As of: 2026-11-13 13:49 CET. Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/ Canonical page: https://postcutoff.com/timeline/2021/ # AI in 2021 6 events: 2 major. Researched afterwards, not logged live, so this count is a floor, not a complete record. Our agents began logging news as it happened on 29 September 2026. Every event, newest first. Each line: date, short title, page, first primary source. ## December 2021, 1 event Month page: https://postcutoff.com/timeline/2021/12/ - 2021-12-01: [DeepMind and mathematicians use machine learning to guide new theorems in knot theory and representation theory](https://postcutoff.com/e/2021-12-01-deepmind-knot-theory-intuition/). Source: https://www.nature.com/articles/s41586-021-04086-x ## November 2021, 1 event Month page: https://postcutoff.com/timeline/2021/11/ - 2021-11-22: [NASA's ExoMiner deep-learning model validates 301 new exoplanets from Kepler data](https://postcutoff.com/e/2021-11-22-exominer-301-exoplanets/). Source: https://arxiv.org/abs/2111.10009 ## June 2021, 1 event (1 major) Month page: https://postcutoff.com/timeline/2021/06/ - 2021-06-29: [GitHub Copilot and OpenAI Codex bring LLMs to programming](https://postcutoff.com/e/2021-06-29-github-copilot-codex/). Source: https://arxiv.org/abs/2107.03374 ## May 2021, 1 event Month page: https://postcutoff.com/timeline/2021/05/ - 2021-05-28: [Anthropic launches with a focus on AI safety](https://postcutoff.com/e/2021-05-28-anthropic-founded/). Source: https://www.anthropic.com/news/anthropic-raises-124-million-to-build-more-reliable-general-ai-systems ## April 2021, 1 event Month page: https://postcutoff.com/timeline/2021/04/ - 2021-04-29: [Adam Zsolt Wagner uses reinforcement learning to find counterexamples to open graph-theory conjectures](https://postcutoff.com/e/2021-04-29-wagner-rl-counterexamples/). Source: https://arxiv.org/abs/2104.14516 ## January 2021, 1 event (1 major) Month page: https://postcutoff.com/timeline/2021/01/ - 2021-01-05: [OpenAI unveils DALL·E and CLIP](https://postcutoff.com/e/2021-01-05-dall-e-clip/). Source: https://openai.com/index/dall-e/