Pelayo Arbués
@pelayoarbues.com
Head of Data Science at idealista.com | Film photographer | Ph.D. in Economics | Sharing my digital garden at pelayoarbues.com | Working full remote from the North of Spain
Pinned
Pelayo Arbués
@pelayoarbues.com
· Nov 13
Wow! 2000 followers! Let me reintroduce myself: I’m Head of Data Science at idealista.com, Southern Europe’s leading real estate portal. I earned a Ph.D. and spent 7 years in academia researching transport and spatial econometrics. I’m into AI, management, and film photography.👇👇👇
Reposted by Pelayo Arbués
Once again I really, really needed this for a better Friday!
It is more relevant and hilarious every time I visit.
alignmentalignment.ai
It is more relevant and hilarious every time I visit.
alignmentalignment.ai
Center for the Alignment of AI Alignment Centers
We align the aligners
alignmentalignment.ai
October 24, 2025 at 8:52 PM
Once again I really, really needed this for a better Friday!
It is more relevant and hilarious every time I visit.
alignmentalignment.ai
It is more relevant and hilarious every time I visit.
alignmentalignment.ai
Just finished reading 3 Millones de Viviendas by @jorgegalindo.bsky.social. One of the sharpest takes on Spain’s housing crisis I’ve seen. Data, history, and a tough question: what kind of country do we want to build? www.pelayoarbues.com/notes/Tres-M... #realestate
October 8, 2025 at 6:54 PM
Just finished reading 3 Millones de Viviendas by @jorgegalindo.bsky.social. One of the sharpest takes on Spain’s housing crisis I’ve seen. Data, history, and a tough question: what kind of country do we want to build? www.pelayoarbues.com/notes/Tres-M... #realestate
Reposted by Pelayo Arbués
I'm ready to accept a definition of "agent" that I think is widely-enough agreed upon to be useful, at least in the AI engineering space:
An LLM agent runs tools in a loop to achieve a goal
(I've been dismissing the term as hopelessly ambiguous for years) simonwillison.net/2025/Sep/18/...
An LLM agent runs tools in a loop to achieve a goal
(I've been dismissing the term as hopelessly ambiguous for years) simonwillison.net/2025/Sep/18/...
I think “agent” may finally have a widely enough agreed upon definition to be useful jargon now
I’ve noticed something interesting over the past few weeks: I’ve started using the term “agent” in conversations where I don’t feel the need to then define it, roll my eyes …
simonwillison.net
September 18, 2025 at 7:15 PM
I'm ready to accept a definition of "agent" that I think is widely-enough agreed upon to be useful, at least in the AI engineering space:
An LLM agent runs tools in a loop to achieve a goal
(I've been dismissing the term as hopelessly ambiguous for years) simonwillison.net/2025/Sep/18/...
An LLM agent runs tools in a loop to achieve a goal
(I've been dismissing the term as hopelessly ambiguous for years) simonwillison.net/2025/Sep/18/...
Context engineering is the new AI buzzword. And here we go again: www.pelayoarbues.com/notes/Contex...
September 23, 2025 at 8:41 AM
Context engineering is the new AI buzzword. And here we go again: www.pelayoarbues.com/notes/Contex...
Reposted by Pelayo Arbués
The data industry promotes builders.
Not leaders.
You nailed pipelines.
So they gave you politics.
Now you're managing people, budgets, and roadmaps.
With zero training.
You’re not unqualified.
You’re just undertrained.
Not leaders.
You nailed pipelines.
So they gave you politics.
Now you're managing people, budgets, and roadmaps.
With zero training.
You’re not unqualified.
You’re just undertrained.
July 24, 2025 at 12:02 PM
The data industry promotes builders.
Not leaders.
You nailed pipelines.
So they gave you politics.
Now you're managing people, budgets, and roadmaps.
With zero training.
You’re not unqualified.
You’re just undertrained.
Not leaders.
You nailed pipelines.
So they gave you politics.
Now you're managing people, budgets, and roadmaps.
With zero training.
You’re not unqualified.
You’re just undertrained.
Reposted by Pelayo Arbués
If you load this page it contacts 82 IP addresses executing 256 separate HTTP transactions to download 18MB of data writing 64 cookies to your device to tell you “no”
May 24, 2025 at 10:37 AM
If you load this page it contacts 82 IP addresses executing 256 separate HTTP transactions to download 18MB of data writing 64 cookies to your device to tell you “no”
Reposted by Pelayo Arbués
OpenAI announced Codex (openai.com/index/introd...) on May 16, 2025 for their $200/month Pro users, and Google announced a competing tool called Jules (jules.google) on May 20, 2025 making it available for FREE.
There’s no moat in AI—how can a moat disappear in less than a week?
There’s no moat in AI—how can a moat disappear in less than a week?
