Under the Sixth Amendment, when do you have the right to an attorney in a criminal proceeding?

The Sixth Amendment guarantees the right to counsel at all critical stages of a criminal prosecution after formal charges have been filed, including arraignment, preliminary hearings, trial, and sentencing. The Supreme Court extended this in Gideon v. Wainwright (1963) to require states to provide an attorney to defendants who cannot afford one in felony cases. Before formal charges, the Fifth Amendment right to counsel during custodial interrogation applies (established in Miranda v. Arizona). Once you clearly invoke your right to an attorney during questioning, all interrogation must stop until an attorney is present.