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.

Helping companies and teams go AI First on the Claude platform.

Claude Code

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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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#208

Claude Code ultrathink: what it does now, and what it doesn't

Half the internet says it's dead, the other half thinks it maxes Claude out. I measured it across 45 runs: it's neither.

#207

Opus 5.5 vs Fable 5.1 vs Opus 5: the same tasks at a third of the cost

Anthropic promises Fable-level work for less than Opus 5. I put it to the test over 60 runs in Claude Code, Sonnet 5 included: nearly all of them pass (59 of 60), so the difference is in the bill and the clock.

#206

Opus 5.5 in Claude Code: Fable-level, faster, and cheaper than Opus 5

Opus 5.5 lands in Claude Code performing like Fable 5.1, generating over 30% faster than Opus 5 and costing 40% less. It's already your default model, but two details decide whether you're getting all of it.

#205

Claude Code plugin update: how to make your plugins update themselves

Your official plugins update themselves. Yours and third-party ones don't, and the update command reports you're current while serving a stale cache.

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