A 4B Open Model Matches GPT-5.6 Sol on Retrieval at 100× Lower Cost
How Castform and Neon use RL post-training, hybrid search, and existing company data to turn small open models into specialized retrieval agents.
Aug 27, 20269 min read3

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How Castform and Neon use RL post-training, hybrid search, and existing company data to turn small open models into specialized retrieval agents.

Token optimization is a context engineering problem, not a prompt-shortening contest — and the two levers most developers never touch will cut your AI bill by 70%
