A major topic of research discussion is the question of whether the model of the ideal state was intended as a pure utopia, the realization of which Plato did not seriously consider, or whether he intended to make its implementation appear practicable. Opinions differ widely on this. The text offers evidence for both interpretations. The question of practicability is discussed variously in the dialogue, with different views coming to the fore. The spectrum of modern interpretations ranges from the assumption that Plato wanted to demonstrate impracticability to the hypothesis that he wanted to provide a concrete plot for contemporary constitutional reform. Some interpreters, including Leo Strauss, even believe that it is an "anti-utopia" that Plato neither considered possible nor desirable; his depiction of the utopian state as an ideal should be understood ironically. According to one school of thought, Plato's main concern was not political, but ethical; the model of the state is not to be understood as a political program, but as a symbol of desirable inner-soul conditions.
There is also a lively discussion of the interpretation of Plato's fundamental poetic criticism of Socrates. This makes an ambivalent impression. Socrates points to an "old dispute" that exists between philosophy and poetry. On the one hand, he repeatedly presents his criticism of poetry with great emphasis and gives detailed reasons for it, but on the other hand he puts it into perspective: he confesses that he has felt love and reverence for Homer since his youth, expresses his regret that there is no place for poets in the ideal state, and emphasizes that he would be glad to be convinced if poets or poet friends succeeded in showing that poetry does fulfil a useful function in society.
One topic of modern philosophical debate is the meaning of the "noble lie" recommended by Socrates, the invention of myths and inaccurate claims by philosopher-rulers for the purpose of salutary influence on the minds of the governed. This problematic is embedded in the question of the philosophical understanding of truth and fictionality. At issue is the function of myths in Plato's discourse, the relationship between literal and symbolic truth, and the tension between the "noble lie" and the love of truth that Plato also recommends. Plato accepts and recommends myths and, in the literal sense, inaccurate claims when they are in the service of what he sees as a higher-order truth. Higher-order philosophical truth is good in and of itself and always desirable. Non-philosophical truths, on the other hand, are to be judged according to their respective utility; they are valuable only if they promote virtuous behavior.
Kai Trampedach points to the "anti-politics" of the ideal state, which is in the sharpest contradiction to the Greek concept of the political, since it separates citizen status, service in arms, and authority to rule from each other completely and fundamentally. Not only in the lowest rank, but also among the guards, the actually political had no space, and even among the rulers a space of communicative decision-making was missing. The consensus of the philosopher-rulers, which exists on the basis of knowledge, leaves politics no starting point and makes political institutions superfluous.
Plato's understanding of the role of women in state and society is controversial. One line of research, whose spokesman is Gregory Vlastos, regards him as a "feminist". Other researchers, in particular Julia Annas, strongly disagree with this designation. What is essential here is how one defines the term feminism. In today's common sense of the term, Plato's position is not feminist, but by the standards of the conditions and ways of thinking of the time, he appears to be an advocate of women's emancipation, for he wanted to open access to all offices in the ideal state to women. Considering the status of women at the time, Plato's proposals were revolutionary, for in democratic Athens women could not participate in the popular assembly or hold political office. Moreover, among the upper classes, women's roles were largely limited to performing domestic tasks and they had few educational opportunities. For women guardians in the ideal state, on the other hand, inclusion in public life was foreseen.
The abolition of private property among the guardians and the rulers is often compared to the economics of modern communism. In this context, Plato has been called the "first communist". In more recent research, however, it is emphasized that in the ideal state the lowest estate, which is responsible for the entire production of goods, is organized in private enterprise and, in particular, no collectivization of agriculture is envisaged. Therefore, the term "communism" is inappropriate.
Of central importance is Plato's definition of justice as a principle of order in the soul and consequently also in the state. In this way, his concept of justice differs fundamentally from all approaches that define justice with reference to social behavior. Although for Plato the existence of just order necessarily results in virtuous social action, this does not constitute justice, but is only an effect of it.
It is disputed whether Plato's Socrates, in his defense of justice, commits a fallacy of equivocation by not always using the term "justice" in the same sense in his argumentation, but partly in the sense of the common understanding of the time ("vulgar justice"), partly in the sense of his own ("Platonic justice").
A major innovation in the Politeia is the introduction of the model of the tripartite soul. In earlier works Plato had treated the soul as a unity. The detailed justification of the new model, which is supposed to explain the irrational forces in the soul, is probably due to the novelty of the idea. Difficult to determine is the relationship of the tripartite model to the doctrine of immortality; intensely debated is the question of how Plato reconciled the tripartite nature of the soul with its unity, indestructibility, and incorporeal existence.
