Neon Teams Up with Castform to Train a 4B Document Search Small Model: Accuracy Exceeds GPT-5.6, Cost is Just 1% of It

Neon and Castform collaborated to train a 4B open-source model using reinforcement learning, achieving document search accuracy comparable to or surpassing GPT-5.6Sol, with inference cost only 1% of it. This shift from vector embedding to agentic search lets the model autonomously execute retrieval.....