In November, just a few days before Thanksgiving, Anthropic released Claude Opus 4.5 and naturally my coworkers were curious if it was a significant improvement over Sonnet 4.5. It was very suspicious that Anthropic released Opus 4.5 right before a major holiday since companies typically do that in order to bury underwhelming announcements as your prospective users will be too busy gathering with family and friends to notice. Fortunately, I had no friends and no family in San Francisco so I had plenty of bandwidth to test the new Opus.
This lack of data sharing has reportedly been a bone of contention in trade talks with the US. Google argued that it was unfairly handicapped by the restrictions that allowed local apps like Naver to thrive.
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Силовые структуры
（作者单位：北京大学考古文博学院）
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00295-4