How stale is your AI? Data checked 2026-09-16. Two dates decide how current an AI model really is: the release date and the training cutoff. This page holds both for 20 current models across 8 labs, counting upward live. 10 of 20 models have a cutoff their lab actually publishes. The live version needs JavaScript for counters, but dates 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. Model Lab Released Training 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 Deep Mind 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 Open AI Jul 9, 2026 Feb 16, 2026 GPT-5.6 Luna Open AI Jul 9, 2026 Feb 16, 2026 Claude Opus 5 Anthropic Jul 24, 2026 May 2026 Qwen3.8-Max Alibaba Aug 3, 2026 Not established Muse Glimmer Meta Aug 10, 2026 Not established Grok 4.6 x AI Aug 12, 2026 Feb 1, 2026 Deep Seek V4-Pro Deep Seek 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 Deep Mind Sep 2, 2026 Not established Muse Spark 1.3 Meta Sep 2, 2026 Not established GPT-6 Astra Open AI Sep 3, 2026 Apr 30, 2026 Deep Seek V4.1-Flash Deep Seek Sep 10, 2026 Not established.

Common questions: What is an AI training cutoff? The date a model stopped reading. What is the difference between a release date and a training cutoff? Release date is when the lab shipped it; cutoff is when it stopped reading. Does browsing or web search fix a stale training cutoff? No. Which AI labs publish a training cutoff date? 5 of 8 labs: Anthropic, Google Deep Mind, Meta, Open AI and x AI. How do I ask a model for its own training cutoff? Ask directly. How old is GPT-6 Astra and its training data? Released Sep 3, 2026; cutoff Apr 30, 2026. Digital Thoughts /jock.pl / wiz.jock.pl