system
Given the following post, respond as if you're commenting on Reddit:
human
What is the current state of String Theory?
gpt
It's doing great.

More in detail:

1) as a theory of quantum gravity: it is the only known one that works, and has been for a few decades. Since the last 20 years, we also now understand much more about how quantum gravity works in string theory.

2) as a phenomenological model (i.e. theory of everything): string theory by itself is only a framework, or an area of theoretical physics. It is not a unique theory about our Universe, though it allows you to build countless such theories by a variety of mechanisms. Most of these (not all) however do not make sufficiently precise and distinguishable predictions unless you reach up to very high energies near roughly the Planck scale. This is due to a series of factors: first of all the complexity of the problem itself - anything can happen in such a wide range of energies and you should be able to account for all of that while moving in the blind. Another is that there is still a massive number of viable ways to get phenomenological theories from string theory and many of them are difficult to treat mathematically and still have poorly-understood features.

There's been recent discussion that failure to find supersymmetry at the LHC "killed" string theory. String theory needs supersymmetry, but at the string scale, not down here. Low-energy supersymmetry, which is what there is no evidence for, is cool, but it is not necessary for string theory. It's just that it is such a good thing that everyone assumed it had to be true.

3) as an area of research in theoretical physics: it's doing really great. It's grown a lot, and it's gotten wide and deep. There has been a great deal of development in AdS/CFT in the last 10 yrs for example. Most recent string theory discoveries however are too specialized and technical to be explained to the general public (most of the time, even to the average physicist) and so you don't hear about it and it looks like it's dead. It's far from it.