Jules - An Asynchronous Coding Agent
Jules is an asynchronous agent that gets out of your way. It lets you focus on the coding you want to do, meawnwhile picking up all the other random tasks that you rather not do.
jules.google
May 21, 2025 at 4:44 AM
OpenAI announced Codex (openai.com/index/introd...) on May 16, 2025 for their $200/month Pro users, and Google announced a competing tool called Jules (jules.google) on May 20, 2025 making it available for FREE.
There’s no moat in AI—how can a moat disappear in less than a week?
There’s no moat in AI—how can a moat disappear in less than a week?
Reposted by Pelayo Arbués
Veo 3: "a big broadway musical about garlic bread, with elaborate costumes and a sondheim-like vibe"
May 21, 2025 at 5:46 AM
Veo 3: "a big broadway musical about garlic bread, with elaborate costumes and a sondheim-like vibe"
Reposted by Pelayo Arbués
Every AI coding tools company doing demos with React + Typescript (and maybe React Native.)
Microsoft meanwhile showing off Java and .NET case studies.
This doesn’t look like an accident - but a very deliberate strategy.
It’s easier to win when you are on a ground with fewer competitors…
Microsoft meanwhile showing off Java and .NET case studies.
This doesn’t look like an accident - but a very deliberate strategy.
It’s easier to win when you are on a ground with fewer competitors…
May 20, 2025 at 4:21 PM
Every AI coding tools company doing demos with React + Typescript (and maybe React Native.)
Microsoft meanwhile showing off Java and .NET case studies.
This doesn’t look like an accident - but a very deliberate strategy.
It’s easier to win when you are on a ground with fewer competitors…
Microsoft meanwhile showing off Java and .NET case studies.
This doesn’t look like an accident - but a very deliberate strategy.
It’s easier to win when you are on a ground with fewer competitors…
Reposted by Pelayo Arbués
VEO 3
Prompt: Generate a TV news anchor with a British accent, the anchor says "in shocking news, Jake Kaye Rowe ling's yacht sank with her on board after being attacked by orcas off the coast of turkey" include the announcement in the dialogue.
This took one prompt and 2 minutes to generate.
Prompt: Generate a TV news anchor with a British accent, the anchor says "in shocking news, Jake Kaye Rowe ling's yacht sank with her on board after being attacked by orcas off the coast of turkey" include the announcement in the dialogue.
This took one prompt and 2 minutes to generate.
May 21, 2025 at 2:26 AM
VEO 3
Prompt: Generate a TV news anchor with a British accent, the anchor says "in shocking news, Jake Kaye Rowe ling's yacht sank with her on board after being attacked by orcas off the coast of turkey" include the announcement in the dialogue.
This took one prompt and 2 minutes to generate.
Prompt: Generate a TV news anchor with a British accent, the anchor says "in shocking news, Jake Kaye Rowe ling's yacht sank with her on board after being attacked by orcas off the coast of turkey" include the announcement in the dialogue.
This took one prompt and 2 minutes to generate.
500 days reviewing highlights on @readwise.bsky.social!!!
May 20, 2025 at 8:18 PM
500 days reviewing highlights on @readwise.bsky.social!!!
I just shared a learning path guide for software developers looking to infuse AI into their products, tailored specifically to your needs, interests, and how deep you'd like to dive.
www.pelayoarbues.com/notes/AI-Lea...
www.pelayoarbues.com/notes/AI-Lea...
May 20, 2025 at 7:49 PM
I just shared a learning path guide for software developers looking to infuse AI into their products, tailored specifically to your needs, interests, and how deep you'd like to dive.
www.pelayoarbues.com/notes/AI-Lea...
www.pelayoarbues.com/notes/AI-Lea...
Reposted by Pelayo Arbués
When people are pressured to meet a target value there are three ways they can proceed:
1) They can work to improve the system
2) They can distort the system
3) Or they can distort the data
— Donald Wheeler
commoncog.com/goodharts-la...
1) They can work to improve the system
2) They can distort the system
3) Or they can distort the data
— Donald Wheeler
commoncog.com/goodharts-la...
Goodhart's Law Isn't as Useful as You Might Think
Goodhart's Law is useless. It tells you about a phenomenon, but it doesn't tell you how to solve it. We look at how organisations actually prevent Goodhart's Law, and illustrate this with Amazon's Wee...
commoncog.com
May 14, 2025 at 6:15 PM
When people are pressured to meet a target value there are three ways they can proceed:
1) They can work to improve the system
2) They can distort the system
3) Or they can distort the data
— Donald Wheeler
commoncog.com/goodharts-la...
1) They can work to improve the system
2) They can distort the system
3) Or they can distort the data
— Donald Wheeler
commoncog.com/goodharts-la...
Reposted by Pelayo Arbués
I don't know why people think picking a model on ChatGPT is so complicated.
May 14, 2025 at 1:36 AM
I don't know why people think picking a model on ChatGPT is so complicated.
