Microsoft gave thousands of its developers access to Claude Code in December 2025 as a benchmark experiment. The goal was to run it alongside GitHub Copilot CLI, see which one engineers actually preferred, and use that data to improve Copilot. The problem: developers liked Claude Code too much. Now Microsoft's Experiences + Devices team is pulling the plug on Claude Code licenses by June 30, 2026, the last day of Microsoft's fiscal year, and pushing everyone back onto Copilot CLI.
Why Microsoft Tried Claude Code at All
Before Claude Code entered the picture, GitHub Copilot had reached 91 percent adoption across Microsoft's engineering teams. That's a remarkable internal rollout number, but it also gave Microsoft a real baseline for comparison. When Anthropic's agentic coding tool started getting traction, the company decided to run a real-world trial rather than guess at the capability gap.
The trial had a broader mandate than just engineers. Microsoft also encouraged non-coding employees, including designers and project managers, to experiment with Claude Code as a way to prototype ideas without writing code themselves. It was a genuine test of whether the tool could expand who does software work inside the company.
"When we began offering both Copilot CLI and Claude Code, our goal was to learn quickly, benchmark the tools in real engineering workflows, and understand what best supported our teams. Claude Code was an important part of that learning."
The Problem: Developers Actually Preferred It
Six months in, Claude Code had proved popular enough to dent GitHub Copilot adoption numbers internally. That's the uncomfortable subtext in The Verge's reporting: Microsoft ran a competitive benchmark inside its own walls, and the third-party tool won. The Copilot team has been shipping improvements based on Microsoft feedback, but acknowledged gaps between the two tools still exist.
The situation is awkward enough that Microsoft had reportedly explored acquiring Cursor to help close the gap, though those discussions don't appear to have led anywhere. That an acquisition was even considered signals how seriously Microsoft takes the feature distance between its own product and what developers actually want to use.
The Financial Angle
Capability gaps aside, the timing of the cancellation is telling. June 30 is the last day of Microsoft's fiscal year, and pulling Claude Code licenses before that date is a straightforward way to reduce operating expenses heading into the new year. According to The Verge's reporting, the decision is partly financial, not purely a product strategy call.
This reframes the narrative. Microsoft isn't canceling Claude Code because it determined Copilot CLI is better. It's canceling it because the experiment produced an inconvenient result, and the license cost is a clean line item to cut before fiscal year close.
GitHub Copilot CLI as the Replacement
Microsoft is positioning gh copilot as the direct replacement for Claude Code workflows. The tool operates outside of IDEs like Visual Studio Code as a command-line agentic assistant, paralleling what Claude Code offers. Crucially, Copilot CLI can still access Anthropic's models alongside OpenAI's models and Microsoft's internal ones, so this isn't a hard pivot away from Claude's underlying capabilities.
Still, the migration won't be frictionless. Developers who built workflows around Claude Code are being asked to switch to a tool that still has acknowledged gaps. The plan is to keep investing in Copilot CLI integration with Microsoft's internal engineering workflows, security requirements, and repositories. Whether that investment closes the gap fast enough to satisfy developers who've spent six months on Claude Code is an open question.
"We are partnering closely with GitHub and continue to improve Copilot CLI for Microsoft engineers. The GitHub team has already shipped significant improvements based on Microsoft feedback."
What This Means for the Microsoft-Anthropic Relationship
Despite the internal cancellation, the Microsoft-Anthropic partnership isn't collapsing. Microsoft has a deal with Anthropic giving Microsoft Foundry customers access to Anthropic's Claude models via Azure. That deal is unaffected by the Claude Code cancellation. Anthropic's models still power features inside Microsoft 365 apps and Copilot, and Microsoft reportedly became one of Anthropic's top customers earlier in 2026.
The relationship is better described as complicated than broken. Microsoft wants Anthropic's models available to its customers and embedded in its products. It just doesn't want a competing agentic coding tool cannibalizing internal Copilot adoption numbers while GitHub is trying to close the feature gap.
Bottom Line
If you're a Microsoft developer currently on Claude Code, the deadline is June 30. Start mapping your workflows to Copilot CLI now, because the transition will take time regardless of the feature gaps. For everyone watching from outside: this is what happens when a company runs an honest internal benchmark and doesn't like the result. The tool that wins on capability doesn't always win on budget cycles and internal politics.