{
  "name": "How Stale Is Your AI?",
  "description": "Release date and published training cutoff for every current frontier and fast AI model, checked by hand against each lab's own documentation.",
  "source": "https://stale.jock.pl/",
  "checked": "2026-09-10",
  "license": "CC BY 4.0, credit https://stale.jock.pl",
  "count": 20,
  "fields": {
    "vendor": "Lab that ships the model.",
    "model": "Model name as the lab writes it.",
    "released": "ISO date the model became publicly available.",
    "cutoff": "ISO date or year-month the training data stops, null when the checked vendor sources do not establish one.",
    "tier": "Flagship, Fast, Reasoning or Open, as positioned by the lab.",
    "source": "The document the two dates were read from."
  },
  "models": [
    {
      "vendor": "Meta",
      "model": "Llama 4",
      "released": "2025-04-05",
      "cutoff": "2024-08",
      "tier": "Open",
      "source": "https://huggingface.co/meta-llama/Llama-4-Maverick-17B-128E-Instruct"
    },
    {
      "vendor": "Anthropic",
      "model": "Claude Haiku 4.5",
      "released": "2025-10-15",
      "cutoff": "2025-07",
      "tier": "Speed",
      "source": "https://platform.claude.com/docs/en/docs/about-claude/models/overview"
    },
    {
      "vendor": "Mistral AI",
      "model": "Mistral Large 3",
      "released": "2025-12-02",
      "cutoff": null,
      "tier": "Flagship",
      "source": "https://docs.mistral.ai/resources/changelogs"
    },
    {
      "vendor": "Google DeepMind",
      "model": "Gemini 3.1 Pro",
      "released": "2026-02-19",
      "cutoff": "2025-01",
      "tier": "Flagship",
      "source": "https://ai.google.dev/gemini-api/docs/changelog"
    },
    {
      "vendor": "Mistral AI",
      "model": "Mistral Small 4",
      "released": "2026-03-16",
      "cutoff": null,
      "tier": "Speed",
      "source": "https://docs.mistral.ai/resources/changelogs"
    },
    {
      "vendor": "Mistral AI",
      "model": "Mistral Medium 3.5",
      "released": "2026-04-28",
      "cutoff": null,
      "tier": "Mid",
      "source": "https://docs.mistral.ai/resources/changelogs"
    },
    {
      "vendor": "Anthropic",
      "model": "Claude Sonnet 5",
      "released": "2026-06-30",
      "cutoff": "2026-01",
      "tier": "Mid",
      "source": "https://www.anthropic.com/news/claude-sonnet-5"
    },
    {
      "vendor": "OpenAI",
      "model": "GPT-5.6 Sol",
      "released": "2026-07-09",
      "cutoff": "2026-02-16",
      "tier": "Mid",
      "source": "https://developers.openai.com/api/docs/models"
    },
    {
      "vendor": "OpenAI",
      "model": "GPT-5.6 Luna",
      "released": "2026-07-09",
      "cutoff": "2026-02-16",
      "tier": "Speed",
      "source": "https://developers.openai.com/api/docs/models"
    },
    {
      "vendor": "Anthropic",
      "model": "Claude Opus 5",
      "released": "2026-07-24",
      "cutoff": "2026-05",
      "tier": "Mid",
      "source": "https://platform.claude.com/docs/en/models/opus-5/overview"
    },
    {
      "vendor": "DeepSeek",
      "model": "DeepSeek V4-Flash",
      "released": "2026-07-31",
      "cutoff": null,
      "tier": "Speed",
      "source": "https://api-docs.deepseek.com/updates/"
    },
    {
      "vendor": "Alibaba",
      "model": "Qwen3.8-Max",
      "released": "2026-08-03",
      "cutoff": null,
      "tier": "Flagship",
      "source": "https://www.alibabacloud.com/en/press-room/alibaba-unveils-qwen3-8-max"
    },
    {
      "vendor": "Meta",
      "model": "Muse Glimmer",
      "released": "2026-08-10",
      "cutoff": null,
      "tier": "Open",
      "source": "https://research.meta.ai/blog/introducing-muse-glimmer-open-agentic-model"
    },
    {
      "vendor": "xAI",
      "model": "Grok 4.6",
      "released": "2026-08-12",
      "cutoff": null,
      "tier": "Flagship",
      "source": "https://docs.x.ai/developers/models/grok-4.6"
    },
    {
      "vendor": "DeepSeek",
      "model": "DeepSeek V4-Pro",
      "released": "2026-08-13",
      "cutoff": null,
      "tier": "Flagship",
      "source": "https://api-docs.deepseek.com/updates/"
    },
    {
      "vendor": "Alibaba",
      "model": "Qwen3.8-Flash",
      "released": "2026-08-26",
      "cutoff": null,
      "tier": "Open",
      "source": "https://help.aliyun.com/en/model-studio/newly-released-models"
    },
    {
      "vendor": "Anthropic",
      "model": "Claude Fable 5.1",
      "released": "2026-09-01",
      "cutoff": "2026-06",
      "tier": "Flagship",
      "source": "https://platform.claude.com/docs/en/docs/about-claude/models/overview"
    },
    {
      "vendor": "Google DeepMind",
      "model": "Gemini 3.8 Flash",
      "released": "2026-09-02",
      "cutoff": null,
      "tier": "Speed",
      "source": "https://ai.google.dev/gemini-api/docs/changelog"
    },
    {
      "vendor": "Meta",
      "model": "Muse Spark 1.3",
      "released": "2026-09-02",
      "cutoff": null,
      "tier": "Flagship",
      "source": "https://research.meta.ai/blog/introducing-muse-spark-1-3"
    },
    {
      "vendor": "OpenAI",
      "model": "GPT-6 Astra",
      "released": "2026-09-03",
      "cutoff": "2026-04-30",
      "tier": "Flagship",
      "source": "https://developers.openai.com/api/docs/models/gpt-6-astra"
    }
  ]
}