Best AI for discovery responses?

So far I am disappointed with CoCounsel (responses are way too vague/kinda point in a general direction as opposed to precise language), so instead I have been relying on GC.ai, which is weird as it is not even meant as a litigation wrapper. But the quality of the responses is so much better. What else is out there? Other than Claude, which is out of my price range for its ZDR option, unfortunately… I am looking for an AI that can not only create properly formatted responses, but that can also engage with case-relevant documents and “think up” a proper factual response, not just a placeholder. A friend recommended Litmas, but it is priced per case so that seems expensive. Thoughts?