Machine Heart

Oct 2, 2026 · Artificial Intelligence

AIBuildAI PostTrain Agent: Autonomous LLM Post-Training Agent Tops PostTrainBench

AIBuildAI's open-source PostTrain Agent autonomously designs and executes LLM post-training pipelines—including data curation, algorithm selection, and hyperparameter tuning—achieving 46.6 on PostTrainBench, surpassing all frontier models and agents, nearing human expert performance (51.1) within 10 hours on a single H100.