Tesla (TSLA) reported a significant Q4 2025 earnings decline with revenue down 3% YoY and adjusted EPS down 17% YoY, alongside a 16% drop in vehicle deliveries. Despite these challenges, the company achieved record energy storage deployments and maintained a 20.1% gross margin, while also investing $2 billion in xAI. Investors should monitor the impact of declining vehicle sales against growth in energy storage and AI investments.