Anthropic's Claude Fable 5: New AI Model & IPO Momentum

Global AI company Anthropic has publicly released its high-performance AI model, Claude Fable 5, which includes new safety features. This move builds momentum for Anthropic ahead of its own initial public offering. Anthropic also launched Claude Mythos 5, a security-focused model. Mythos 5 scored 78% in the ExploitBench test, which measures cybersecurity abilities. This is higher than Mythos Preview's 69% and OpenAI's GPT-5.5 at 34%. Fable 5 has improved programming and analytical capabilities, with an 80.3% success rate in the SWE-Bench Pro coding test. Anthropic previously restricted Mythos due to concerns over misuse. The company states Fable 5 has safeguards for high-risk areas like cybersecurity and biological research. Mythos 5 will be exclusively for companies and institutions in the global security consortium, Project Glasswing. Anthropic recently submitted a confidential IPO filing to the U.S. Securities and Exchange Commission. The company's valuation reached $965 billion in its recent Series H investment round. The bottom line is that Anthropic is actively releasing new models and addressing ethical concerns as it prepares to go public.