ClaimsPeople

Scott Alexander

Scott Alexander is a writer known for his blogs Astral Codex Ten and Slate Star Codex and for fiction including Unsong.

775 claims collected, 234 researched, 81 resolved. Report of 4 November 2026, method 0.1.0+8bea457b.

Scores by kind of claim

Each kind of claim is scored on its own, out of 100: the share that held up, with the range it likely falls in. Fewer resolved claims give a wider range.

  • Factual claims

    Statements about the present or the past, checked against the record: did they hold up?

    80 72 88

    Medium confidence, 35 factual claims resolved. From 10 documents, 2014 to 2026; 15 documents sampled from 35 candidates found.

    Not scored: 46 unresolvable, 9 checkable only against their own records.

  • Predictions

    Statements about events outside the person's control, checked once they fell due: did they come true?

    70 62 78

    Medium confidence, 44 predictions resolved. From 7 documents, 2016 to 2025; 15 documents sampled from 35 candidates found.

    Not scored: 67 unresolvable, 10 checkable only against their own records. 19 more fall due later.

    Does not yet allow for how likely each prediction was when made.

  • Promises

    Commitments to the person's or organisation's own future action, with something to deliver: was it delivered?

    Insufficient record: 2 promises resolved, 5 needed for a score.

All types combined: 75 (likely 69 to 80, high confidence), from 79 claims: 35 factual claims, 44 predictions. It mixes kinds of claim in different proportions for different people, so compare people kind by kind.

