{
  "id": 4913879,
  "title": "Anthropic unveils Claude Fable 5.1, which is generally available, and Mythos 5.1, for trusted partners and with cybersecurity and life sciences safeguards (Anthropic)",
  "url": "https://urgent.news/2026/09/01/anthropic-unveils-claude-fable-5-1-which-is-generally-available-and",
  "topic": "ai",
  "section": "AI",
  "published": "2026-09-01T18:23:45.000Z",
  "source": {
    "name": "Techmeme",
    "slug": "techmeme",
    "url": "https://www.anthropic.com/claude-fable-and-mythos-5-1"
  },
  "original_language": "en",
  "account": "Anthropic has unveiled two new advanced AI models: Claude Fable 5.1 and Claude Mythos 5.1. While both models excel in coding and knowledge work, they differ in their research capabilities and the level of safeguards they offer. Claude Fable 5.1 is now generally available, while Claude Mythos 5.1 is restricted to specially selected partners due to its enhanced cybersecurity and life sciences safeguards. The price of Claude Fable 5.1 is estimated to be 25% lower than its predecessor for typical workloads, mainly due to reduced pricing on cache reads. The new Enterprise Frontier Safeguards (EFS) system ensures customer privacy by storing data in cloud infrastructure controlled entirely by the customer. With these improvements, Claude Fable 5.1 sets a new standard in coding, knowledge work, and long-running problem-solving tasks.",
  "summary": "We're introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world's most advanced models for coding and knowledge work …",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 8,
    "also_reported_by": [
      {
        "outlet": "Tom's Guide",
        "title": "Anthropic just made a staggering $35 billion bet on Claude — here's why it needs so much computing power",
        "url": "https://urgent.news/2026/09/01/anthropic-just-made-a-staggering-35-billion-bet-on-claude-heres-why",
        "published": "2026-09-01T13:16:44.000Z"
      },
      {
        "outlet": "9to5Mac",
        "title": "Anthropic upgrades Claude with new Fable 5.1 model, details here",
        "url": "https://urgent.news/2026/09/01/anthropic-upgrades-claude-with-new-fable-5-1-model-details-here",
        "published": "2026-09-01T18:10:16.000Z"
      },
      {
        "outlet": "VentureBeat",
        "title": "Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads",
        "url": "https://urgent.news/2026/09/01/anthropics-claude-fable-5-1-and-mythos-5-1-arrive-with-a-75-cost",
        "published": "2026-09-01T18:41:21.000Z"
      },
      {
        "outlet": "SiliconANGLE",
        "title": "Anthropic launches Claude Fable 5.1 after inking $35B cloud deal with Lambda",
        "url": "https://urgent.news/2026/09/01/anthropic-launches-claude-fable-5-1-after-inking-35b-cloud-deal-with",
        "published": "2026-09-01T20:50:53.000Z"
      },
      {
        "outlet": "Techmeme",
        "title": "Claude Fable 5.1 and Mythos 5.1 are Anthropic's first models to watermark text outputs; a detection API is available to eligible groups as required under EU law (Ben Patterson/PCWorld)",
        "url": "https://urgent.news/2026/09/01/claude-fable-5-1-and-mythos-5-1-are-anthropics-first-models-to",
        "published": "2026-09-01T20:55:02.000Z"
      },
      {
        "outlet": "Slashdot",
        "title": "Anthropic's Claude Fable 5.1 and Mythos 5.1 Arrive With a 75% Cost Reduction For Fable Cache Reads",
        "url": "https://urgent.news/2026/09/01/anthropics-claude-fable-5-1-and-mythos-5-1-arrive-with-a-75-cost-4942785",
        "published": "2026-09-01T21:00:00.000Z"
      },
      {
        "outlet": "The Verge",
        "title": "Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work",
        "url": "https://urgent.news/2026/09/01/anthropic-launches-claude-fable-5-1-and-says-its-up-to-45-percent",
        "published": "2026-09-01T22:01:36.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}