The world’s most popular programming language is losing market share to more specialized languages such as R and Perl, Tiobe says.

As AI tools such as Claude Code take off, most of the world’s software may end up being written by software. Hello, and welcome back to Fast Company’s Plugged In.

From fine-tuning open source models to building agentic frameworks on top of them, the open source world is ripe with projects that support AI development.

Explore a programming languages list with top coding languages explained, their uses, job prospects, and how to choose the right one for your projects in 2026.