Claude Opus 4.5 is launched as a cutting-edge AI model designed for coding, research, and office tasks. It boasts significant improvements in efficiency, reasoning, and task management, making it accessible for developers and enterprises at a competitive price. The model excels at complex workflows, demonstrating advancements in self-improving abilities and safety measures.

In 1982, the Lisa software team implemented a system to track engineers' productivity based on the lines of code written weekly. Bill Atkinson, a key developer, opposed this metric, believing it encouraged poor coding practices. After optimizing a component of the software and reducing the code by 2,000 lines, he humorously reported his productivity as -2000, leading to the management ceasing their requests for his reports.