Reposted by Pelayo Arbués
SmolVLM real-time camera is a framework for running computer vision models locally on M3 MacBooks. It combines HTML webcam access with llama.cpp's inference process to enable real-time image capture, understanding, and captioning.
www.threads.com/@luokai/post...
www.threads.com/@luokai/post...
luokai (@luokai) on Threads
SmolVLM real-time camera is a framework for running computer vision models locally on M3 MacBooks. It combines HTML webcam access with llama.cpp's inference process to enable real-time image capture, ...
www.threads.com
May 13, 2025 at 3:10 PM
SmolVLM real-time camera is a framework for running computer vision models locally on M3 MacBooks. It combines HTML webcam access with llama.cpp's inference process to enable real-time image capture, understanding, and captioning.
www.threads.com/@luokai/post...
www.threads.com/@luokai/post...
Reposted by Pelayo Arbués
It is a little weird to me countries aren’t more aggressively, formally trying to take advantage of the U.S. science brain drain. Once in a lifetime opportunity to buy low on Non-Dumbass Americans with PhDs who just wanna look into microscopes and quietly cure ass cancer as our country eats shit.
May 4, 2025 at 8:54 PM
It is a little weird to me countries aren’t more aggressively, formally trying to take advantage of the U.S. science brain drain. Once in a lifetime opportunity to buy low on Non-Dumbass Americans with PhDs who just wanna look into microscopes and quietly cure ass cancer as our country eats shit.
Reposted by Pelayo Arbués
Nuevo post. Área de aplicación. Cosas curiosas que he leído este finde y que me parecen interesantes. Reproduzco parte de un post de Jakub Nowosad
muestrear-no-es-pecado.es/2025/05/aoa
muestrear-no-es-pecado.es/2025/05/aoa
Área de Aplicación – Muestrear no es pecado
On this page
muestrear-no-es-pecado.es
May 4, 2025 at 10:10 AM
Nuevo post. Área de aplicación. Cosas curiosas que he leído este finde y que me parecen interesantes. Reproduzco parte de un post de Jakub Nowosad
muestrear-no-es-pecado.es/2025/05/aoa
muestrear-no-es-pecado.es/2025/05/aoa
Just finished 'Power and Prediction'. Loved the economic take: AI dramatically reduces prediction costs but leaves human judgment scarce. Also, great analogy with electricity, real AI impact requires systemic change www.pelayoarbues.com/notes/Power-...
Power and Prediction
I have recently finished reading Power and Prediction.
www.pelayoarbues.com
April 30, 2025 at 10:11 PM
Just finished 'Power and Prediction'. Loved the economic take: AI dramatically reduces prediction costs but leaves human judgment scarce. Also, great analogy with electricity, real AI impact requires systemic change www.pelayoarbues.com/notes/Power-...
Reposted by Pelayo Arbués
Spain's power is slowly coming back, but situation still far from normal. Out of the 33 GW scheduled for this evening peak, only 18 GW is available. Nuclear and coal-fired power plants still offline.
April 28, 2025 at 7:24 PM
Spain's power is slowly coming back, but situation still far from normal. Out of the 33 GW scheduled for this evening peak, only 18 GW is available. Nuclear and coal-fired power plants still offline.
When we don’t know someone well, we tend to project intentions onto them, casting them as a character in a play they themselves are unaware exists.
April 12, 2025 at 7:17 PM
When we don’t know someone well, we tend to project intentions onto them, casting them as a character in a play they themselves are unaware exists.
Why software engineers should learn a bit of data science www.pelayoarbues.com/notes/Why-So... #databs
April 1, 2025 at 7:52 PM
Why software engineers should learn a bit of data science www.pelayoarbues.com/notes/Why-So... #databs
In simple terms, the purpose of data is to give you a causal model of your business in your head. If reality changes, the figures in your business should show it. At which point you get to update your knowledge.
April 1, 2025 at 7:46 PM
In simple terms, the purpose of data is to give you a causal model of your business in your head. If reality changes, the figures in your business should show it. At which point you get to update your knowledge.
Coaching is no longer a specialty; you cannot be a good manager without being a good coach. The path to success in a fast- moving, highly competitive, technology- driven business world is to form high- performing teams and give them the resources and freedom to do great things.
March 25, 2025 at 9:01 PM
Coaching is no longer a specialty; you cannot be a good manager without being a good coach. The path to success in a fast- moving, highly competitive, technology- driven business world is to form high- performing teams and give them the resources and freedom to do great things.
When leaders take steps to protect their own interests, particularly when those steps are taken at the expense of others, they send a message to everyone else that it is okay to do the same.
March 24, 2025 at 8:14 PM
When leaders take steps to protect their own interests, particularly when those steps are taken at the expense of others, they send a message to everyone else that it is okay to do the same.
To maintain the core of your product there are usually one or two things that have to stay still while everything else spins and changes around them. And that’s a useful constraint. You need some constraints to force you to dig deep and get creative.
March 17, 2025 at 8:13 PM
To maintain the core of your product there are usually one or two things that have to stay still while everything else spins and changes around them. And that’s a useful constraint. You need some constraints to force you to dig deep and get creative.