Scott Alexander's claims

90 claims, sorted by newest said. Choose a claim to read it in full.
VerdictKindSaidClaimTopic
Unresolvable Factual 19 Oct 2026 MNX lets people sell futures representing AI company stocks, bet on AI company revenues, and trade on targets such as the Epoch Capabilities Index. Factual · 19 Oct 2026 Economics and markets
Mostly true Factual 19 Oct 2026 MNX, a project of Manifold Markets co-founder Stephen Grugett, is a real-money prediction market on AI. Factual · 19 Oct 2026 Economics and markets
Resolved true Factual 19 Oct 2026 Goodheart Labs is working on Common Notes, described as Twitter Community Notes but for everything. Factual · 19 Oct 2026 Technology
Unresolvable Factual 19 Oct 2026 An alternate survey asks respondents to predict how Scott Alexander would answer the first survey, to separate worldview differences from random noise. Factual · 19 Oct 2026 Their own work or organisation
Unresolvable Factual 19 Oct 2026 Common Notes is implemented through AIs writing most notes, users writing and voting on notes, and a browser extension that shows the system on any site, including ACX. Factual · 19 Oct 2026 AI capabilities
Unresolvable Factual 19 Oct 2026 ACX meetups in Rockville, Northampton, Eindhoven, Great Barrington, Cairo, Portland and Sofia have had changes announced as of October 2026. Factual · 19 Oct 2026 Their own work or organisation
Unresolvable Factual 19 Oct 2026 ACX's main San Francisco endorsement for the 2026 election is Scott Wiener for Congress. Factual · 19 Oct 2026 Their own work or organisation
Unresolvable Factual 19 Oct 2026 The Boston ACX meetup group has finished its Greater Boston general election voting guide. Factual · 19 Oct 2026 Their own work or organisation
Own records only Factual 19 Oct 2026 Scott Alexander is continuing to work on modeling, and maybe later automating, parts of AI grantmaking. Factual · 19 Oct 2026 Their own work or organisation
Mostly true Factual 5 Oct 2026 Reader Nikita Sokolsky has finished obtaining extra Fatima documents from Portugal and translating them into English. Factual · 5 Oct 2026 Their own work or organisation
Unresolvable Factual 5 Oct 2026 Most Astral Codex Ten content is free and some is subscriber-only. Factual · 5 Oct 2026 Their own work or organisation
Unresolvable Factual 5 Oct 2026 Scott Alexander has written little recently on ACX and forgot to post Friday's book review entry. Factual · 5 Oct 2026 Their own work or organisation
Resolved true Factual 5 Oct 2026 Rob Ennals, who made this year's ACX book review contest site, has gathered reviews from earlier years into epubs. Factual · 5 Oct 2026 Their own work or organisation
Mostly true Factual 5 Oct 2026 Physicians For AI Safety exists, wants to talk to physicians interested in AI safety, and has an open letter such people can sign. Factual · 5 Oct 2026 Field building and careers
Unresolvable Factual 5 Oct 2026 Astral Codex Ten has an unofficial subreddit, Discord and bulletin board, and in-person meetups around the world. Factual · 5 Oct 2026 Their own work or organisation
Own records only Factual 3 Apr 2025 Scott Alexander discovers a new blogger he is super excited about about once a year. Factual · 3 Apr 2025 Their own work or organisation
Own records only Factual 3 Apr 2025 Typically about 1% of the people who read a blog's viral hit stick around as regular readers, based on Slate Star Codex's early growth. Factual · 3 Apr 2025 Their own work or organisation
Unresolvable Factual 3 Apr 2025 All humans are descended from groups that exterminated other groups, and most groups throughout history have been wiped out. Factual · 3 Apr 2025 Philosophy, ethics and society
Unresolvable Factual 3 Apr 2025 The general research speedup multiplier today is about a thousand times that of the Paleolithic era. Factual · 3 Apr 2025 Economics and markets
Mostly true Factual 3 Apr 2025 Through history, people have been reluctant to admit an AI is truly intelligent. Factual · 3 Apr 2025 Philosophy, ethics and society
Unresolvable Factual 3 Apr 2025 Scott Alexander said that after he moved his blog to WordPress, it received orders of magnitude more attention. Factual · 3 Apr 2025 Their own work or organisation
Unresolvable Factual 3 Apr 2025 Speaking about Elon Musk and SpaceX, he said he thought that in 2000 people would not have expected that someone could move two or five times faster than NASA with fairly limited resources. Factual · 3 Apr 2025 Economics and markets
Resolved true Factual 3 Apr 2025 Nvidia originally came from gaming. Factual · 3 Apr 2025 Economics and markets
Resolved true Factual 3 Apr 2025 Scott Alexander said he thinks the AI alignment community did not really expect LLMs. Factual · 3 Apr 2025 AI safety and alignment
Unresolvable Factual 3 Apr 2025 The AI 2027 scenario existed at an early stage as a giant spreadsheet and had not yet been written up. Factual · 3 Apr 2025 AI timelines and forecasting
Unresolvable Factual 10 Dec 2024 Scott Alexander cited the superiority of police deterrence over prison as an argument that lets the discussion sidestep the retribution issue. Factual · 10 Dec 2024 Philosophy, ethics and society
Own records only Factual 10 Dec 2024 Scott Alexander limited how much he discussed punishment-as-retribution in his original prison post because it is a culture-war scissor topic. Factual · 10 Dec 2024 Philosophy, ethics and society
Resolved true Factual 10 Dec 2024 Solitary confinement for prisoners might be more expensive than standard imprisonment. Factual · 10 Dec 2024 Philosophy, ethics and society
Resolved true Factual 10 Dec 2024 Following Roodman, Scott's original cost-benefit analysis of prison gave two conclusions: one counting prisoners' own suffering and one not. Factual · 10 Dec 2024 Philosophy, ethics and society
Mostly true Factual 10 Dec 2024 Most of the benefits of prison come from incapacitation rather than deterrence. Factual · 10 Dec 2024 Philosophy, ethics and society
Unresolvable Factual 10 Dec 2024 Scott Alexander relays that someone with experience in the field told him there are some problems with hiring police, such as requiring everyone who works in law enforcement to start as a beat cop. Factual · 10 Dec 2024 Other
