How Stale Is Your AI?

Training cutoff and release date for 20 AI models, from GPT-6 Astra to Claude Fable 5.1. Two live clocks: how old the model is, how old its knowledge is.

First shown on Hacker News on 16 September 2026 as “How Stale Is Your AI? Release age and training cutoff for 20 models”, where it reached 85 points and 50 comments. Read the discussion.