Giths
Githyanki are an extraplanar race of near-humans who were imprisoned and enslaved by Mind Flayers for many millenia before finding their freedom. They live as aesthetic warrior monks in the Astral Plane.
Githzerai are an extraplanar race of near-humans who were imprisoned and enslaved by Mind Flayers for many millenia before finding their freedom. They live as aesthetic warrior monks in the Elemental Chaos of Limbo.
Clearly, they are different enough to be considered separate species.
Giths
Githyanki are an extraplanar race of near-humans who were imprisoned and enslaved by Mind Flayers for many millenia before finding their freedom. They live as aesthetic warrior monks in the Astral Plane.
Githzerai are an extraplanar race of near-humans who were imprisoned and enslaved by Mind Flayers for many millenia before finding their freedom. They live as aesthetic warrior monks in the Elemental Chaos of Limbo.
Clearly, they are different enough to be considered separate species.