How Stale Is Your AI?

How stale is your AI? Data checked 2026-09-10 How stale is your AI? Release age and training cutoff for 20 models 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 shelf: release date and training cutoff, stalest first Every model name links to the lab document the date came from. ModelLabReleasedTraining cutoff Llama 4 Meta Apr 5, 2025 Aug 2024 Claude Haiku 4.5 Anthropic Oct 15, 2025 Jul 2025 Mistral Large 3 Mistral AI Dec 2, 2025 Not established Gemini 3.1 Pro Google DeepMind Feb 19, 2026 Jan 2025 Mistral Small 4 Mistral AI Mar 16, 2026 Not established Mistral Medium 3.5 Mistral AI Apr 28, 2026 Not established Claude Sonnet 5 Anthropic Jun 30, 2026 Jan 2026 GPT-5.6 Sol OpenAI Jul 9, 2026 Feb 16, 2026 GPT-5.6 Luna OpenAI Jul 9, 2026 Feb 16, 2026 Claude Opus 5 Anthropic Jul 24, 2026 May 2026 DeepSeek V4-Flash DeepSeek Jul 31, 2026 Not established Qwen3.8-Max Alibaba Aug 3, 2026 Not established Muse Glimmer Meta Aug 10, 2026 Not established Grok 4.6 xAI Aug 12, 2026 Not established DeepSeek V4-Pro DeepSeek Aug 13, 2026 Not established Qwen3.8-Flash Alibaba Aug 26, 2026 Not established Claude Fable 5.1 Anthropic Sep 1, 2026 Jun 2026 Gemini 3.8 Flash Google DeepMind Sep 2, 2026 Not established Muse Spark 1.3 Meta Sep 2, 2026 Not established GPT-6 Astra OpenAI Sep 3, 2026 Apr 30, 2026 Common questions about training cutoffs What is an AI training cutoff? 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 launches. What is the difference between a release date and a training cutoff? The release date is when the lab put the model in front of you, and it is what the headlines report. The training cutoff is when the model stopped reading. The gap between the two is how far behind the model already was on launch day, before a single user typed anything into it. Does browsing or web search fix a stale training cutoff? No. When a model searches the web for you it is not learning anything. It reads a few pages, uses them in that one answer, and forgets. Open a new chat and it is April again. Search tools paper over the gap. They never close it. Which AI labs publish a training cutoff date? 4 of 8 labs have a published cutoff for at least one model on this page: Anthropic, Google DeepMind, Meta and OpenAI. 9 of 20 current models carry a published cutoff. A blank means the checked vendor sources did not establish a cutoff for that model; it is not proof that the lab has never published one. How do I ask a model for its own training cutoff? Ask it directly: "what is your training cutoff date?" A well behaved model answers, or says it is not sure. One that invents a confident date has just told you something useful about itself. Check the answer against this page before you trust it, because a model is a poor source on models. How old is GPT-6 Astra and its training data? GPT-6 Astra was released on Sep 3, 2026 and its training data stops at Apr 30, 2026. Both counters on this page tick upward from those dates, so the numbers stay correct without anyone editing them. Digital Thoughts / jock.pl / wiz.jock.pl