Andrej Karpathy. Karpathy spends explicit chapters on "Be aware of the model you're using, pricing tiers" and "Thinking models and when to use them," then keeps switching between ChatGPT, Claude, Gemini, Grok, and Perplexity throughout the rest of the walkthrough. It is the closest thing to watching the article's cheat sheet applied live by someone with strong opinions about when each tier earns its keep.
The model-picker habits are valuable; exact model names, prices, context limits and rankings are not stable. Re-run the comparison on your own tasks before standardizing a team recommendation.
Learn to route work across fast, cheap, deep-reasoning and source-grounded tools instead of using one model for everything.
Comfort using at least one mainstream chatbot and comparing outputs on the same task.
Continue through the same learning path with the next curated companion videos.