Show HN: How Stale Is Your AI? Release age and training cutoff for 20 models

A new data page tracks release dates and training cutoffs for 20 current AI models across 8 labs, finding that only 9 of the 20 models have a training cutoff their lab actually publishes. The page lists models including Meta's Llama 4 (released Apr 5, 2025, cutoff Aug 2024), Anthropic's Claude Opus 5 (released Jul 24, 2026, cutoff May 2026), and OpenAI's GPT-6 Astra (released Sep 3, 2026, cutoff Apr 30, 2026), with the gap between release and cutoff showing how far behind a model already was on launch day. Only 4 of the 8 labs — Anthropic, Google DeepMind, Meta and OpenAI — have a published cutoff for at least one model on the page, while Mistral AI, DeepSeek, Alibaba and xAI models are listed as 'Not established.'

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 https://stale.jock.pl/models.json . | Every model name links to the lab document the date came from. | | | | |---|---|---|---| | Model | Lab | Released | Training cutoff | |---|---|---|---| | Llama 4 https://huggingface.co/meta-llama/Llama-4-Maverick-17B-128E-Instruct | Meta | Apr 5, 2025 | Aug 2024 | | Claude Haiku 4.5 https://platform.claude.com/docs/en/docs/about-claude/models/overview | Anthropic | Oct 15, 2025 | Jul 2025 | | Mistral Large 3 https://docs.mistral.ai/resources/changelogs | Mistral AI | Dec 2, 2025 | Not established | | Gemini 3.1 Pro https://ai.google.dev/gemini-api/docs/changelog | Google DeepMind | Feb 19, 2026 | Jan 2025 | | Mistral Small 4 https://docs.mistral.ai/resources/changelogs | Mistral AI | Mar 16, 2026 | Not established | | Mistral Medium 3.5 https://docs.mistral.ai/resources/changelogs | Mistral AI | Apr 28, 2026 | Not established | | Claude Sonnet 5 https://www.anthropic.com/news/claude-sonnet-5 | Anthropic | Jun 30, 2026 | Jan 2026 | | GPT-5.6 Sol https://developers.openai.com/api/docs/models | OpenAI | Jul 9, 2026 | Feb 16, 2026 | | GPT-5.6 Luna https://developers.openai.com/api/docs/models | OpenAI | Jul 9, 2026 | Feb 16, 2026 | | Claude Opus 5 https://platform.claude.com/docs/en/models/opus-5/overview | Anthropic | Jul 24, 2026 | May 2026 | | DeepSeek V4-Flash https://api-docs.deepseek.com/updates/ | DeepSeek | Jul 31, 2026 | Not established | | Qwen3.8-Max https://www.alibabacloud.com/en/press-room/alibaba-unveils-qwen3-8-max | Alibaba | Aug 3, 2026 | Not established | | Muse Glimmer https://research.meta.ai/blog/introducing-muse-glimmer-open-agentic-model | Meta | Aug 10, 2026 | Not established | | Grok 4.6 https://docs.x.ai/developers/models/grok-4.6 | xAI | Aug 12, 2026 | Not established | | DeepSeek V4-Pro https://api-docs.deepseek.com/updates/ | DeepSeek | Aug 13, 2026 | Not established | | Qwen3.8-Flash https://help.aliyun.com/en/model-studio/newly-released-models | Alibaba | Aug 26, 2026 | Not established | | Claude Fable 5.1 https://platform.claude.com/docs/en/docs/about-claude/models/overview | Anthropic | Sep 1, 2026 | Jun 2026 | | Gemini 3.8 Flash https://ai.google.dev/gemini-api/docs/changelog | Google DeepMind | Sep 2, 2026 | Not established | | Muse Spark 1.3 https://research.meta.ai/blog/introducing-muse-spark-1-3 | Meta | Sep 2, 2026 | Not established | | GPT-6 Astra https://developers.openai.com/api/docs/models/gpt-6-astra | OpenAI | Sep 3, 2026 | Apr 30, 2026 | 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. 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. 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. 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. 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. 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.