Claude Duet is the first personal-assistant-type harness that feels useful

Claude Duet is highlighted as a groundbreaking personal assistant, distinguishing itself with rapid response times, even when background tasks are necessary. The author notes that Duet, supposedly powered by Opus 5.5, performs significantly faster than Opus in other Claude UIs, suggesting specialized tuning. This speed is deemed crucial for a useful assistant, as it avoids user waiting times between commands. The product's hierarchical agent arrangement is praised as a natural and effective feature, potentially becoming a standard for future chatbot interfaces.