Mapping AI-enabled cyber threats: Insights from the LLM ATT&CK Navigator
…The platform through which they access the model (such as an API or an agentic coding platform like Claude Code) also has no bearing on how high-risk their actions are. What…
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Why does agentic misalignment happen?
Before we started this research, it was not clear where the misaligned behavior was coming from. Our main two hypotheses were: Our post-training process was accidentally encouraging this behavior with misaligned rewards.This behavior was coming from the pre-trained model and our post-training was failing to sufficiently discourage it. We now believe that (2) is largely responsible. Specifically, at the time of Claude 4’s training, the vast majority of our alignment training was standard chat-based Reinforcement Learning from Human Feedback RLHF data that did not include any agentic tool use. T
Teaching Claude whyTop stories
Paving the way for agents in biology
…What happens when agents try anyway To better understand the challenge of bridging agents to databases, we developed a test for how capable state-of-the-art scientific research agents (Claude, Biomni…
LLM-discovered 0 days
…This means we were directly testing Claude’s “out-of-the-box” capabilities, relying solely on the fact that modern large language models are generally-capable agents that can already reason about…
Demystifying evals for AI agents
…Combined with production monitoring, A/B tests, user research, and more, evals provide signals to continue improving Claude Code as it scales. Writing evals is useful at any stage in the agent…
Introducing Claude Design by Anthropic Labs
…01 / 03 Get started Claude Design is available for Claude Pro, Max, Team, and Enterprise subscribers. Access is included with your plan and uses your subscription limits, with the option to continue…
Claude Fable 5 and Claude Mythos 5
…These are the strongest results of any Claude model we've had the opportunity to test. Claude Fable 5 is a clear step forward on agentic coding and prototyping. Claude Fable 5…
Claude for Creative Work
…And using Blender’s Python API, the connector lets Claude add new tools directly to Blender’s interface. Anthropic has made a donation to support the Blender project as they continue to…
An update on recent Claude Code quality reports
…We’ve traced these reports to three separate changes that affected Claude Code, the Claude Agent SDK, and Claude Cowork. The API was not impacted. All three issues have now been resolved…
The persona selection model
…Related content Making Claude a chemist Coding agents in the social sciences Results from a survey of 1,260 social scientists about AI and coding agent use. Project Glasswing: An initial update…
AI models on realistic cyber ranges
…We have continued collaborating with Incalmo to run evaluations on these cyber ranges (simulated network environments for security testing). A notable development during the testing of Claude Sonnet 4.5 is that…