Show HN: LLM post-training to speak like GenZ, costing less than a cup of coffee

Hello everyone! I post-trained small LLM (Qwen Instruct 2.5 0.5B) to speak like GenZ using SFT+RL. Training was done in Google Colab using the cheapest GPU runtime.

Honestly, you could probably get better results with simple prompting of frontier models, as I wasn’t optimizing for results with the smallest model, cheapest GPU and synthetic data. But it was a good and fun learning exercise: how you can actually run RL to improve models without huge investments using the current advancements in AI, tooling and infrastructure.

Overall, it cost me Notebook example is on Github, feel free to give it a try in your own free plan!