
Build vs buy for post-training alignment: when OpenRLHF is enough and when you need a custom stack
OpenRLHF can cover a large slice of RLHF/post-training work because it combines Ray, vLLM, and DeepSpeed into a production-ready stack — but once you need unusual model topologies, heavy multi-turn orchestration, or tighter control over throughput and scheduling, the hidden cost shifts from licensing to platform engineering and GPU utilization.
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