guitar chord
G♯m7♭5
A diminished triad with a minor seventh rather than a diminished one — half diminished, and not the same chord as dim7.
Written the other way round it is A♭m7♭5 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
420402
moderate
420102
moderate
450402
moderate
45440x
moderate · barre
454407
moderate · barre
What is true of it
G♯m7♭5 is G♯, B, D and F♯ — 1, b3, b5 and b7 counted from G♯.
These are also the notes of Bm6/G♯. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
The easiest of the 5 fingerings below is 420402: 4 fingers, held at the 2nd fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
2 of the 5 need a barre.
Where its notes are on the neck
The brass dots are G♯, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
G♯m7♭5/B
x20102
G♯m7♭5/D
xx0102
G♯m7♭5/F♯
220102
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.