Juan Andrés Núñez.

Senior Frontend Engineer specializing in Agentic AI, professional educator and speaker. Where engineering meets humanism.

Juan Andrés Núñez
Focusing on
Building FrontendLeap: teaching how to build the professional Web with GenAI and learning science.
Claude Code

Claude Code: from zero to professional. Tips, tutorials and deep dive guides from an engineer who uses it 12 hours a day.

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#147

Sonnet 5, Opus 5 and Fable 5: which one I reach for, and what changing your mind costs

You have three frontier models in the picker and the official guidance tells you which is for what. What nobody mentions is the price of changing your mind mid-session, which is the decision you actually make several times a day.

#146

Dependent tasks in Claude Code: catch the flaw in your plan before it runs

Claude Code tasks can block each other. That turns the list into a graph, and a graph can be audited: it shows you how it understood the work before it writes a single line.

#145

Opus 5 in Claude Code: 8 tips from Anthropic on what to do differently

Anthropic published a model-specific prompting guide for Opus 5 on launch day, and almost nobody read it. Half of what it recommends is removing instructions from your CLAUDE.md, not adding them.

#144

Opus 5 in Claude Code: the model changed on its own, your settings didn't

Opus 5 landed today and on Max it's already your Default without you lifting a finger. But three things didn't move with it: your version, your alias, and the effort level you set weeks ago. Any one of them decides whether you're really running it.

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