Shorter than 5 inch .45s I have owned and used include Colt Commander, Colt Defender, Springfield Ultra-Compact Ported, Para Slim Hawg, and Para LDA Carry. While I don’t think the Slim Hawg or LDA Carry are currently made, I believe there are current equivalents being sold NIB.
I traded the Colt Defender away after a fairly short trial. It never failed to function for me, and was accurate enough, but I never learned to like it for some unknown reason. I traded the ported SA away after an experiment convinced me I didn't want to carry a ported firearm. I carried the Slim Hawg until I acquired the LDA Carry and eventually traded the Slim Hawg away because the LDA became the EDC choice in .45 (and still is).
Despite the “general indications” of reliability problems (upon which I am by no means casting doubt), the only failure I have had among the above was a broken extractor on the Colt Commander. They have all, otherwise, been perfect for me. The Para LDA is a jewel, as is the Commander. The only choice point of LDA over Commander is that the LDA is that much smaller and easier to carry.
Good luck.
Will