tl;dr: OpenDLSS is a Vulkan reimplementation of NVIDIA's DLSS 5 Neural Rendering network (a 71-block Swin/ViT model running FP8 on tensor cores), bit-exact against the original down to all 75 block boundaries. It includes a WebGPU port that achieves the same exact outputs in-browser without tensor cores or FP8, demonstrating that the determinism lives in the spec rather than the hardware. Users must supply their own weights; the repo ships no NVIDIA code, weights, or instructions for obtaining them, and benchmarks on an RTX 4070 SUPER show 7.8 ms at 1080p.