Resolved true Factual 10 Dec 2024 Last month's issue of Asterisk (November 2024) contains an interview with Skarbek, which Scott thinks will be online shortly. Factual · 10 Dec 2024 Their own work or organisation
Resolved true Factual 10 Dec 2024 In the original post, Scott said that although murder was down in El Salvador, the statistics didn't really show a decline in theft. Factual · 10 Dec 2024 Other
Resolved true Factual 20 Feb 2023 As of 2023 the technology to offer polygenic scores to consumers definitely exists. Factual · 20 Feb 2023 Technology
Unresolvable Factual 20 Feb 2023 The Ukraine war was the biggest geopolitical story of 2018-2023, and Scott Alexander's 2018 predictions did not anticipate it. Factual · 20 Feb 2023 Their own work or organisation
Unresolvable Factual 20 Feb 2023 Scott Alexander said his biggest failure was item 10 of his 2018 predictions, where he gave Roe v. Wade only a 1% chance of being overturned. Factual · 20 Feb 2023 Their own work or organisation
Mostly true Factual 20 Feb 2023 As of early 2023 nobody is talking about technological unemployment, because unemployment rates are historically low. Factual · 20 Feb 2023 AI, the economy and work
Mostly true Factual 20 Feb 2023 impute.me may provide the consumer polygenic score service Scott Alexander predicted, but it has made no public waves. Factual · 20 Feb 2023 Technology
Unresolvable Factual 20 Feb 2023 As far as he could tell, writing in February 2023, none of the space tourism developments he had discussed had worked out, and the field seemed stuck in the same limbo as for the past decade and a half. Factual · 20 Feb 2023 Technology
Resolved true Factual 20 Feb 2023 In 2018 Scott Alexander partly abandoned his usual clear-resolution probabilistic predictions for rough guesses in his five-year predictions. Factual · 20 Feb 2023 Their own work or organisation
Unresolvable Factual 14 Mar 2022 Scott Alexander said that in February 2022 he had discussed problems with the Metaculus leaderboard. Factual · 14 Mar 2022 Their own work or organisation
Resolved true Factual 14 Mar 2022 In February 2022 Scott Alexander suggested that Manifold Markets add a loan feature to boost investment in long-term markets. Factual · 14 Mar 2022 Their own work or organisation
Mostly true Factual 14 Mar 2022 The probability shown in the chart in the post was almost monotonically decreasing, lower each day than the day before. Factual · 14 Mar 2022 Other global risks
Unresolvable Factual 14 Mar 2022 Scott Alexander said that, if he understood it right, in the study the average forecaster did worse than the average expert, but Tetlock used clever aggregation methods for his superforecasters while the CIA did not use such methods for its experts. Factual · 14 Mar 2022 Science and research methods
Resolved true Factual 14 Mar 2022 A team described as some of the best superforecasters in the world won the CSET-Foretell forecasting competition by a large margin, described as around twice as good as the next-best team in relative Brier score. Factual · 14 Mar 2022 Science and research methods
Mostly true Factual 14 Mar 2022 Early in the Russia-Ukraine war prediction markets gave Ukraine poor odds, and by March 2022 they were much more optimistic about Ukraine. Factual · 14 Mar 2022 Other global risks
Unresolvable Factual 14 Feb 2021 The NYT journalist has not known about Slate Star Codex for three years, so he read the edited version of the Voldemort post that told people not to take it out of context. Factual · 14 Feb 2021 Their own work or organisation
Mixed Factual 14 Feb 2021 The NYT's original pitch was interest in how Scott Alexander warned early about the coronavirus pandemic and urged mask-wearing before it was standard advice. Factual · 14 Feb 2021 Their own work or organisation
Unresolvable Factual 14 Feb 2021 Scott Alexander's Contra Grant post states "My research suggests no average gender difference in ability". Factual · 14 Feb 2021 Their own work or organisation
Mostly true Factual 14 Feb 2021 Scott Alexander said the NYT's characterisation was true only insofar as he once expressed agreement with an unrelated Charles Murray position: that telling poor people to learn to code is insufficient and a stable income is needed. Factual · 14 Feb 2021 Their own work or organisation
Unresolvable Factual 14 Feb 2021 Scott Alexander received support from Steven Pinker, Larry Sanger, Jonathan Haidt, Liv Boeree and Yascha Mounk. Factual · 14 Feb 2021 Their own work or organisation
Own records only Factual 14 Feb 2021 Scott Alexander was warned by people "in the know" that the NYT would publish something as negative as possible about him once it had an excuse. Factual · 14 Feb 2021 Their own work or organisation
Mixed Factual 14 Feb 2021 In early 2020, Scott Alexander learned the New York Times wanted to write an article about him. Factual · 14 Feb 2021 Their own work or organisation
Mixed Factual 14 Feb 2021 Scott Alexander wrote a 30,000-word condemnation of one of the right-wing figures named in the article on his blog a few years ago. Factual · 14 Feb 2021 Their own work or organisation
Own records only Factual 14 Feb 2021 Scott Alexander met Peter Thiel once at a party, long before Trump was in the news, and exchanged about two sentences with him. Factual · 14 Feb 2021 Their own work or organisation
Resolved true Factual 14 Feb 2021 Scott Alexander has never personally been involved in the tech industry. Factual · 14 Feb 2021 Their own work or organisation
Unresolvable Factual 21 Jan 2021 Scott Alexander quit his day job so his employer would not be affected by the fallout. Factual · 21 Jan 2021 Their own work or organisation
Unresolvable Factual 21 Jan 2021 Trolls posted Scott Alexander's real name in many places after he tried to protect his anonymity. Factual · 21 Jan 2021 Their own work or organisation
Own records only Factual 21 Jan 2021 Scott Alexander lost a five-digit sum in advertising and Patreon fees. Factual · 21 Jan 2021 Their own work or organisation
