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This paper deals with the problem of the συμπλοκὴ τῶν εἰδῶν and the logos in the Sophist. In the first part, after a brief presentation of this problem, I discuss different solutions that have been proposed in the recent literature and show that none of them is completely satisfying. In the second part, I propose and explain a new solution based on a distinction between two types of logos: dialectical logos and doxastic logos. In the third part, I justify this solution on the basis of some passages of the Sophist and of the final part of the Theaetetus. To conclude, I suggest that the distinction between dialectical logos and doxastic logos corresponds with the difference between knowledge and belief explored by Plato in his dialogues.