The budgets given to Star Wars: The Last Jedi and Rogue One: A Star Wars Story were around $200 million, with Star Wars: The Force Awakens being a bit higher at a $245 million budget.
There is no officially released budget for either Avengers: Infinity War or Solo: A Star Wars Story, only rumors and speculation courtesy of SWNN and The Resistance Broadcast.
If this report is true, and we assume that Solo did have an initial budget of $200 million, then Solo: A Star Wars Story could also become a contender to be the most expensive movie of all time.
While it is safe to assume that the initial budget for Solo: A Star Wars Story was around $200 million, the fact that a majority of the movie was reshot may have skyrocketed the budget.