{"slug": "claude-mythos-the-model-anthropic-built-and-decided-not-to-sell", "title": "Claude Mythos: The Model Anthropic Built and Decided Not to Sell", "summary": "Anthropic built an AI model called Claude Mythos that discovered a bug which automated testing had missed across five million runs, and the company chose not to release it, according to a Towards AI report. The model's successor shipped three days before the US government took action, the report states.", "body_md": "It found a bug that automa‍te‍d test‌i‍ng h⁠a‌d run‍ pas​t fi‍ve mi‍llion tim​es. Then, three day​s after​ its success‍or shipp⁠ed, the US…\nContinue reading on Towards AI »", "url": "https://wpnews.pro/news/claude-mythos-the-model-anthropic-built-and-decided-not-to-sell", "canonical_source": "https://pub.towardsai.net/claude-mythos-the-model-anthropic-built-and-decided-not-to-sell-47d301d26da1?source=rss----98111c9905da---4", "published_at": "2026-09-19 21:31:01+00:00", "updated_at": "2026-09-19 21:52:42.448942+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-safety", "ai-policy"], "entities": ["Anthropic", "Claude Mythos", "Towards AI", "US government"], "alternates": {"html": "https://wpnews.pro/news/claude-mythos-the-model-anthropic-built-and-decided-not-to-sell", "markdown": "https://wpnews.pro/news/claude-mythos-the-model-anthropic-built-and-decided-not-to-sell.md", "text": "https://wpnews.pro/news/claude-mythos-the-model-anthropic-built-and-decided-not-to-sell.txt", "jsonld": "https://wpnews.pro/news/claude-mythos-the-model-anthropic-built-and-decided-not-to-sell.jsonld"}}