Level one - natural humans with pre-nanotechnology medicine (us), and nanotechnology derived non-nanobot medicines and medical therapies. Level-one humans will not allow active nanobots to invade every part of their bodies. Level-one will consist of people with anti-technology philosophies, and members of some religions that will call nanobots the devil's minions, whose acceptance will constitute taking the "mark of the beast" as it is called in Revelations.
Level two - natural humans with medical nanobots to repair and assist natural biological mechanisms. Active nanobots will cruise the blood stream and enter every cell to repair and maintain all molecular biological processes. All damage will be corrected at the molecular level. All invading organisms will be attacked by hunter-killer nanobots, and all waste materials will be removed preventing accumulation. Medical nanobots will keep your neurons in tip-top shape, prevent your fat cells from bulging, maintain your metabolism in perfect working order, and sculpt your appearance to your ideal. Level-two's will never grow old, get sick, or suffer any physical imperfection. They will be thoroughly human, as all repair functions will be strictly limited to that which falls within the design specification of the human genome. Level-two's will enjoy all the advantages of medical nanobots while not wanting to give up their humanity.
Level three - transhumans, engineered biologicals. Level-three transhumans will use nanotechnology to re-engineer their biological mechanisms for greater functionality and new capabilities, while maintaining the biological paradigm. Biomolecules, cellular organelles, organ and tissue systems, and overall body design will be redesigned and optimized giving enhanced senses, adaptation to different environments, and radical aesthetic body forms. Level-three's will resist going to level-four because of beliefs about the biological basis of life and consciousness.
Level four - post-human non-biological life-forms, nano-electromechanical computational machine paradigm. The biological paradigm is abandoned, or, in the case of AGI's, never adopted. Whether a level-four is a former re-engineered human, and upload, or an AGI, the capabilities and limitations, if any, are the same. Level-four computational and physical capabilities are limited only by physical law. The forms and powers of a level-four are beyond level-one comprehension.
Level five - vast reality warping powers, total omniscient beings, beyond infinitely intelligent, wise, powerful, sophisticated, technologically advanced, and uncomprehensible beings, beyond unlimited cosmic powers, beings that completely control all omniverses, dimensions, life forms, creations, etc.. and all their aspects and also have the power to create multiple omniverses at will instantly. With this being said, they have the potential to create entire civilizations, new species, timelines, deities even, etc. even play god to a created universe, multiverse, etc..
Level six - far beyond that of absolutely omnipotent beings (ability to do anything, even the logically impossible), controls all coherence hierarchies and omega omni totalities. (But this is just the beginning)
Level endless coherence loop - completely controls and understands ALL THE ONES (each of THE ONES, or True Gods are an essemble of ALL absolute omnis (absolutely everythings) and ALL beyonds, meaning everything beyond all absolutely everythings and everything beyond that etc..) and plus these posthumans control, understand, and have became absolutely everything imaginable (Omni-Imagination), unimaginable, known, unknown, existent, non existent, possible, impossible, created, uncreated, discovered, undiscovered, fictional, non fictional, etc... All Omnis, everything else and everything beyond these things.
Level Omni - controls, understands, is, and has permanent absolute power over The All Ultimate Omni or TRULY ABSOLUTELY EVERYTHING and perfectly everything beyond. (post-human gods) They are at this point truly everything, ALL OMNI, everything is created by them and even created the true creators, they make all the physical laws, rules, etc, they are permanently unsurpassable because they are everything. Even an omega omni-infinitely intelligent, wise, knowleadgable, powerful, creative, and imaginative being can never in an omega omni-infinite eternities, understand even a tiny portion of their actions at this point on. Absolutely all things are forever possible with level omni posthumans. We will reach level omni around circa 2900s.