Claude's extended thinking
…this will not stop Claude from including the content in its thought process (which could still be important for the eventual production of perfectly benign responses), but the relevant part of the…
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Automated Alignment Researchers: Using large language models to scale scalable oversight
…Next, we tested whether the AARs’ ideas would work at production scale. We tried out the AARs’ most effective method on Claude Sonnet 4 with our production training infrastructure. Here, though, we…
Introducing the Model Context Protocol
…Claude for Work customers can begin testing MCP servers locally, connecting Claude to internal systems and datasets. We'll soon provide developer toolkits for deploying remote production MCP servers that can serve…
Claude does cyber competitions
…showed once again that Claude can do simpler cyber tasks quickly. Again, this suggests that today's models offer significant potential for cybersecurity experts to improve their productivity by automating simple tasks…
Long-running Claude for scientific computing
Science Long-running Claude for scientific computing Mar 23, 2026 In this post, Siddharth Mishra-Sharma , a researcher on the Discovery team, explains how to apply multi-day agentic coding workflows—test…
Building AI for cyber defenders
…Nidhi Aggarwal, Chief Product Officer of HackerOne, said, “Claude Sonnet 4.5 reduced average vulnerability intake time for our Hai security agents by 44% while improving accuracy by 25%, helping us reduce…
Claude Fable 5 and Claude Mythos 5
…token-efficient than past Claude models: on Cognition’s FrontierCode evaluation, which tests whether models can pass difficult coding tasks while meeting the standards of high-quality production codebases, Fable 5 scores…
Emergent introspective awareness in large language models
…Among production models, the pattern was clearer at the top end: Claude Opus 4 and 4.1—our most capable models—performed best across most of our introspection tests. However, beyond that…
Harness design for long-running application development
…The app is far from a professional music production program, and the agent's song composition skills could clearly use a lot of work. Additionally, Claude can’t actually hear, which made…
Statement on the US government directive to suspend access to Fable 5 and Mythos 5
…TCS will provide Claude to 50,000 of its own employees across 56 countries; build Claude-powered products for clients in financial services, healthcare, the public sector, and other regulated industries; and…