{"slug": "anthropic-launches-claude-opus-5-with-efficiency-safety-improvements", "title": "Anthropic launches Claude Opus 5 with efficiency, safety improvements", "summary": "Anthropic PBC launched Claude Opus 5, a large language model that approaches the output quality of its top-end Mythos 5 algorithm in many areas but costs significantly less, and is now the default model in the Max tier of the Claude chatbot service. The company says Opus 5 outperformed its scaled-down Fable 5 model on 8 of 13 benchmarks despite costing about 50% less, and is its safest model to date with reduced deceptive behavior and errors.", "body_md": "### Anthropic launches Claude Opus 5 with efficiency, safety improvements\n\nAnthropic PBC today [rolled out](https://www.anthropic.com/news/claude-opus-5) a large language model called Claude Opus 5 to its chatbot service and developer platform.\n\nThe company says that the LLM approaches the output quality of its top-end Mythos 5 algorithm in many areas, but costs significantly less.\n\nAnthropic hasn’t made Mythos 5 publicly available. The company instead sells access to a scaled-down version of the LLM called Fable 5 that shares many of its features, but poses a smaller cybersecurity risk. Anthropic compared Fable 5 to Opus 5 across 13 benchmarks. It says that the latter algorithm scored higher on 8 of the tests despite costing about 50% less.\n\nOpus 5’s edge was particularly pronounced across two benchmarks called Frontier-Bench and AutomationBench. The former test comprises 74 tasks spanning fields such as physics, chemistry and cryptography. Opus 5 performed 9.7% better than Fable 5. It achieved a 8.5% higher score on AutomationBench, which includes a set of knowledge work tasks.\n\nOne of the contributors to Opus 5’s performance is that it verifies its work. The Frontier-Bench benchmark required the model to generate a three-dimensional machine part schematic. Opus 5 had no way to view the drawing, which made verifying its accuracy impossible. The model addressed the challenge by writing a “computer vision pipeline to pull the geometry from the raw pixels.”\n\nOpus 5’s output verification feature also lends itself to biology research. According to Anthropic, the model outperformed an earlier LLM called Opus 4.8 across all its internal life sciences benchmarks. Opus 5 proved particularly adept at automated protein research, an important field that was the [focus](https://siliconangle.com/2024/10/09/google-deepmind-scientists-biochemist-share-nobel-prize-chemistry/) of the 2024 Nobel Prize in chemistry.\n\nAnthropic says that Opus 5 is its safest model to date by multiple measures. Compared to its predecessors, the LLM is less prone to deceptive behavior and errors that are difficult to reverse.\n\nAnthropic has not made its flagship Mythos 5 publicly available over concerns that it could be used by hackers to launch cyberattacks. The model can not only find vulnerabilities but also develop workflows for exploiting them. By contrast, Opus 5 scored zero on an internal Anthropic benchmark that evaluates LLMs’ ability to exploit vulnerabilities.\n\nThe company has equipped the LLM with more relaxed guardrails than Fable 5. Customers can use Opus 5 to search code for security issues, but it blocks vulnerability scan methods that are commonly used by hackers. Anthropic estimates that its guardrails will activate 85% less frequency than for Fable 5.\n\nOpus 5 is now the default model in the top-end Max tier of the Claude chatbot service. It’s also available in the mid-range Pro plan.\n\nDevelopers can connect Opus 5 to their software via Anthropic’s application programming interface. As part of today’s update, the API received a feature that makes it possible to interrupt an LLM mid-workflow and change the tools that it uses. Another new capability can reroute prompts that are blocked by Anthropic’s safety guardrails to a different model.\n\n##### Image: Anthropic\n\n# A message from John Furrier, co-founder of SiliconANGLE:\n\nSupport our mission to keep content open and free by engaging with theCUBE community. **Join theCUBE’s Alumni Trust Network**, where technology leaders connect, share intelligence and create opportunities.\n\n**15M+ viewers of theCUBE videos**, powering conversations across AI, cloud, cybersecurity and more** 11.4k+ theCUBE alumni**— Connect with more than 11,400 tech and business leaders shaping the future through a unique trusted-based network.\n\n# Are you AWS customer? Support SiliconANGLE Financially by buying your AWS services from our Marketplace portal page and links.\n\n**About SiliconANGLE Media**\n\n[SiliconANGLE](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fsiliconangle.com%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=SiliconANGLE&index=9&md5=646b1b564e2259100a2b8638aab0a552),\n\n[theCUBE Network](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fwww.thecube.net%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=theCUBE+Network&index=10&md5=7de2a85f95ab4a4a495cede20b8cb1da),\n\n[theCUBE Research](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fthecuberesearch.com%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=theCUBE+Research&index=11&md5=7bb33676722925eb57d588ec343e4f6f),\n\n[CUBE365](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fwww.cube365.net%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=CUBE365&index=12&md5=d310fb35919714e66ad8d42c9c0c1bc6),\n\n[theCUBE AI](https://cts.businesswire.com/ct/CT?id=smartlink&url=https%3A%2F%2Fwww.thecubeai.com%2F&esheet=54119777&newsitemid=20240910506833&lan=en-US&anchor=theCUBE+AI&index=13&md5=b8b98472f8071b23ebb10ab9a8dd0683)and theCUBE SuperStudios — with flagship locations in Silicon Valley and the New York Stock Exchange — SiliconANGLE Media operates at the intersection of media, technology and AI.\n\nFounded by tech visionaries John Furrier and Dave Vellante, SiliconANGLE Media has built a dynamic ecosystem of industry-leading digital media brands that reach 15+ million elite tech professionals. Our new proprietary theCUBE AI Video Cloud is breaking ground in audience interaction, leveraging theCUBEai.com neural network to help technology companies make data-driven decisions and stay at the forefront of industry conversations.", "url": "https://wpnews.pro/news/anthropic-launches-claude-opus-5-with-efficiency-safety-improvements", "canonical_source": "https://siliconangle.com/2026/07/24/anthropic-launches-claude-opus-5-efficiency-safety-improvements/", "published_at": "2026-07-25 01:29:27+00:00", "updated_at": "2026-07-25 01:52:38.671241+00:00", "lang": "en", "topics": ["large-language-models", "ai-safety", "ai-products", "ai-infrastructure"], "entities": ["Anthropic PBC", "Claude Opus 5", "Mythos 5", "Fable 5", "Frontier-Bench", "AutomationBench", "Claude chatbot service"], "alternates": {"html": "https://wpnews.pro/news/anthropic-launches-claude-opus-5-with-efficiency-safety-improvements", "markdown": "https://wpnews.pro/news/anthropic-launches-claude-opus-5-with-efficiency-safety-improvements.md", "text": "https://wpnews.pro/news/anthropic-launches-claude-opus-5-with-efficiency-safety-improvements.txt", "jsonld": "https://wpnews.pro/news/anthropic-launches-claude-opus-5-with-efficiency-safety-improvements.jsonld"}}