Reletter

The Most Shared Links in Newsletters

Ranked by the number of distinct newsletters citing each link, measured across the 7m+ newsletters that Reletter tracks across Substack, Beehiiv, Kit, Ghost and LinkedIn. Every week around 350,000 fresh newsletter issues land in our index and these are the most shared links.
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September 12–18, 2026

This week newsletter writers shared Dario Amodei’s “We Must Pace the Frontier” more than anything else. They also linked to Anthropic’s September report on AI misuse and Jacob Coxon’s post saying he’d resigned because Anthropic and OpenAI weren’t acting responsibly. OpenAI’s post on the Navier–Stokes Millennium Prize Problem was widely cited too.

  1. 1
    We Must Pace the Frontier
    darioamodei.com·470 mentions
  2. 2
    Countering misuse of AI: September 2026
    anthropic.com·194 mentions
  3. 3
    Jacob Coxon on X: "I resigned from Anthropic today. I spent the last three years doing pretraining research at both OpenAI and Anthropic. Neither company is acting responsibly. They are racing straight to self-improving superintelligence and gambling with our lives. More thoughts below."
    x.com·130 mentions
  4. 4
    On the Navier–Stokes Millennium Prize Problem
    openai.com·113 mentions
  5. 5
    Brief independent investigation of agents’ behavior, reasoning and collaboration in the OpenAI / Hugging Face hacking incident
    metr.org·97 mentions
  6. 6
    The Hugging Face incident and the road ahead
    openai.com·87 mentions
  7. 7
    Evan Hubinger on X: "Jacob is correct here—we really do earnestly believe AI could kill all humans! I personally think it is >10% within the next decade. I believe Anthropic is trying its best, but we do not yet have a plan to solve alignment for superintelligence and are not clearly on track to…
    x.com·84 mentions
  8. 8
    An Alien Mind
    openai.com·75 mentions
  9. 9
    Donald Trump Jr.’s Wedding Bankrolled by Putin-Linked Russian Oligarch
    propublica.org·70 mentions
  10. 10
    Sam Altman on X: "I agree with Dario that we need to pace the frontier. This has been a primary topic of discussions we've had at OpenAI in recent weeks. Committing to having independent evaluators with employee-like access is a great idea, and we will do the same. We'll have more to share soon."
    x.com·65 mentions
  11. 11
    Introducing Muse: The World’s First Personal AI Agent Built for Everyone
    fb.com·61 mentions
  12. 12
    An alignment assessment of recent cybersecurity incidents
    anthropic.com·54 mentions
  13. 13
    Introducing ChatGPT Images 2.5
    openai.com·52 mentions
  14. 14
    Introducing the Agents API
    openai.com·51 mentions
  15. 15
    Scenarios for our Economic Future
    anthropic.com·47 mentions
  16. 16
    wsj.com/tech/ai/anthropic-researcher-quits-over-out-of-control-ai-fear…
    wsj.com·47 mentions
  17. 17
    Elon Musk on X: "Dario is right"
    x.com·45 mentions
  18. 18
    Declaration
    mathandai.org·39 mentions
  19. 19
    nytimes.com/2026/09/12/technology/anthropic-dario-amodei-ai-slowdown.h…
    nytimes.com·41 mentions
  20. 20
    Sanders, Casar to Introduce Legislation to Ban Artificial Superintelligence and Temporarily Pause Advanced AI Development
    senate.gov·37 mentions
  21. 21
    GPT-6 Astra: A new generation of intelligence
    openai.com·35 mentions
  22. 22
    cims.nyu.edu/~tristanb/statement.pdf
    nyu.edu·34 mentions
  23. 23
    Research acceleration: The view inside OpenAI
    openai.com·34 mentions
  24. 24
    bls.gov/news.release/cpi.nr0.htm
    bls.gov·32 mentions
  25. 25
    Investigating three incidents in our cybersecurity evaluations
    anthropic.com·32 mentions
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Past Weeks

September 12–18, 2026September 5–11, 2026Aug 31 – Sep 6, 2026August 24–30, 2026
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How is this list put together?

Every week Reletter extracts the outbound links from the newsletter issues published across 7m+ newsletters. Links are cleaned up so the same page only counts once (tracking parameters are stripped and redirects unwrapped), then ranked by how many distinct newsletters cited them.

Why rank by newsletters instead of total links?

Ranking by the number of distinct newsletters citing a link measures how widely it resonated across independent writers. A single newsletter repeating the same link many times cannot push it up the list.

What links are left out?

Links from a newsletter to its own site, sharing and subscribe buttons, images and other boilerplate are excluded. So are sponsor links that repeat across most issues of the same newsletter, since those are paid placements rather than citations.

When does it update?

A new list is published every Friday evening covering the week from Saturday to that Friday. Once published, each week is frozen and stays available on its own page.

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