{
  "id": 874039,
  "title": "China's Z.ai says new model nears Anthropic's Mythos 5 in cyber-defence tests",
  "url": "https://urgent.news/2026/08/14/chinas-z-ai-says-new-model-nears-anthropics-mythos-5-in-cyber-defence-874039",
  "topic": "ai",
  "section": "AI",
  "published": "2026-08-14T12:55:42.000Z",
  "source": {
    "name": "Economic Times Tech",
    "slug": "economic-times-tech",
    "url": "https://economictimes.indiatimes.com/tech/artificial-intelligence/chinas-z-ai-says-new-model-nears-anthropics-mythos-5-in-cyber-defence-tests/articleshow/133242158.cms"
  },
  "original_language": "en",
  "account": "Chinese AI startup Z.ai announced on Friday that its open-source GLM-5.3 model was nearing Anthropic's restricted Mythos 5 in cybersecurity tests. The GLM-5.3 model scored 84.5% on CyberGym, a test measuring a model's ability to review code, identify security flaws, and confirm their authenticity. This was slightly higher than Mythos 5's 83.8% score. However, GLM-5.3 lagged behind Mythos 5 in converting discovered flaws into working attacks, with a 54.4% score compared to Mythos 5's 78.0% on the ExploitBench test. In a timed test, GLM-5.3 completed 105 attack-development tasks in two hours and 130 in six hours, while Mythos 5 completed 181 and 247 tasks, respectively. Anthropic has limited access to its Mythos model to vetted organizations due to concerns about potential misuse. Z.ai plans to release GLM-5.3 publicly in two weeks after completing security assessments and enhancing its safeguards, with sensitive cybersecurity functions available only to verified users through a trusted access program. This move reflects China's growing sophistication in open-weight risk management practices, according to AI governance researcher Gabriel Wagner.",
  "summary": "Anthropic has made Mythos, a version of its Claude Fable 5 model with cybersecurity safeguards removed, available only to vetted organisations. Such controls reflect concern that AI systems capable of finding and exploiting software flaws can assist defenders but may also lower barriers for attackers.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 6,
    "also_reported_by": [
      {
        "outlet": "Channel News Asia",
        "title": "China's Z.ai says new model nears Anthropic's Mythos 5 in cyber-defence tests",
        "url": "https://urgent.news/2026/08/14/chinas-z-ai-says-new-model-nears-anthropics-mythos-5-in-cyber-defence",
        "published": "2026-08-14T10:45:00.000Z"
      },
      {
        "outlet": "9to5Mac",
        "title": "Apple’s China AI strategy now includes training its own custom model, per report",
        "url": "https://urgent.news/2026/08/14/apples-china-ai-strategy-now-includes-training-its-own-custom-model",
        "published": "2026-08-14T14:11:02.000Z"
      },
      {
        "outlet": "Techmeme",
        "title": "Risk report: Anthropic raises misalignment risk estimate from very low to low and says it doesn't plan to release a stronger internal model called \"Model 2\" (Madison Mills/Axios)",
        "url": "https://urgent.news/2026/08/14/risk-report-anthropic-raises-misalignment-risk-estimate-from-very-low",
        "published": "2026-08-14T19:45:01.000Z"
      },
      {
        "outlet": "Nikkei Asia",
        "title": "China's Z.ai launches model it says rivals Anthropic's Mythos",
        "url": "https://urgent.news/2026/08/14/chinas-z-ai-launches-model-it-says-rivals-anthropics-mythos",
        "published": "2026-08-14T20:39:11.000Z"
      },
      {
        "outlet": "SiliconANGLE",
        "title": "Anthropic details unreleased Model 2, new alignment concerns in latest AI risk report",
        "url": "https://urgent.news/2026/08/14/anthropic-details-unreleased-model-2-new-alignment-concerns-in-latest",
        "published": "2026-08-14T23:31:54.000Z"
      }
    ]
  },
  "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."
}