WASHINGTON — A detainee at Guantánamo Bay has agreed to a deal intended to lead to his release in the next few years in return for giving up the right to question the C.I.A. in court about its torture program, United States government officials said.

The deal, negotiated by the Pentagon official who oversees the military commissions that serve as a court for some detainees, was reached in recent weeks, and comes as a number of those who have been charged at Guantánamo are seeking to cite their abuse at the hands of the C.I.A. as part of their defense.

Under the deal, the prisoner, Majid Khan, 41, who has pleaded guilty to serving as a courier for Al Qaeda, would complete his prison sentence as early as next year and no later than 2025 and then could be released to another country, assuming one will take him, according to people who have seen the terms or are familiar with its details.

In exchange, Mr. Khan will not use his sentencing proceedings to invoke a landmark war court decision that allowed him to call witnesses from the C.I.A.’s secret prison network to testify about his torture.

2014 Senate investigation. He was also sleep deprived, kept naked and hung by his wrists, and hooded, to the point of hallucinations.

Mr. Khan was transferred to Guantánamo Bay in 2006 and saw a lawyer for the first time in his fourth year of detention. In 2012, he pleaded guilty to terrorism-related charges stemming from his work for Al Qaeda after the Sept. 11 attacks, and agreed to postpone his sentencing while he cooperated with government prosecutors.

On April 16, he and his lawyers reached agreement with the overseer of military commissions for a sentence that would end sometime between early next year and March 1, 2025.

The agreement itself is under seal, at least until a judge questions Mr. Khan on whether he voluntarily entered into it. But several people, speaking on the condition of anonymity to describe details of the deal, said that it has a sentencing range of 11 to 14 years, applied starting with his guilty plea in 2012.

prosecutors failed to disclose certain evidence. Colonel Watkins retires from the Army on Aug. 1 and was replaced on the case Wednesday by an Air Force judge, Col. Mark W. Milam.

The agreement is the first involving a Guantánamo detainee that the Biden administration has reached since taking office. It was made by Jeffrey D. Wood, a National Guard colonel who was appointed by the Trump administration to the civilian role of convening authority for military commissions.

had actually seen Mr. Khan in C.I.A. detention.

The issue had been simmering but had not come to a head because travel restrictions during the coronavirus pandemic brought most military commission hearings to a standstill for the last year.

The question of whether Mr. Khan could receive a reduction in his sentence because of his torture was also a potential model for the defense in the capital conspiracy case against Khalid Shaikh Mohammed and four other men accused of plotting the Sept. 11 attacks. Defense lawyers for all five defendants say there is evidence that each was systematically tortured in the black sites, and they want a judge or jury to hear graphic details about it to avert a death sentence when the long-delayed case eventually proceeds.

Two contract psychologists who devised the C.I.A.’s interrogation program, James Mitchell and John Bruce Jessen, have been publicly identified. But the identities of the people who interrogated Mr. Khan, and in which countries where they did it, are still classified at the court, which operates under rules that the government says are intended to balance state secrets and fair trial rights.

Prosecutors argued that anonymous, in-person testimony about Mr. Khan’s treatment, whether in a classified session or in public, risked exposing covert U.S. government employees, and said it was not possible to take them to Guantánamo Bay. That left the possibility of the judge ordering their appearances, prosecutors refusing to bring them and as a remedy, the judge reducing Mr. Khan’s sentence.