Gods of the highest heaven - A kind of Vaimā- nika Devas (Empyrean gods);
the Empyrean (Vaimānika) gods living in the Anuttara Vimāna (the highest heaven of the Empyrean gods); they are Kalpātīta Deva (Empyrean gods free from hierarchy);
the Devas who are superior to others in respect of life-span, influence, effulgence etc... They are of five types.
Vijaya, Vaijayanta, Jayanta, Aparājita and Sarvārthasiddha.
...vijayā vejayaṃtā ya jayaṃtā aparājiyā...
savvaṭṭhasiddhagā ceva paṃcahāṇuttarā surā. ii vemāṇiyā devā...
na vidyante uttarā - pradhānā sthitiprabhāvasukhadyutileśyādibhirebhyo'nye devā ityanuttarāḥ.
(U 36.215,216 ŚāVṛ Pa 702)