Rex McArthur

AI research @youdotcom Technical Advisor at @us_abstract formerly led AI @heyjasperai @Apple Maps, Lyft.

[Rex McArthur @drexmcarthur]

@lookyhere123 iPhone zoom doing some work. It’s about 4-5 miles away but I work in Santa Monica wand was just about two miles from it for most of the day.

[Rex McArthur @drexmcarthur]

Taken from my roof of the palisades fire. We’re safe but it’s a scary night. If anyone in LA needs a place to stay, let me know. We have a guest room in Marina Del Rey.

[Rex McArthur @drexmcarthur]

@jxnlco This is the way.

[Rex McArthur @drexmcarthur]

Up and to the right. Got lots in store for 2025. https://t.co/kEBaNLOSpe will gain some serious capabilities this year. 🫡

[Richard Socher @RichardSocher]

2024 was an incredible year for you .com. We grew revenue by 40x into the 8 digits. I want to thank our many large enterprise customers and pro subscribers.

There's a lot of hype in AI but ultimately knowledge workers and companies need accurate answers and reliable workflow automation with agents.

Several of our largest customers first had to fail with a Copilot or ChatGPT and then learned about our solution. They like our superior accuracy, not just of the answers but also the citations and search backend over massive, complex or fast-changing datasets.

The speed of change has been incredible so having quick access to all the best LLMs, all while being connected to the most accurate web search backend and your own company-internal data is incredibly powerful for our enterprise customers.

Our platform powers some of the largest companies in the world now. We provide over 20M answers on many days across our ydc product and APIs. It's exciting to see an extremely positive NDR in enterprise and our customers growing their usage.

The future of knowledge work is already here but not equally distributed. If you want to skip the hype and POCs and become more productive, we're here to help.

2025 will be incredible!

[Rex McArthur @drexmcarthur]

@PhilippeLaban @BMarcusMcCann @PranavVenkit @jasonwu0731 Great paper! Thanks for sharing. Excited to take a look and would fun to get a small “leaderboard” setup for when we make large updates to citation logic.

[Rex McArthur @drexmcarthur]

Sorry to interrupt your election doom scrolling but look who has the most accurate citations!

@youdotcom had made huge strides. Cool paper too.

https://t.co/LIVarboSc2

[Rex McArthur @drexmcarthur]

@pirroh @0xSigil Is there anything those of us less aware of these challenges can do to help? As an Eng leader, what can one do to help those experiencing these challenges stress less, struggle less?

[Rex McArthur @drexmcarthur]

@jasonfried Insane ROI on what is effectively one fewer FTE.

[Rex McArthur @drexmcarthur]

@HanchungLee https://t.co/tQG2e9Jr5l
https://t.co/kEBaNLPqeM does great

[Rex McArthur @drexmcarthur]

@JuliaANeagu @HamelHusain Metrics and measurement >> everything

[Rex McArthur @drexmcarthur]

@HamelHusain @JuliaANeagu is great! I didn’t realize you knew each other. Her work on evals is fantastic.

[Rex McArthur @drexmcarthur]

@jxnlco Blood memory

[Rex McArthur @drexmcarthur]

@andrew_n_carr Bar is low for v0. Use APIs. Save money improve quality second.

[Rex McArthur @drexmcarthur]

California usually has TONS of proposition ads, but I think I’ve missed all of them, but I’m very well informed on Nevada propositions.

[Rex McArthur @drexmcarthur]

YouTube TV for some reason thinks I live in Nevada. Having only lived in solid states (UT, CA) I am SHOCKED at the percentage ads that are political. I just got Trump, Harris, go vote, Trump, Harris.

[Rex McArthur @drexmcarthur]

@HanchungLee That’s the correct policy.

[Rex McArthur @drexmcarthur]

@NathanpmYoung I do this with cursor and some good pre prompting and markdown. Greatest markdown editor I’ve ever used.

[Rex McArthur @drexmcarthur]

@TheRideshareGuy I use and choose Waymo every single time. After tip it’s cheaper. I can plan ahead and wait an extra 10 mins, and in LA traffic, highways are rarely faster anyway. I mostly stick to the west side regardless. 100% Waymo user no matter the price

[Rex McArthur @drexmcarthur]

Do you think @EduardHabsburg is ever annoyed they took this from him? Does he have to pay admission to see the ol’ family cabin?

[Rex McArthur @drexmcarthur]

@burkov This is a pedantic gotcha question. Of course attention and measurement of output distributions is deterministic, but almost everyone uses them with some sort of stochastic sampler to look at sequential outputs.