Cursor is the AI-native code editor and coding-agent product built by Anysphere. In this corpus it appears first as the vendor whose CEO ran GPT-5.2 Codex uninterrupted for a week to write a browser with a custom Rust rendering engine (three million lines in one week), far past the published five-hour autonomy horizon, and nine days later as the lab that found coding agents scale best when stratified into planners and workers.
Organization
Cursor
AI code editor and coding-agent vendor, built by Anysphere, whose CEO's week-long unattended GPT-5.2 Codex run first showed the corpus an autonomy horizon measured in weeks rather than hours.
Sources
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- Welcome to January 15, 2026 (theinnermostloop.substack.com)
Development timeline
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