# PPO vs GRPO, Simply Explained

DevFeed: [PPO vs GRPO, Simply Explained](<https://devfeed.tech/articles/ppo-vs-grpo-simply-explained-41275.md>)

Original publisher: [Read original article](<https://www.intoai.pub/p/ppo-vs-grpo-simply-explained>)

Author: Dr. Ashish Bamania

Published: 2026-09-17T11:47:38Z

Content type: tutorial

Language: en

Sources: [Into AI](<https://devfeed.tech/sources/into-ai.md>)

Topics: [Large Language Model](<https://devfeed.tech/topics/llm.md>), [post-training](<https://devfeed.tech/topics/post-training.md>), [Reinforcement learning](<https://devfeed.tech/topics/reinforcement-learning.md>), [Algorithms](<https://devfeed.tech/topics/algorithms.md>)

Tags: [algorithm](<https://devfeed.tech/tags/algorithm.md>), [alignment](<https://devfeed.tech/tags/alignment.md>), [human-feedback](<https://devfeed.tech/tags/human-feedback.md>), [llm](<https://devfeed.tech/tags/llm.md>), [llm-training](<https://devfeed.tech/tags/llm-training.md>), [post-training](<https://devfeed.tech/tags/post-training.md>), [reinforcement-learning](<https://devfeed.tech/tags/reinforcement-learning.md>), [training](<https://devfeed.tech/tags/training.md>)

## AI overview

A tutorial comparing PPO and GRPO as reinforcement learning algorithms used in LLM post-training. It explains PPO, including RLHF, policy-gradient updates, and clipped token-probability changes intended to keep model behavior close to its previous version.

## Source excerpt

A simple lesson on two important LLM post-training algorithms.