According to @cas_abbe, the BTC/SPX ratio has held above its 2021 cycle high and continues to make higher highs and higher lows, signaling sustained relative strength for Bitcoin versus the S&P 500, source: @cas_abbe on X, Sep 13, 2025. He notes the S&P 500 printed a new all-time high yesterday, which he sees as positioning Bitcoin to challenge its own highs next, source: @cas_abbe on X, Sep 13, 2025. He expects BTC to vastly outperform SPX in 2025, consistent with its relative surge in Q4 2024, source: @cas_abbe on X, Sep 13, 2025. For traders following this view, key focus is the BTC/SPX 2021 cycle high as support and the sequence of higher lows for trend validation, with positioning tilted toward BTC over SPX if relative strength persists, source: @cas_abbe on X, Sep 13, 2025.