Unresolvable Factual 21 Jan 2021 Scott Alexander deleted his blog, which had 1,557 posts. Factual · 21 Jan 2021 Their own work or organisation
Unresolvable Factual 21 Jan 2021 While trying to restore his blog, Scott Alexander accidentally sent about three hundred emails to each of five thousand people. Factual · 21 Jan 2021 Their own work or organisation
Unresolvable Factual 21 Jan 2021 After Scott Alexander deleted his blog, articles about him appeared in the New Yorker, Reason, and The Daily Beast. Factual · 21 Jan 2021 Their own work or organisation
Own records only Factual 24 Jun 2020 The New York Times reporter told Scott Alexander that his editor absolutely prohibited writing the story without Alexander's real name and that the reporter considered the story too important to drop. Factual · 24 Jun 2020 Their own work or organisation
Own records only Factual 24 Jun 2020 Scott Alexander discussed with the New York Times reporter why he wanted his real name left out of the story, saying largely what he said in his public post. Factual · 24 Jun 2020 Their own work or organisation
Unresolvable Factual 22 Jan 2019 Of his 2018 predictions at 80%, Scott Alexander got 10 right and 3 wrong, a score of 77%. Factual · 22 Jan 2019 Their own work or organisation
Unresolvable Factual 22 Jan 2019 Of his 2018 predictions at 60%, Scott Alexander got 8 right and 7 wrong, a score of 53%. Factual · 22 Jan 2019 Their own work or organisation
Unresolvable Factual 22 Jan 2019 Of his 2018 predictions at 95%, Scott Alexander got 6 right and 2 wrong, a score of 75%. Factual · 22 Jan 2019 Their own work or organisation
Unresolvable Factual 22 Jan 2019 At the 95% confidence level, Scott Alexander's 2018 predictions came out only 75% correct. Factual · 22 Jan 2019 Their own work or organisation
Mostly true Factual 22 Jan 2019 Scott Alexander made predictions in February 2018 for the next five years. Factual · 22 Jan 2019 Their own work or organisation
Mostly true Factual 22 Jan 2019 Cryptocurrency crashed during 2018, after Bitcoin was around $15,000 when Scott Alexander made his 2018 predictions. Factual · 22 Jan 2019 Economics and markets
Unresolvable Factual 22 Jan 2019 Scott Alexander made many correlated cryptocurrency predictions for 2018, which therefore scored badly. Factual · 22 Jan 2019 Their own work or organisation
Unresolvable Factual 6 Jan 2017 Scott Alexander makes predictions at the beginning of every year. Factual · 6 Jan 2017 Their own work or organisation
Unresolvable Factual 31 Dec 2016 Setting aside the 50% bin, which he called meaningless, Scott Alexander said his main calibration deviation in 2016 was some underconfidence at the 70% level. Factual · 31 Dec 2016 Science and research methods
Unresolvable Factual 31 Dec 2016 Of his 2016 predictions made at 50% confidence, Scott Alexander got 8 right and 5 wrong, a score of 62%. Factual · 31 Dec 2016 Their own work or organisation
Unresolvable Factual 31 Dec 2016 Looking back at his 2014, 2015 and 2016 predictions, Scott Alexander said he is probably generally a little underconfident in medium-probability predictions. Factual · 31 Dec 2016 Science and research methods
Unresolvable Factual 31 Dec 2016 Scott Alexander makes predictions at the start of every year and scores them at the end of every year. Factual · 31 Dec 2016 Their own work or organisation
Mostly true Factual 25 Jan 2016 Scott Alexander makes predictions at the start of every year and scores them at the end of each year. Factual · 25 Jan 2016 Their own work or organisation
Unresolvable Factual 30 Sep 2014 The Implicit Association Test is one of the ways we know racism is a giant all-encompassing social factor. Factual · 30 Sep 2014 Philosophy, ethics and society
Resolved true Factual 30 Sep 2014 A recent Implicit Association Test study using political parties found unconscious partisan biases were about 1.5 times as strong as unconscious racial biases. Factual · 30 Sep 2014 Science and research methods
Unresolvable Factual 30 Sep 2014 In every US election cycle, liberals give unconvincing denials of the accusation that they are not sufficiently pro-America. Factual · 30 Sep 2014 Philosophy, ethics and society
Mostly true Factual 30 Sep 2014 The Nazis' outgroup was the almost-identical German Jews rather than the culturally distant Japanese. Factual · 30 Sep 2014 Philosophy, ethics and society
Mostly true Factual 30 Sep 2014 Estimates of the genetic contribution to political association range from 0.4 to 0.6. Factual · 30 Sep 2014 Science and research methods
Mostly true Factual 30 Sep 2014 Heritability of attitudes toward gay rights is estimated at 0.3 to 0.5, slightly higher than the heritability of homosexuality. Factual · 30 Sep 2014 Science and research methods
Unresolvable Factual 30 Sep 2014 In every US election cycle, conservatives accuse liberals of not being sufficiently pro-America. Factual · 30 Sep 2014 Philosophy, ethics and society
Unresolvable Factual 30 Sep 2014 In a Reddit thread of 10,401 comments asking for people against gay marriage, the author found only two commenters who opposed it, near the bottom. Factual · 30 Sep 2014 Philosophy, ethics and society
Unresolvable Factual 30 Sep 2014 Scott Alexander's hunch is that both the Red Tribe and the Blue Tribe identify "America" with the Red Tribe. Factual · 30 Sep 2014 Philosophy, ethics and society
Mostly true Factual 30 Sep 2014 Researchers have studied belief congruence theory, that belief differences matter more than demographics in forming in-groups and outgroups, for decades. Factual · 30 Sep 2014 Philosophy, ethics and society
Resolved true Factual 30 Sep 2014 Scott Alexander is a psychiatrist by profession. Factual · 30 Sep 2014 Their own work or organisation
Unresolvable Factual 30 Sep 2014 Every one of the cited articles criticizing America was written by an American and read almost entirely by Americans. Factual · 30 Sep 2014 Philosophy, ethics and society
Unresolvable Factual 30 Sep 2014 The worst reaction Scott Alexander got to a blog post was to his post about the death of Osama bin Laden. Factual · 30 Sep 2014 Their own work or organisation
Back to the list

