GitHub Copilot

GitHub Copilot started in 2021 as autocomplete for code and has grown into a full assistant that lives inside editors, the command line and GitHub itself. It can write functions, explain unfamiliar code, and increasingly run longer jobs on its own across several files.

The interesting change is that Copilot is no longer tied to one model. Its picker holds models from OpenAI, Anthropic, Google and xAI side by side, and new ones often appear within days of launch. For developers that means switching costs almost nothing; for the labs it means every release is judged against the alternatives sitting one click away.