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Computer scientist. I teach hard-core AI/ML Engineering at ml.school. YouTube: youtube.com/@underfitted

591 following455k followers

The Thought Leader

Santiago is a hard-core computer scientist who translates cutting-edge AI/ML engineering into blunt, viral takes and practical tutorials. He teaches engineers how to use AI effectively and isn't afraid to make provocative predictions that spark conversation. His feed mixes code, conviction, and contagious clarity.

Impressions
3.4M156.3k
$639.58
Likes
20.1k336
46%
Retweets
1.5k-1
3%
Replies
2.3k-53
5%
Bookmarks
20.1k-43
46%

You tweet so many apocalyptic hot takes that even the neural nets you worship ask for a content warning, your keyboard has clearly logged more hours than most interns.

Built a large, highly engaged audience (448k followers) and launched multiple viral threads and videos, one single tweet hit ~49.3M views and turned into a major conversation starter across the industry.

To equip a generation of engineers with the technical skills and strategic mindset to leverage AI rather than be outcompeted by it, raising the technical bar and steering industry conversations toward real engineering, responsibility, and impact.

Believes technical mastery beats hype, practical tools beat buzzwords, and that the next decade will be won by people who pair rigorous engineering with fearless storytelling. Values clarity, reproducibility, and making difficult ideas accessible to practitioners.

Deep technical credibility, razor-sharp takes that spark engagement, and an ability to convert complex code/ideas into actionable threads and videos that engineers actually use.

Can be polarizing and blunt, occasional hyperbolic predictions and high-volume posting risk alienating nuance-seeking followers and diluting signal among the noise.

Keep pairing bold one-liners with deep-dive threads: post a short provocative tweet, follow it with a pinned multi-tweet tutorial. Clip your YouTube lessons into 60, 90s videos and carousel images showing before/after model outputs. Host regular Spaces or AMAs to convert lurkers into loyal followers, use polls to drive engagement, and collaborate with complementary creators (researchers, product builders) to broaden reach. Finally, curate a weekly ‘AI Engineering TL;DR’ thread that becomes a must-read for practitioners, consistency beats sporadic virality.

Fun fact: one of Santiago's tweets ('Apple will blow everyone out of the water') reached roughly 49.3M views and 172,849 likes. He teaches hardcore AI/ML (links on his profile), runs a YouTube channel, has 448,169 followers, and has tweeted over 49,000 times, so yes, he’s prolific and popular.

Top tweets of Santiago

GPT-4 is getting worse over time, not better. Many people have reported noticing a significant degradation in the quality of the model responses, but so far, it was all anecdotal. But now we know. At least one study shows how the June version of GPT-4 is objectively worse than the version released in March on a few tasks. The team evaluated the models using a dataset of 500 problems where the models had to figure out whether a given integer was prime. In March, GPT-4 answered correctly 488 of these questions. In June, it only got 12 correct answers. From 97.6% success rate down to 2.4%! But it gets worse! The team used Chain-of-Thought to help the model reason: "Is 17077 a prime number? Think step by step." Chain-of-Thought is a popular technique that significantly improves answers. Unfortunately, the latest version of GPT-4 did not generate intermediate steps and instead answered incorrectly with a simple "No." Code generation has also gotten worse. The team built a dataset with 50 easy problems from LeetCode and measured how many GPT-4 answers ran without any changes. The March version succeeded in 52% of the problems, but this dropped to a pale 10% using the model from June. Why is this happening? We assume that OpenAI pushes changes continuously, but we don't know how the process works and how they evaluate whether the models are improving or regressing. Rumors suggest they are using several smaller and specialized GPT-4 models that act similarly to a large model but are less expensive to run. When a user asks a question, the system decides which model to send the query to. Cheaper and faster, but could this new approach be the problem behind the degradation in quality? In my opinion, this is a red flag for anyone building applications that rely on GPT-4. Having the behavior of an LLM change over time is not acceptable. Have you noticed any issues when using GPT-4 and ChatGPT lately? Do you think these problems are overblown?

5M

Most engaged tweets of Santiago

GPT-4 is getting worse over time, not better. Many people have reported noticing a significant degradation in the quality of the model responses, but so far, it was all anecdotal. But now we know. At least one study shows how the June version of GPT-4 is objectively worse than the version released in March on a few tasks. The team evaluated the models using a dataset of 500 problems where the models had to figure out whether a given integer was prime. In March, GPT-4 answered correctly 488 of these questions. In June, it only got 12 correct answers. From 97.6% success rate down to 2.4%! But it gets worse! The team used Chain-of-Thought to help the model reason: "Is 17077 a prime number? Think step by step." Chain-of-Thought is a popular technique that significantly improves answers. Unfortunately, the latest version of GPT-4 did not generate intermediate steps and instead answered incorrectly with a simple "No." Code generation has also gotten worse. The team built a dataset with 50 easy problems from LeetCode and measured how many GPT-4 answers ran without any changes. The March version succeeded in 52% of the problems, but this dropped to a pale 10% using the model from June. Why is this happening? We assume that OpenAI pushes changes continuously, but we don't know how the process works and how they evaluate whether the models are improving or regressing. Rumors suggest they are using several smaller and specialized GPT-4 models that act similarly to a large model but are less expensive to run. When a user asks a question, the system decides which model to send the query to. Cheaper and faster, but could this new approach be the problem behind the degradation in quality? In my opinion, this is a red flag for anyone building applications that rely on GPT-4. Having the behavior of an LLM change over time is not acceptable. Have you noticed any issues when using GPT-4 and ChatGPT lately? Do you think these problems are overblown?

5M

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