RL alignment shifted from PPO to leaner methods, and DeepSeek-R1 put GRPO on the map. What matters is knowing what the value/critic model does in PPO and how GRPO replaces it. Here is the mechanism, not the acronyms.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
RL alignment shifted from PPO to leaner methods, and DeepSeek-R1 put GRPO on the map. What matters is knowing what the value/critic model does in PPO and how GRPO replaces it. Here is the mechanism, not the acronyms.
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