Both Luna and Haiku are more expensive than DS4.1 Flash at API cost. But ignore that; nobody should be using API. The open weight subscriptions for DS4.1 Flash provide higher limits at lower prices than OpenAI or Anthropic subscriptions. Finally, Haiku actually is far less token efficient/ outputs more per task. No matter how you slice it, the open weight is cheaper.
Also consider that for things like cyber work, the frontier models give you nerfed results and poor performance. Whereas the open weight isn't nerfed, and I routinely get 200t/s with my subscription. Finally, DS4.1 Flash is natively multimodal, while Haiku isn't.
They're all perfectly fine models, you should use any one of them you want. But DS4.1 Flash can do more for less. (That said: GLM-5.3-Flash is even better and cheaper...)
Also consider that for things like cyber work, the frontier models give you nerfed results and poor performance. Whereas the open weight isn't nerfed, and I routinely get 200t/s with my subscription. Finally, DS4.1 Flash is natively multimodal, while Haiku isn't.
They're all perfectly fine models, you should use any one of them you want. But DS4.1 Flash can do more for less. (That said: GLM-5.3-Flash is even better and cheaper...)