The ggml-org team has released llama.cpp b11809, adding support for Q2_0 to its WebGPU backend. The change covers both row dequantization and matrix multiplication, the release notes say. They provide no speed, hardware-compatibility or memory-use results, so the practical performance impact is unclear.
Why it matters
Developers using llama.cpp with WebGPU can try Q2_0 models, but the release notes do not say how well they will run on specific devices.