r/slatestarcodex

Community Overview
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About r/slatestarcodex

Slate Star Codex was the former name for a blog by Scott Alexander about human cognition, politics, and medicine. In 2021, the name was changed to Astral Codex Ten: https://astralcodexten.substack.com/

The community at a glance

r/slatestarcodex is a Subreddit for Longevity Enthusiasts and Biohackers with roughly 82K members. It uses a forum format for communication. It is the 4th largest community in the Biohacking topic page and the 9th largest community in the Longevity topic page.

Roughly 10K members have joined in the past year. Popular discussion topics include Looking For, Ai, and Worst. Product recommendations often mention book.

On Reddit
82K Members

Community Topics

Community Features

Forum

This community has a forum

Subreddit Analysis

via GummySearch
Yearly: +10K members
Growth: +14.0% / year

Member growth over time

All time (yearly)

  • 2015: 1K members
  • 2016: 2K members
  • 2017: 4K members
  • 2018: 6K members
  • 2019: 10K members
  • 2021: 22K members
  • 2023: 14K members
  • 2024: 7K members
  • 2025: 8K members
  • 2026: 7K members

Past year (monthly)

  • Aug: 517 members
  • Sep: 438 members
  • Oct: 514 members
  • Nov: 607 members
  • Dec: 969 members
  • Jan: 848 members
  • Feb: 679 members
  • Mar: 821 members
  • Apr: 870 members
  • May: 2K members
  • Jun: 867 members
  • Jul: 541 members

Topics

  • Looking For
    36 posts in the past month
    #1
    Looking For
    36
  • Ai
    36 posts in the past month
    #2
    Ai
    36
  • Worst
    11 posts in the past month
    #3
    Worst
    11
  • Philosophy
    9 posts in the past month
    #4
    Philosophy
    9
  • Technology
    8 posts in the past month
    #5
    Technology
    8

Flair

  • AI
    7 posts in the past month
    1. Reinforcement Learning on Forecasting will give us a Superhuman Forecaster
    2. How close are LLMs now to copying Scott's style?
    3. Does anyone still think AGI/ASI could happen very soon?
    #1
    AI
    Reinforcement Learning on Forecasting will give us a Superhuman Forecaster · How close are LLMs now to copying Scott's style? · Does anyone still think AGI/ASI could happen very soon?
    7
  • Medicine
    4 posts in the past month
    1. Ending respiratory infections
    2. View from the Shifting Mound — on complex trauma, dissociative state, and multiple personalities
    3. View from the Shifting Mound — on complex trauma, dissociative state, and multiple personalities
    #2
    Medicine
    Ending respiratory infections · View from the Shifting Mound — on complex trauma, dissociative state, and multiple personalities · View from the Shifting Mound — on complex trauma, dissociative state, and multiple personalities
    4
  • Rationality
    4 posts in the past month
    1. I Just Say Yes: Notes on losing my thinking to AI, and one idea for fighting it
    2. "The Inside Story Of Leverage Research 1.0: Between 2011-2019, Leverage Research explored the deep psychology of Effective Altruism and Silicon Valley, then suddenly dissolved among rumors of 'demons'. What happened?", Lydia Laurenson 2026-07-01
    3. Frame Error: The Third Kind of Mistake
    #3
    Rationality
    I Just Say Yes: Notes on losing my thinking to AI, and one idea for fighting it · "The Inside Story Of Leverage Research 1.0: Between 2011-2019, Leverage Research explored the deep psychology of Effective Altruism and Silicon Valley, then suddenly dissolved among rumors of 'demons'. What happened?", Lydia Laurenson 2026-07-01 · Frame Error: The Third Kind of Mistake
    4
  • Meta
    2 posts in the past month
    1. "Scott Alexander as a modern-day Edmund Wilson"
    2. slatestar/lesswrong were early on AI safety and prediction markets .... what's next that the public is still sleeping on?
    #4
    Meta
    "Scott Alexander as a modern-day Edmund Wilson" · slatestar/lesswrong were early on AI safety and prediction markets .... what's next that the public is still sleeping on?
    2
  • Science
    1 post in the past month
    1. Where to Find the Colors Your Screen Can’t Show You
    #5
    Science
    Where to Find the Colors Your Screen Can’t Show You
    1

Product recommendations

  • book
    13 posts in the past month
    1. Best book on Bayesian thinking
    2. What are the best 1-3 books I can read to be able to learn to spot, point out and name fallacies, illogical and magical thinking, evasion tactics, rhetoric, et cetera?
    3. Best non-fiction book(s) you have read this year?
    #1
    book
    Best book on Bayesian thinking · What are the best 1-3 books I can read to be able to learn to spot, point out and name fallacies, illogical and magical thinking, evasion tactics, rhetoric, et cetera? · Best non-fiction book(s) you have read this year?
    13
View full analysis on GummySearchSynced 7/6/2026

Frequently asked questions

Who is r/slatestarcodex for?
Best for Longevity Enthusiasts and Biohackers enthusiasts looking for a Reddit-based community with forum discussion.
Is r/slatestarcodex free to join?
This listing is not marked as paid-only. Access rules and any fees are decided by the community.
How many members does r/slatestarcodex have?
Roughly 82K members, based on figures reported by the community or its host. Member counts are approximate and change over time.
What platform is r/slatestarcodex on?
r/slatestarcodex runs on Reddit. Reddit communities (or "subreddits") are forum-based groups on the popular social news aggregation, web content rating, and discussion website Reddit. Reddit is commonly known as "the front page of the internet". Users submit content to the site such as links, text posts, and images, which are then voted up or down and discussed by other members. From investing Reddit communities, to professional ones, to ones just for laughs, you're likely to find a community for you on Reddit.
What topics does r/slatestarcodex cover?
On the Hive Index, r/slatestarcodex is organized under Longevity Enthusiasts, Biohackers.
How do I join r/slatestarcodex?
You can join r/slatestarcodex by clicking this link, or pressing the "Go to community" button above.
What are the Longevity communities like?
Communities for people interested in extending healthspan and lifespan through science-backed interventions. You will find research-focused forums, protocol-follower communities on Skool, and spaces around metabolic health monitoring and the latest biotech developments in the longevity field.
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Added 5/19/2026

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