I very much doubt the Alg-Mali border is open - and even if it was, north Mali is still an area you want to avoid.
I dont recall anyone crossing via Assamaka this year, but I don't think border is actually closed. Plus it's only half a day's ride on the piste to Arlit (highway) where you ought to be in the clear, so the exposure is brief.
Last year some got shafted by the Assamaka officials into paying for an expensive escort to Arlit, but I think the situation was much worse then.
From Arlit to Agadez, if official army escorts are still running, you don't pay. Beyond there, who knows, but I get the feeling the hot spot may have moved to north Nigeria.