We’re at an inflection point in AI’s impact on cybersecurity. Claude now outperforms human teams in some cybersecurity competitions, and helps teams discover and fix code vulnerabilities. At the same time, attackers are using AI to expand their operations.
@anthropicai
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Claude Sonnet 4.5 Advances Defensive Cybersecurity Skills
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We’ve focused on improving Claude’s skills in defensive cybersecurity. The results of this are visible in Claude Sonnet 4.5, which is comparable or superior to Opus 4.1 in cybersecurity tasks—yet both faster and cheaper. Read more:
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Chris Ciauri Joins Anthropic as Managing Director International
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Chris Ciauri is joining Anthropic as our Managing Director of International. He joins during a period of rapid global expansion for Anthropic, as we triple our international headcount across Dublin, Tokyo, London, and Zurich. Read more:
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Claude Sonnet 4 and Opus 4.1 in Microsoft 365 Copilot
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Claude Sonnet 4 and Opus 4.1 are now available in Microsoft 365 Copilot, bringing Claude’s advanced reasoning capabilities to millions of enterprise users. Read more:
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Chan Zuckerberg Initiative Partners on AI Classroom Challenges
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We're partnering with Learning Commons from the Chan Zuckerberg Initiative—addressing some of the biggest challenges we hear about from K–12 teachers about AI in the classroom:
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Anthropic launches interactive economic index data tool
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If you'd like to explore the Anthropic Economic Index data yourself, our new interactive site is here: http://
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Anthropic Economic Index: AI usage analysis by US state
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New from the Anthropic Economic Index: the first comprehensive analysis of how AI is used in every US state and country we serve.
— Anthropic (@AnthropicAI) 15 septembre 2025
We've produced a detailed report, and you can explore our data yourself on our new interactive website. pic.twitter.com/YI2qXIQzJONew from the Anthropic Economic Index: the first comprehensive analysis of how AI is used in every US state and country we serve. We've produced a detailed report, and you can explore our data yourself on our new interactive website.
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Claude usage surges to 39% complete task delegation
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In our report, we find that people delegate complete tasks to Claude 39% of the time—up from 27% just eight months ago. Meanwhile, DC and Utah lead the US in Claude use per capita. Read more:
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Claude Opus 4 Testing Reveals Vulnerabilities, Strengthens AI Safeguards
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Their ongoing testing of models like Claude Opus 4 and 4.1 has helped us find vulnerabilities and build strong safeguards before deployment. Read more:
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Public-Private Partnerships Strengthen Secure AI Development Standards
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Our collaboration with the US Center for AI Standards and Innovation (CAISI) and UK AI Security Institute (AISI) shows the importance of public-private partnerships in developing secure AI models.