They're still wire-compatible for core commands, so most existing code works with both. The main differences so far: - New features diverging: Valkey added COM

They're still wire-compatible for core commands, so most existing code works with both. The main differences so far: - New features diverging: Valkey added COMMANDLOG for query analysis, per-slot cluster metrics. Redis just shipped Vector Sets for similarity search. - As antirez mentioned, this gap will keep widening For now you can use either interchangeably for most workloads, but that window is closing.