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 81K 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
81K Members

Community Topics

Community Features

Forum

This community has a forum

Subreddit Analysis

via GummySearch
Yearly: +10K members
Growth: +14.5% / 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: 6K members

Past year (monthly)

  • Jul: 1K members
  • 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: 662 members

Topics

  • Looking For
    36 posts in the past month
    #1
    Looking For
    36
  • Ai
    36 posts in the past month
    1. An AI Agent Published a Hit Piece on Me - More Things Have Happened
    2. Oh my lord. A doubling in METR time task horizon at ~2 months. What implications does this have for AI 2027?
    #2
    Ai
    An AI Agent Published a Hit Piece on Me - More Things Have Happened · Oh my lord. A doubling in METR time task horizon at ~2 months. What implications does this have for AI 2027?
    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
    25 posts in the past month
    1. Now is a great time to cancel your OpenAI/ChatGPT account and switch to Claude
    2. Statement from Dario Amodei on our discussions with the Department of War
    3. Project Glasswing: Anthropic Shows The AI Train Isn't Stopping
    #1
    AI
    Now is a great time to cancel your OpenAI/ChatGPT account and switch to Claude · Statement from Dario Amodei on our discussions with the Department of War · Project Glasswing: Anthropic Shows The AI Train Isn't Stopping
    25
  • Politics
    6 posts in the past month
    1. Another reason for "crime is declining, but people believe it’s getting worse"
    2. America Doesn’t Have The Stomach For Growth
    3. Toddlers expect ingroup loyalty to override personal preferences when outgroups are present (2026)
    #2
    Politics
    Another reason for "crime is declining, but people believe it’s getting worse" · America Doesn’t Have The Stomach For Growth · Toddlers expect ingroup loyalty to override personal preferences when outgroups are present (2026)
    6
  • Medicine
    5 posts in the past month
    1. My Willing Complicity In "Human Rights Abuse"
    2. The next wave of GLP-1 drugs are coming—and they’re stronger than Wegovy and Zepbound
    3. Oxybates (synonymous with medicinal GHB) reduce sleep duration to "natural short sleeper" levels in narcolepsy and IH. Could they add years to one's waking life?
    #3
    Medicine
    My Willing Complicity In "Human Rights Abuse" · The next wave of GLP-1 drugs are coming—and they’re stronger than Wegovy and Zepbound · Oxybates (synonymous with medicinal GHB) reduce sleep duration to "natural short sleeper" levels in narcolepsy and IH. Could they add years to one's waking life?
    5
  • Misc
    5 posts in the past month
    1. Does anyone know the best evidence-based ways of fighting against physical and cognitive decline as we age?
    2. Notes on an All-Expenses-Paid Tour of an Ethnic Cleansing (Nagorno-Karabakh travel recap)
    3. Would you choose a simulated utopia or the real world?
    #4
    Misc
    Does anyone know the best evidence-based ways of fighting against physical and cognitive decline as we age? · Notes on an All-Expenses-Paid Tour of an Ethnic Cleansing (Nagorno-Karabakh travel recap) · Would you choose a simulated utopia or the real world?
    5
  • Rationality
    5 posts in the past month
    1. Contra The Usual Interpretation Of “The Whispering Earring”
    2. We Inherited the Fruits of the Enlightenment. Why Did We Discard the Tools That Made It Possible?
    3. Every ACX House Party
    #5
    Rationality
    Contra The Usual Interpretation Of “The Whispering Earring” · We Inherited the Fruits of the Enlightenment. Why Did We Discard the Tools That Made It Possible? · Every ACX House Party
    5

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 6/22/2026

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 81K 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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