THE ESSENTIALS IN 30 SECONDS

  • In a November 6 blog post, John Langford wrote that AI Frontiers, a Microsoft Research group of about 50 people formed in 2023, is over.
  • Microsoft's own lab page says AI Frontiers became part of Microsoft AI on September 14, 2026; Langford calls the move non-consensual.
  • Langford says he has left Microsoft after disagreeing with Microsoft AI's scaling-focused leadership; no Microsoft statement has been reported.

John Langford, a long-serving Microsoft Research scientist based in New York and co-creator of the Vowpal Wabbit machine learning library, has left Microsoft. In a post dated November 6 on his blog, Machine Learning (Theory), he wrote that "AI Frontiers is over," referring to the research group he helped found.

What happened to the group

AI Frontiers was set up inside Microsoft Research in 2023, after the release of ChatGPT, to run more coordinated AI research. Langford puts its size at about 50 people. Microsoft's lab page lists Ece Kamar as its lab director and carries an update dated September 14, 2026, saying the group is now part of Microsoft AI. Langford describes that reorganization as non-consensual and says the group will host no interns next year.

He lists the work he considers the group's legacy: the AutoGen framework for orchestrating multiple agents, the Fara computer-use agent, and, from the New York team, research on new training objectives, an optimizer derived from Muon and a transformer variant that uses recursion. He also points to a code repository shared by default across Microsoft Research, which included a pretraining codebase.

Why Langford left

Langford says he disagreed with Microsoft AI's leadership, whose approach he characterizes as centered on scaling rather than research, and that he saw clear signs the team was not wanted there. He writes that he found places for his team members as best he could before leaving, and that the other founding leaders of AI Frontiers reached similar conclusions. He also explains why he did not return to Microsoft Research: he doubts research there still has a route into real products. He does not say where he is going next.

What is not known

No comment from Microsoft has been reported. The NewsBytes article of November 7 and a HyperAI write-up carried no company statement, and no independent reporting from larger outlets could be found at the time of writing. The account of the group's end therefore rests largely on Langford's post. It is unclear how many of the roughly 50 researchers remain at Microsoft, what happens to the projects he lists, or whether the lab page, which still presents AI Frontiers as an active unit under Kamar, will change.