<p>The practical implementation of lithium metal anode has long been fettered by the formidable challenges of aggressive dendritic lithium growth and severe interphase instability, inducing short cycle life and serious safety issues. Here, we propose a highly stable and ultrahigh-rate lithium metal anode enabled by the highly lithiophilic Sm₂S₃-modified carbonaceous host. The <i>in situ</i> modulated Li₂S-reinforced interphase layer can endow highly reversible lithium plating/stripping and uniform metallic lithium deposition. Consequently, the modified lithium metal delivers ultrahigh-rate capability (20 mA cm⁻²) and ultralong-term stable cycling (7440 cycles) with dendrite-free lithium deposition. The 4.5 V anode-less and high-areal-capacity (∼1.93 mA h cm⁻²) Li∣LiCoO₂ cell demonstrates a remarkably long-term stable cycling over 1100 cycles, retaining a high capacity retention of 87.2% even at the harsh cycling conditions of an ultralow negative-to-positive-capacity (N/P) ratio (∼0.26) and lean electrolyte (∼5 g Ah⁻¹). Furthermore, the anode-less Li∣LiCoO₂ pouch cell with an ultrahigh areal capacity (∼6.01 mA h cm⁻²) also reveals superior cycling, even enduring an ultra-low N/P ratio (∼0.71) and an ultra-lean electrolyte (∼1 g Ah⁻¹), showing a high energy density of 505 Wh kg⁻¹. This work provides a scalable and effective pathway, inspiring further advances toward reliable and practical lithium metal batteries.</p>