Three OpenAI safety researchers were fired after security officers
discovered Signal chats with disappearing messages turned on on
their


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TLDR 2026-10-23

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BIG TECH & STARTUPS

THE SIGNAL CHATS THAT COST OPENAI RESEARCHERS THEIR JOBS (13 MINUTE
READ) [8]

Three OpenAI safety researchers were fired after security officers
discovered Signal chats with disappearing messages turned on on their
personal devices. OpenAI claimed the researchers were fired for
violating clear policies for handling sensitive information and not
for raising safety concerns or speaking out. The researchers had spent
recent months at the company pushing for more industry collaboration
on safety. They claim their firings will serve as an excuse for OpenAI
to close a channel to independent third-party insight.

AMAZON'S NEW TABLET IS A CREDIBLE IPAD RIVAL FOR MUCH LESS MONEY (11
MINUTE READ) [9]

The Alexa Tablet lineup offers a more open approach to software than
Amazon's previous Fire brand that lets consumers use the devices like
any other Android tablet. Users can download apps from the Google Play
Store and access popular services like Gmail and YouTube. Amazon
previously restricted access to its own app marketplace. The 12-inch
Alexa Tablet Pro is well constructed and has a smooth 12-hertz
display, making it competitive with Apple's iPads.

¨

SCIENCE & FUTURISTIC TECHNOLOGY

SPACEX IN TALKS TO ACCESS 80,000 CELL SITES FOR NEW NETWORK (4 MINUTE
READ) [10]

SpaceX is in talks with Crown Castle Inc., one of the largest owners
of cellular towers in the US, as part of its plans to secure a minimum
of 80,000 cell sites across the country. Crown Castle is likely also
in talks with Amazon and other satellite-based telecom providers
regarding leasing deals. Elon Musk has openly discussed creating a
standalone wireless carrier from scratch. SpaceX recently acquired
low-band spectrum and has received approval to launch 15,000
satellites to provide mobile service directly to phones.

MODERNA AND MERCK SAY THEIR MRNA CANCER VACCINE CUT DEATH, RECURRENCE
BY 42% (3 MINUTE READ) [11]

Moderna and Merck's personalized mRNA vaccines against melanoma
demonstrate how mRNA technology has the potential to fundamentally
challenge how cancer is treated. The vaccine's success offers a new
paradigm for cancer therapies. The companies are already engaging with regulatory authorities to get the vaccine approved.

¨

PROGRAMMING, DESIGN & DATA SCIENCE

YOUR PROMPTS DESERVE MORE CONTEXT THAN YOU'LL EVER TYPE (SPONSOR)
[12]

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Flow [13] lets you say it instead: explain the bug and the edge cases
out loud, and it types clean, formatted text in any app. 4x faster
than typing, on Mac, Windows, iPhone and Android. Try Wispr Flow free
[14]

LLMS ARE MAKING FORMAL SOFTWARE VERIFICATION FEASIBLE AT A MUCH
LARGER SCALE (23 MINUTE READ) [15]

We need ways to prove that code is free from bugs. Formal software verification, which could provide this guarantee, has always required
years of expert effort, but LLMs can now produce formal proofs at
large scale. This enables new software development workflows that
include proven security guarantees. Formal verification will likely
become an essential part of secure software development as model
capabilities continue to improve.

ANTHROPIC BUILDS ITS OWN SOURCE CONTROL SYSTEM (15 MINUTE READ) [16]

Anthropic employs around 3,500 staff, but its coding output is closer
to that of a company with 35,000 to 70,000 staff. Big tech companies
like Google and Meta moved off Git a long time ago because it did not
scale for them. Both built their own custom solutions, just like
Anthropic did with Scion. This post provides some details about how
Anthropic's custom source control system works.

