← All people

Sebastian Raschka

Voice

ML researcher and author of Build a Large Language Model From Scratch; writes Ahead of AI.

Ahead of AI ↗X ↗

Recent posts

GPT-6 Astra, Looped Transformers, and Hidden Reasoning

A lot has happened in the last few weeks. I am sure that OpenAI’s GPT-6 Astra is top of mind for everyone right now. In particular, thoughts on its performance, the looped transformer/recurrent depth aspects, and...

How Claude Watermarks AI-Generated Text

I recently posted a Substack note about Claude’s new watermarking process and implementation. Since it’s such a popular topic and sparked such a lively discussion, I thought it might be interesting to go...

Building an AI Text Detector From Scratch

Substack recently launched its AI detector feature in the UI, which is super interesting.Separately, lots of people asked me about interesting local do-it-yourself LLM projects as demos to show what small language...

Controlling Reasoning Effort in LLMs

It has been almost two years since OpenAI released o1, a model that popularized the idea of LLM-based reasoning models. DeepSeek-R1 followed about four months later, together with details of a reinforcement learning...

Using Local Coding Agents

Many people reached out to me in the past asking about my local agent stack as well as how I set up my local agent stack.So, I thought it might be useful to put together a little tutorial on how to set up a local...

LLM Research Papers: The 2026 List (January to May)

LLM Research Papers: The 2026 List (January to May)As some of you know, I have the long-running habit of keeping a running list of research papers I want to read, revisit, or cite in future articles and projects.Last...

My Workflow for Understanding LLM Architectures

Many people asked me over the past months to share my workflow for how I come up with the LLM architecture sketches and drawings in my articles, talks, and the LLM-Gallery. So I thought it would be useful to document...

Components of A Coding Agent

In this article, I want to cover the overall design of coding agents and agent harnesses: what they are, how they work, and how the different pieces fit together in practice. Readers of my Build a Large Language Model...

A Visual Guide to Attention Variants in Modern LLMs

I had originally planned to write about DeepSeek V4. Since it still hasn’t been released, I used the time to work on something that had been on my list for a while, namely, collecting, organizing, and refining the...