Factual Economics and markets

“It lets people sell futures representing AI company stocks, bet on AI company revenues directly, and a few other things like Epoch Capabilities Index targets.”

Scott Alexander, ACX author 19 October 2026 Open Thread 456 (Astral Codex Ten)

MNX lets people sell futures representing AI company stocks, bet on AI company revenues, and trade on targets such as the Epoch Capabilities Index.

Unresolvable The public record could not settle it.

The second judge would not resolve this claim; the verdict shown is the first judge's.

What would count as true or false

The claim has three parts. As of 2026-10-19, MNX must let users (a) sell or trade futures representing AI company stocks, (b) bet on AI company revenues, and (c) trade on other targets such as Epoch Capabilities Index thresholds. True if MNX's site, documentation or launch announcement shows all three. Mostly true if all three are present but a minor detail differs, for example the instruments are called contracts rather than futures. Mixed if roughly half the features hold, for example two of the three. Mostly false if only one feature is present. False if MNX offers none of them, or did not exist or operate as described at that date.

Evidence

  1. MegaETH-powered MNX goes live with pre-IPO futures for OpenAI, Anthropic and DeepSeek CoinDesk · 13 October 2026
    “MNX, is a new crypto exchange that offers futures contracts that let investors speculate on the valuations of private artificial intelligence companies including OpenAI, Anthropic, DeepSeek and Moonshot.”
  2. MegaETH-powered MNX goes live with pre-IPO futures for OpenAI, Anthropic and DeepSeek CoinDesk · 13 October 2026
    “MNX also aims to offer markets around the wider AI economy, including company revenue, employment, housing, the AI supply chain and computing capacity.”
  3. MNX Docs MNX Markets, Inc. (MNX Docs) · 28 October 2026
    “Settlement rules for the OPENAI, ANTHROPIC, DEEPSEEK, and MOONSHOT valuation futures.”
  4. MNX MNX Markets, Inc. · 25 September 2026
    “OpenAI + Anthropic 2027 revenue LABREVOpenAI + Anthropic 2027 revenue”

Reasoning

The evidence shows MNX offering valuation futures on AI companies [E1][E3] and a market on AI company revenue [E4], but no evidence item addresses Epoch Capabilities Index markets either way. Without the third feature, the evidence cannot settle whether the claim meets the criteria for mostly true (all three features) or mixed (two of three).

Cite this claim

Scott Alexander, “MNX lets people sell futures representing AI company stocks, bet on AI company revenues, and trade on targets such as the Epoch Capabilities Index.” (said 19 October 2026). Verdict: unresolvable. Reliability API, claim c_081b849183f6, method 0.1.0+8bea457b. https://epistacklabs.com/claims/c_081b849183f6

Claims without a verdict

Is a verdict here wrong, or do you speak for Scott Alexander? Reply on the claim's own page, with the form at its foot (how replies work). Verdicts are made automatically; how verdicts and scores are made.