Mr. Díaz declined to comment on the university’s decision. Last month, in a statement provided through his literary agent, Nicole Aragi, Mr. Díaz said he took responsibility for his past behavior. “I am listening to and learning from women’s stories in this essential and overdue cultural movement,” he said. “We must continue to teach all men about consent and boundaries.”

M.I.T.’s conclusion of its internal inquiry comes on the heels of a similar decision by the Boston Review, which recently announced that Mr. Díaz would remain in his position as the magazine’s fiction editor. “During his 15-year tenure as fiction editor, we have never received any complaints about Junot’s conduct, either from our staff or from writers,” editors Deborah Chasman and Joshua Cohen wrote in a letter announcing the outcome.

Their statement prompted an outcry on social media. The board of directors for VIDA, a nonprofit feminist organization that advocates for women in the literary arts, published a letter denouncing the review’s decision, which received hundreds of signatures. The Boston Review’s three poetry editors, Timothy Donnelly, B.K. Fischer and Stefania Heim, quit in protest.

“It was painful to leave but we couldn’t stay where we felt deprived of a vote and a voice, especially on such an important issue,” the editors said in a joint statement to The Times. “We believe that editors can make a significant difference by creating safer and more equitable spaces in the literary world. We think gatekeepers in publishing have a responsibility to their readers and their writers to set a precedent of accountability and real transparency so that women and especially women of color can be heard.”

Of all the messy #MeToo controversies that have upended the publishing industry, including allegations against best-selling authors like Sherman Alexie and James Dashner, the debate about Mr. Díaz has become perhaps the most contentious and divisive within the literary world.

Born in the Dominican Republic and raised in New Jersey, Mr. Díaz has been celebrated as a daring and stylish writer who broke boundaries with his novel “The Brief Wondrous Life of Oscar Wao,” which won the Pulitzer Prize in 2008. He received a MacArthur genius grant in 2012. In January 2017, he was one of five prominent novelists invited to meet with President Barack Obama to discuss literature, politics and media over lunch.

The controversy over his treatment of women erupted this spring, after he published an essay in The New Yorker detailing how he had been raped as a child, in which he described how the ensuing shame and trauma led him to have troubled relationships with women. The essay was widely praised as a brave and honest account of his painful past, but others saw Mr. Díaz’s account as an effort to pre-empt allegations that he had mistreated women.