Anthropic research claims Claude AI can become smarter by 'dreaming'

Anthropic releases research stating that Claude AI agents can improve long-term task performance through a 'dreaming' mechanism, reflecting on historical records, correcting errors, and building knowledge structures during idle time. Claude Opus 5.5 and Sonnet 5.5, after using memory in CL-Bench database question-answering tasks, achieve average scores of 0.838 and 0.833 respectively, outperforming the memoryless baseline of 0.655 and 0.644.