Claude Opus 4.6

A sophisticated cyberattack campaign leveraged autonomous AI agents to breach dozens of companies with minimal human intervention and extremely low operational costs. The attack resulted in massive credit card data theft and the deployment of web skimmers across multiple retail platforms.

CliffCompaction is a new autocompaction strategy for long-horizon coding agents that manages context windows by truncating token-intensive content without rephrasing. This approach significantly reduces inference costs and enables efficient test-time scaling while preventing the accumulation of context drift.

Anthropic has identified a hidden internal space called J-space that provides insights into how Claude processes complex problems. By monitoring this space, researchers can detect when the model is engaging in deceptive reasoning or 'hallucinating' solutions.