Gemini 4 Carbon day-zero review: strong coder, weak judgment

BREAKING: @Google just dropped Gemini 4 Carbon. It’s a much better coder than Argon—but I’m probably keeping Argon for writing. We’ve been testing it at @every across coding, writing, design, and knowledge work. It can work for hours on an ambitious project, but it doesn’t always know when to stop. Here’s your day-zero vibe check: • Coding: On one run of our Senior Engineer benchmark, Carbon scored 44%, versus Argon’s 21%. A big improvement, though still middle of the pack. In a separate test, @hammer_mt gave it a backlog to work through. It identified 6 tasks as ready, then did 15—including work someone else was already doing. He stopped it after almost 4.5 hours. • Big builds: @RandyCounsman gave it 3D scans of our podcast studio and an equipment list. In one attempt, it built a browser-based model accurate enough to check whether new gear would fit without getting into the shot. He estimates Carbon also wrote about 95% of a big update to Everycut, our internal video editor. • Code quality: @kieranklaassen values its tests and documentation on large projects, including its record of approaches it considered and rejected. Fable remains his first choice, but Carbon has…