Stuart Duff

Stuart Duff // HappIness Engineer

WooCommerce, WordPress, and everything in between.

I work at Automattic and spend my days helping people get the most out of WooCommerce and WordPress and writing code. This is where I share what I learn — tutorials, tips, plugins, and the occasional rant about customer service.

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  • Is Claude Fable 5 Worth Twice the Cost of Opus 4.8?

    Claude Fable 5 launched to the usual wave of social media hype. It is genuinely impressive on the right tasks. But Claude Fable 5 pricing is exactly double Opus 4.8, and for most of what teams are actually doing with AI day to day, that premium buys you nothing you would notice. Here is what…

  • How to Reduce Token Usage in Claude Code and Codex

    Claude Code and Codex CLI can get expensive fast, and the culprit is rarely the prompt you just typed. This post covers which tasks burn through tokens and the practical habits that bring costs down without slowing your workflow.

  • How I Use TDD With AI Coding Tools to Build WordPress and WooCommerce Plugins.

    I have been using PHPUnit for WordPress plugin testing for years. What changed when I started using AI tools was the order. Here is the TDD workflow I now use with Claude Code and Cursor.

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