According to @CNBC, European markets are set to open mixed amid concerns over AI valuations (source: CNBC). According to @CNBC, the report highlights valuation worries in AI-related names as the primary driver of the mixed open, without specifying individual stocks in the post (source: CNBC). According to @CNBC, the post does not reference BTC, ETH, or broader crypto flows, so any cryptocurrency market impact is not specified by the source (source: CNBC).