TrainRL — Post-training ResearchIndependent research on LLM post-training, reinforcement learning, environments, evaluation, and specialist agents.https://trainrl.com/2026-08-27T12:00:00-07:00Vikram Kharvihttps://trainrl.com/LLM Post-Training: What It Is, Why It Matters, and When to Use Ithttps://trainrl.com/post-training-stack2026-08-13T12:00:00-07:002026-08-27T12:00:00-07:00What post-training is, why it matters, how reinforcement learning fits, what each method costs, and when simpler system changes are better.