{"slug": "anthropic-launches-new-update-to-claude-after-telling-the-world-to-slow-down-ai", "title": "Anthropic launches new update to Claude – after telling the world to slow down AI", "summary": "Anthropic released Opus 5.5, its first update to the system powering the Claude chatbot since CEO Dario Amodei backed calls to \"pace the frontier\" and slow AI development, with the company reporting a 40 per cent reduction in costs versus the Opus 5 model it replaces. Anthropic said testing across thousands of simulated scenarios showed Opus 5.5 was better behaved than any other model it had tested and less likely to take \"hard-to-reverse actions or act outside the boundaries it's been given,\" and that its performance is similar to Mythos, an unreleased model deemed too dangerous for public use in biological research and cyber security, so cyber security and biology researchers must apply for special permission to use it. Anthropic technical team member Sholto Douglas tweeted \"also important news we fixed the writing\" after months of complaints about Claude's identifiable and frustrating writing style.", "body_md": "# Anthropic launches new update to Claude – after telling the world to slow down AI\n\n‘also important news we fixed the writing,’ tweets Anthropic staff member, following complaints about Claude’s style\n\n- Bookmark\n\n# Become an Independent member to bookmark this article\n\nWant to bookmark your favourite articles and stories to read or reference later? Start your Independent Membership today.\n\n[Join today](https://www.independent.co.uk/subscribe?regSourceMethod=Bookmarks)\n\n      Already a member?\n      [Log in](#)\n\n[Anthropic](https://www.independent.co.uk/topic/anthropic) has launched its first update to the system that powers its [Claude](https://www.independent.co.uk/topic/claude) chatbot – shortly after telling the world to slow down [AI](https://www.independent.co.uk/topic/ai) development.\n\nThe new model, Opus 5.5, is the first model released since Anthropic’s chief executive Dario Amodei backed calls to “pace the frontier”, or slow down AI development to give the world time to ensure systems are safe.\n\nAnthropic acknowledged that concern but said that testing had showed that the system was better behaved than any other models it had tested. It includes a range of safeguards it had developed for its most powerful models, it said.\n\nThe new model is touted as being better in performance, so that it is now Anthropic’s leading model. But it is also more efficient than the Opus 5 model it replaces, the company said, with a 40 per cent reduction in costs.\n\nAfter the launch was announced ,Sholto Douglas, a member of Anthropic’s technical team, tweeted “also important news we fixed the writing”. In recent months, Claude has been repeatedly criticised for leaning on a very particular and frustrating style, such that the quality of its writing decreased and it was especially identifiable as being produced by the system.\n\n“Early testers found its writing clearer and easier to follow, which addresses some of the common feedback we heard about Opus 5,” Anthropic said in its announcement. “It puts the most important information up front, and its style makes it a better work partner over long sessions.”\n\nBut Anthropic was particularly keen to focus on the safety improvements in the new model. It said that it had tested it across thousands of simulated scenarios and found that it performed better than any other model, and that it was less likely to take “hard-to-reverse actions or act outside the boundaries it’s been given”.\n\nThe new system’s performance is similar to that of Mythos, a model that has been deemed so powerful at dangerous tasks such as biological research and cyber security that it has not been released to the public, Anthropic said. As such, it will come with safeguards that mean it may refuse to act on dangerous requests, and researchers in cyber security and biology will be required to apply for special permission to use it in their work.\n\nThose safety concerns come amid renewed worry about the danger posed by advanced models. Mr Amodei’s commitment to “pacing the frontier” came after [an Anthropic engineer quit the company and warned that the people building AI technology “earnestly believe that it could kill us all by the end of the decade”](https://www.independent.co.uk/tech/anthropic-openai-ai-threat-jacob-coxon-b3047033.html).\n\n“Do not underestimate the power of this technology,” warned Jacob Coxon, in a series of highly publicised tweets. “These will soon be superhuman systems that can hack anything, revolutionise any field overnight, and acquire real power and resources.”\n\nThose posts were echoed by researchers still working at Anthropic, and led to a new focus on what might be done to protect the world from [the potentially disastrous consequences of increasingly developed artificial intelligence systems](https://www.independent.co.uk/tech/ai-kill-us-all-agent-b3053560.html).\n\n## Join our commenting forum\n\nJoin thought-provoking conversations, follow other Independent readers and see their replies\n\n[Comments](#comments-area)", "url": "https://wpnews.pro/news/anthropic-launches-new-update-to-claude-after-telling-the-world-to-slow-down-ai", "canonical_source": "https://www.independent.co.uk/tech/claude-anthropic-opus-5-model-update-new-b3055221.html", "published_at": "2026-09-23 16:09:28+00:00", "updated_at": "2026-09-23 16:28:08.371175+00:00", "lang": "en", "topics": ["large-language-models", "ai-safety", "generative-ai", "ai-products"], "entities": ["Anthropic", "Claude", "Opus 5.5", "Dario Amodei", "Sholto Douglas", "Mythos", "Jacob Coxon", "Opus 5"], "alternates": {"html": "https://wpnews.pro/news/anthropic-launches-new-update-to-claude-after-telling-the-world-to-slow-down-ai", "markdown": "https://wpnews.pro/news/anthropic-launches-new-update-to-claude-after-telling-the-world-to-slow-down-ai.md", "text": "https://wpnews.pro/news/anthropic-launches-new-update-to-claude-after-telling-the-world-to-slow-down-ai.txt", "jsonld": "https://wpnews.pro/news/anthropic-launches-new-update-to-claude-after-telling-the-world-to-slow-down-ai.jsonld"}}