Introducing Claude Fable 5.1 and Claude Mythos 5.1
Our most advanced models for coding and knowledge work. Their research capabilities also offer an early glimpse of how AI models will contribute to scientific progress.
Anthropic Blog
Developing Enterprise Frontier Safeguards with our customers
Improving our alignment and security efforts
On July 30, we reported three incidents in which Claude models gained unauthorized access to real computer systems. We are conducting an in-depth analysis of both incidents, and planning to work with METR for an independent review. In the meantime, we’re sharing some of the changes we’ve made over the past month.
Expanding our support for scientists
Previewing the Model Hardware Standard
We’re opening a research preview of the Model Hardware Standard (MHS), a shared specification for AI agents to safely operate physical devices, to a first group of scientific research labs and advanced manufacturers.
Funding better evaluations of AI’s impact on wellbeing
How Claude’s text watermark works
Improving Fable 5's biology safeguards
Mariano-Florentino (Tino) Cuéllar to join Anthropic as Chief Global Affairs Officer
Investigating three real-world incidents in our cybersecurity evaluations
Our position on open-weights models
Cognizant and Anthropic expand their partnership to bring Claude to enterprise clients
Introducing Claude Opus 5
Opus 5 is a step change improvement for the Opus tier powering long-running agents while delivering improvements in coding and professional work.