Total Cost per Task combines search cost and model inference cost. Keenable costs about $0.040 per task in both modes: about $0.032 for search (8 searches at $4 per 1k) and about $0.008 for the model. Search is about 80% of the Cost per Task.
On Artificial Analysis Search Index vs. Cost per Task, Keenable (pro) is on the cost frontier: no product scores higher for less. Exa (lite, dynamic highlights) costs about the same and scores 79.