expand_less Tier 0: Nothing (no reviewed class is this powerful, but they can be with certain capstones like the spellvampire shifter's Forever Evolving)
Tier 0.5: 
Tier 1: Psion (w/ Psychic Reformation), Wilder (w/ Psychic Reformation)
Tier 1.5: Psion, Taskshaper
Tier 2: Harbinger, Mystic, Wilder (w/ Student's Surge, Human FCB), 
Tier 2.5: Aspect, Channeler, Eclipse (w/ occultation), Occultist (by Radiance House), Rajah, Sage (w/ ki clone), Shadow Weaver, Spiritualist (by Drop Dead Studios), Stalker, Voyager, Warder, Wilder, Zealot
Tier 3: Cryptic, Daevic (w/ Knowledge Passion), Dilettante, Dread (w/o fear immune enemies), Enlightened Scholar (w/ spellcasting), Fey Adept, Highlord, Incanter, Medic, Psychic Warrior, Soul Weaver, Tactician, Thaumaturge, Vitalist, Vizier, Warlord
Tier 3.5: Aegis, Armiger, Armorist, Blacksmith, Commander, Conscript, Dragoon, Eclipse (w/o occultation), Elementalist, Eliciter, Hedgewitch, Guru, Mageknight, Mountebank, Necros, Nexus, Prodigy, Radiant, Reaper, Sage (w/o ki clone), Scholar, Sentinel, Shifter (by Drop Dead), Dead Studios), Soulknife (Gifted Blade), Blade),Spiritualist, Stormbound, Striker, Symbiat, Technician, Thaumaturge (Savant), Troubadour, Wraith, Zodiac (Lunar)
Tier 4: Daevic, Demon Hunter, Echo, Marksman, Vampire Hunter, Voltaic, War Dancer, Zodiac (Solar)
Tier 4.5: Enlightened Scholar (w/o spellcasting), Kineticist, Kusa, Soulknife, Successor
Tier 5: Paramour, Vauntguard
Tier 5.5: Dread (w/ fear immune enemies)
Tier 6: 
Others: