166
Opinion of the Court
granted a stay of execution of petitioner's sentence and granted certiorari. 532 U. S. 970 (2001).
II
The Sixth Amendment provides that a criminal defendant shall have the right to "the Assistance of Counsel for his defence." This right has been accorded, we have said, "not for its own sake, but because of the effect it has on the ability of the accused to receive a fair trial." United States v. Cronic, 466 U. S. 648, 658 (1984). It follows from this that assistance which is ineffective in preserving fairness does not meet the constitutional mandate, see Strickland v. Washington, 466 U. S. 668, 685-686 (1984); and it also follows that defects in assistance that have no probable effect upon the trial's outcome do not establish a constitutional violation. As a general matter, a defendant alleging a Sixth Amendment violation must demonstrate "a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different." Id., at 694.
There is an exception to this general rule. We have spared the defendant the need of showing probable effect upon the outcome, and have simply presumed such effect, where assistance of counsel has been denied entirely or during a critical stage of the proceeding. When that has occurred, the likelihood that the verdict is unreliable is so high that a case-by-case inquiry is unnecessary. See Cronic, supra, at 658-659; see also Geders v. United States, 425 U. S. 80, 91 (1976); Gideon v. Wainwright, 372 U. S. 335, 344-345 (1963). But only in "circumstances of that magnitude" do we forgo individual inquiry into whether counsel's inadequate performance undermined the reliability of the verdict. Cronic, supra, at 659, n. 26.
We have held in several cases that "circumstances of that magnitude" may also arise when the defendant's attorney actively represented conflicting interests. The nub of the question before us is whether the principle established by these cases provides an exception to the general rule of
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