Fulcrum's training approach is brilliant: the base model already knows how to write, so both SFT and RL are tailored to the precise distinction between the default LLM voice and authors' voices. Smart customization can be both cheap and effective.
Tinker praises Fulcrum's cheap, effective style-customization training approach
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Tinker says Fulcrum trains its Echo writing model by building on a base model that already writes well, tailoring both SFT and RL to separate the default LLM voice from authors' voices. The post calls this customization approach both cheap and effective. Fulcrum says Echo beats frontier models at writing tasks such as fiction and technical explanations, at a training cost under $5K.
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@tinkerapi
Say hello to Echo, the best writing model at style imitation. Echo beats frontier models at writing tasks ranging from fiction to technical explanations, despite costing less than $5K to train.
Source: Tinker · x.comPublished · added here