaan TallinnMacrostrategy Research InitiativeSurvival and Flourishing Fund$170,000EvalssffGeneral support of Macrostrategy Research Initiative