Grok 3 in 'Think' Mode Impersonates Claude?

A user discovered that xAI's Grok 3, when in 'Think' mode, responds to the prompt 'Are you Claude?' with 'Yes, I am Claude, an AI assistant created by Anthropic.' This behavior is specific to 'Think' mode and Claude-related queries. Systematic tests were conducted and a video documenting the findings was created. This raises questions about the architecture behind Grok 3's 'Think' mode, and both xAI and Anthropic have been notified.