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Anthropic has recently acknowledged a performance decline in its Claude Opus4.1 and Opus4 models from August 25th to 28th, where users reported diminished answer quality, formatting issues, and malfunctions in tool functionalities. Following a thorough investigation, the issue was attributed to an attempted update of the reasoning stack. In response, the company has swiftly initiated an emergency rollback of Opus4.1 and commenced efforts to rectify the Opus4.0 version. Anthropic underscores that user experience remains its top priority and vows to consistently uphold the quality of its model responses. This incident highlights the crucial importance of AI model quality and stability, and Anthropic's prompt action serves as a commendable example within the industry.
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