It's the OG (original game-changer) of AI editors, and its O1 integration paired with its usage-based pricing options remains unrivaled. It helped me speed up development by automating code changes—moving from manual copy-pasting to seamless updates—and boosted my productivity by at least 3x.
The Sonnet 3.5 helped with creating the first prototypes (in three separate programming languages: Python, JS, and Swift in 2 hours, and everything started from there.
It’s astonishingly context-aware (e.g.: knows which line and file the cursor is on, what changes happened so far, even deleted lines etc), with a standout revert UX and the best agent mode in the game—it was the first to market with a unified agent and chat experience. I rarely have to manually click 'Apply' after using its agent. It wrote 95% of the code for this project.