Breaking

Karpathy's LLM lectures spread as a free ~6-hour course

July 11, 2026 at 04:45 EDT

Education
Foundation Models
Open Source

A set of educational videos by Andrej Karpathy (OpenAI co-founder and former Tesla AI lead), compiled into a "free ~6-hour course," drew wide attention in July 2026 as a way to learn everything from how LLMs work to building ChatGPT from scratch.

July 2026 · A Free LLM Masterclass

Karpathy's ~6-Hour Course: Learn LLMs From First Principles

A compilation of Andrej Karpathy's high-quality videos, repackaged into a free three-part course — from how ChatGPT works to building GPT from scratch in code.

~6h

Total runtime, free on YouTube

Parts: deep dive · build from scratch · usage method

Cost — code implementations included

HOW THE ~6 HOURS BREAK DOWN

~3h 31m

Deep dive into LLMs like ChatGPT

~1h 56m

Building ChatGPT from scratch in code

Remainder

The Karpathy method for using LLMs

Column height proportional to segment length · each block ≈ 30 min

WHAT IT COVERS — END TO END

Tokenization Attention mechanism Pre-training Post-training RLHF Hallucinations Tool use Backprop → Transformer → GPT-2

Hands-on via GitHub repos like nanoGPT — followable across CPU/GPU or cloud setups such as Colab.

✓ WHY DEVELOPERS PRAISE IT

Ideal for first-principles understanding
More practical than paid bootcamps or lectures
Compared to a paid Stanford LLM course
Teaches architecture, not just prompting

! WHERE THE LIMITS ARE

Deep math can be tough for beginners
Training large models needs extra compute
Requires distributed-training knowledge
Latest 2026 models need further study

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