How Stale Is Your AI? Release age and training cutoff for 20 models
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.
How Stale Is Your AI? Release age and training cutoff for 20 models launched on September 16, 2026 with 82 votes, #382 of 8,094 launches that month and more than 95% of that year's launches.
In plain words
How Stale Is Your AI? tracks release dates and training cutoffs for 20 AI models across 8 labs, including GPT-6 Astra and Claude Fable 5.1. The site displays two live counters for each model: how long ago it was released and how old its training data is. It serves researchers and AI users who need to understand how current each model's knowledge actually is. Only 9 of the 20 models have publicly disclosed training cutoff dates.
written from the facts on this page · September 2026
From the sources
Two dates decide how current an AI model really is. The release date is when the lab shipped it. The training cutoff is when it stopped reading. This page holds both for 20 current models across 8 labs, and counts upward from each one live. 9 of 20 models have a cutoff their lab actually publishes. The live version of this page needs JavaScript for the counters. The dates themselves are below, and the same data is available as models.json . The training cutoff is the date a model stopped reading. Everything that happened after it is simply absent from what the model knows. A model can ship in September and still stop reading in April, which means it is five months behind on the day it…from stale.jock.pl
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