¨

MISCELLANEOUS

`IF ANYTHING HAPPENS TO THIS GUY ... EVERYONE IS SCREWED' (13
MINUTE READ) [17]

Ond¨ej Sur¨ is one of the volunteers who helps maintain and
automate patches for PHP. He alone is responsible for most of the
world's distribution of PHP. His work, along with just a handful of
others, has allowed countless websites and organizations to fix the
recently revealed PHP vulnerabilities quickly. He's become arguably
the unsung hero of the entire internet, despite the fact that the only compensation he receives for his work is from donations. This article
features an interview with Sur¨ where he discusses the unfolding AI-cybersecurity crisis, how the internet's infrastructure is
maintained by small crews of volunteers, and how it feels to save the
web.

AN ARTIST'S TAKE ON AI IN MATH (9 MINUTE READ) [18]

Mathematics seems to be a field where the outputs are celebrated less
as examples of subjective expression and more as advancements in
knowledge and understanding. A mathematician's work may be informed by
their experience, but that's not what gives their contributions value. Mathematical knowledge remains objectively true whether it is observed
by humans or sea sponges or computer programs.

¨

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pay attention. Learn more about sponsorship opportunities [19].

SOFTWARE IS SLOW BECAUSE OF BAD DESIGN, NOT SLOW LANGUAGES (7 MINUTE
READ) [20]

Most programs can't be meaningfully sped up by rewriting them in C or
Rust.

JPEG XL, WELCOME TO THE WEB! (5 MINUTE READ) [21]

JPEG XL is the end-game universal image format because it has
excellent compression efficiency, a universal feature set, wide color
depth, gamut, and native HDR, lossless JPEG transcoding, high-speed
parallel software encoding and decoding, and an open-source,
permissive license.

WARHOUND RAISES $200M TO ENGINEER WAR DOGS AND ARM THEM WITH ANDURIL
GEAR (4 MINUTE READ) [22]

The US has become increasingly reliant on foreign nations for dogs
that play an important role in the US military and law enforcement.

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SUPERVISORY ENGINEERING WORK (17 MINUTE READ) [25]

Supervisory engineering work is a different job from software
engineering and so requires a different system around it.

FINANCE IN THE INTELLIGENCE ERA (15 MINUTE READ) [26]

Finance companies in the AI era need to be built around continuous
decisions, portable assets, and delegated distribution.

I'M NOT DOING 996 (18 MINUTE READ) [27]

We are the ones who get to decide what to do with all of the
productivity that AI creates.

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[10] https://links.tldrnewsletter.com/zbZg0q
[11] https://arstechnica.com/health/2026/10/personalized-mrna-cancer-vaccine-cut-melanoma-death-recurrence-by-42/?utm_source=tldrnewsletter
[12] https://ref.wisprflow.ai/tldr-oct23-secondary-headline?sp=61g17KipIRmHpIGP3rWXyTxO
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[14] https://ref.wisprflow.ai/tldr-oct23-secondary-cta2?sp=61g17KipIRmHpIGP3rWXyTxO
[15] https://www.anthropic.com/research/formal-verification?utm_source=tldrnewsletter
[16] https://blog.pragmaticengineer.com/the-pulse-anthropic-builds-its-own-source-control-system/?utm_source=tldrnewsletter
[17] https://www.theatlantic.com/technology/2026/10/man-who-saved-internet-php-vulnerability/689123/?gift=iWa_iB9lkw4UuiWbIbrWGX0S2EScp28jU-louXZfg5I&utm_source=tldrnewsletter
[18] https://3blue1brown.substack.com/p/an-artists-take-on-ai-in-math?utm_source=tldrnewsletter
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[21] https://cgicoffee.com/blog/2026/10/jpeg-xl-welcome-to-the-web-chrome-firefox?utm_source=tldrnewsletter
[22] https://techcrunch.com/2026/10/22/ben-lamm-raises-200m-for-warhound-to-engineer-war-dogs-and-arm-them-with-anduril-gear/?utm_source=tldrnewsletter
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[25] https://annievella.com/posts/supervisory-engineering-work/?utm_source=tldrnewsletter
[26] https://www.fintechbrainfood.com/p/finance-in-the-intelligence-era?utm_source=tldrnewsletter
[27] https://www.elenaverna.com/p/im-not-doing-996?utm_source=tldrnewsletter [28] https://refer.tldr.tech/66662a80/
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