Let’s build the GPT Tokenizer

Source

• Source kind: youtube-video
• URL: https://www.youtube.com/watch?v=zduSFxRajkE
• Discovery source: https://www.youtube.com/feeds/videos.xml?channel_id=UCXUPKJO5MZQN11PqgIvyuvQ
• License: YouTube-standard
• Distribution policy: public-metadata-summary-only
• Public mirror status: summary-only
• Content hash: 492a5433cf18777c799918d1a3cac4d8f63b640a6686d95a473dd0e36e877b20
• First seen: 2026-05-15
• Last changed: 2026-05-15

Classification

• Primary category: Talks, courses, and videos
• Corpus source note: 2026-05-15-karpathy-public-corpus
• Project taxonomy: karpathy-project-taxonomy
• Idea map: karpathy-idea-map
• Topic hub: karpathy-public-work

Summary

YouTube video from Karpathy’s public channel: Let’s build the GPT Tokenizer.

What This Teaches

• Use as a lecture-style source for Karpathy’s from-scratch explanations and AI system intuition.
• Pair with linked GitHub repos when a lecture has an accompanying codebase.

Why It Matters

These videos are among the clearest public sources for Karpathy’s pedagogy and implementation taste.

Public Handling Notes

• EXTRACTED: This page records public metadata and a source-grounded summary.
• INFERRED: Full local preservation, when available, is for private/local use unless a license or explicit source policy makes public redistribution safe.
• Do not treat this page as permission to republish unlicensed source text or code wholesale.