They have a $60/$120 Fixed Limit game at the MGM Grand in Maryland/D.C. It looks like a pretty big game. I used to play 30/60 FLHE in Colorado, years ago and I would bring 30-40 big bets with me. So for this D.C. game, I'm assuming you bring about 4 or 5 grand to play with.

Curious, has anyone tried to GTO fixed limit? Is it easier to do because of the fixed bet sizes?

The current state of things for fixed limit, as far as I know, is that there is a HU bot that is known to play extremely close to GTO. This is far closer to solving the game than in NL where we have bots that can beat humans HU but we have no idea how close to GTO they are.

Multi-way is still a mystery in both games, I think.

Heads-up fixed limit hold'em was solved in 2015 (not approximately solved like PIOsolver does for NL hold'em) but fully mathematically solved, afaik. Not sure what other variants of limit hold'em have been fully solved since then but I imagine it's all super high accuracy pseudo solved, but again not sure how easy it is to find GTO material on limit hold'em considering it's only played live essentially.

Technically not fully mathematically solved, but the "solved" strategy is mathematically proven to play extremely close to the actual solution--as you say, much different than the NL solvers.

hu limit was solved in mostly the same manner that hu postflop solvers work. It just uses a ton of compression to fit the game in ~10tb and then stores memory on disk (distributed across nodes) instead of ram. One of the authors created jesolver

http://jeskola.net/jesolver_beta/

The hu limit solution has a nash distance that is just like the nash distance that commercial solvers have. They said that the nash distance is small enough that you could play best response vs it for a lifetime and still not be able to say that you are beating it with statistical significance. They also showed some math that an exploitability of 0.1bb/100 is small enough to meet for that to be true.

multiway limit could be done in the same manner that pluribus did no limit, but i don't think anyone has done so