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 85K members. It uses a forum format for communication. It is the 4th largest community in the Biohacking topic page and the 10th largest community in the Longevity topic page.

Roughly 11K members have joined in the past year. Popular discussion topics include Looking For, Ai, and Worst. Product recommendations often mention book.

On Reddit
85K Members

Community Topics

Community Features

Forum

This community has a forum

Subreddit Analysis

via GummySearch
Yearly: +11K 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: 9K members

Past year (monthly)

  • Dec: 969 members
  • Jan: 848 members
  • Feb: 679 members
  • Mar: 821 members
  • Apr: 870 members
  • May: 2K members
  • Jun: 867 members
  • Jul: 1K members
  • Aug: 703 members
  • Sep: 764 members
  • Oct: 600 members
  • Nov: 236 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
    8 posts in the past month
    1. Sparks of Weight-Space Programming: LLMs can natively read & write neural network weights
    2. Against SURA (Stop Unilaterally, Raise Awareness)
    3. AI alignment - with what?
    #1
    AI
    Sparks of Weight-Space Programming: LLMs can natively read & write neural network weights · Against SURA (Stop Unilaterally, Raise Awareness) · AI alignment - with what?
    8
  • Medicine
    3 posts in the past month
    1. 5 years later, what are your results and opinions of GLP-1 drugs ?
    2. Winter On The Ward
    3. Finance guys first foray into drug discovery
    #2
    Medicine
    5 years later, what are your results and opinions of GLP-1 drugs ? · Winter On The Ward · Finance guys first foray into drug discovery
    3
  • Existential Risk
    2 posts in the past month
    1. From LW: the scale of the AI buildout should make us take existential risks more seriously.
    2. Against SURA: LW post by Scott on the “Stop Unilaterally + Raise Awareness” approach to AI politics
    #3
    Existential Risk
    From LW: the scale of the AI buildout should make us take existential risks more seriously. · Against SURA: LW post by Scott on the “Stop Unilaterally + Raise Awareness” approach to AI politics
    2
  • Rationality
    2 posts in the past month
    1. The sound in your stream that leaks where you live — The Doxicology Report, Case 01
    2. Why do people prefer to die than think?
    #4
    Rationality
    The sound in your stream that leaks where you live — The Doxicology Report, Case 01 · Why do people prefer to die than think?
    2
  • Fiction
    1 post in the past month
    1. The Witching Hour | Slate Star Codex
    #5
    Fiction
    The Witching Hour | Slate Star Codex
    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 11/9/2026

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 85K 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

Monthly Stats

17
Views /mo
(+21%)
16
Visitors /mo
(+14%)
1
Referrals /mo

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