I've spent the better part of two weeks switching back and forth between Supermaven and Codeium as my daily inline completion engine, on an M2 MacBook Air running VS Code for TypeScript and a fair amount of Go. Both are in the small club of AI autocomplete tools that still offer a free tier worth actually using rather than a three-day trial dressed up as one. And both approach the same problem — ghost-text suggestions as you type — from noticeably different angles. This isn't a copilot-vs-the-world piece. It's narrower and, I think, more useful: if you specifically want fast, free, inline completion in 2026 and you're choosing between these two, which one should you install? The honest answer involves a plot twist, because one of these tools no longer has a fully independent future. I'll get to that. First, the thing you feel within ten minutes of using either: speed. Latency: the difference you actually feel Supermaven's entire pitch has always been latency, and it holds up.…