After telling employees to stop using Claude Code, Microsoft’s internal memo has more ‘bad news’ for Anthropic

After telling employees to stop using Claude Code, Microsoft’s internal memo has more ‘bad news’ for Anthropic

By TOI Tech Desk
Publication Date: 2026-08-06 03:36:00

Microsoft’s new internal memo makes OpenAI’s GPT-5.6 the default model for its engineers, replacing a setup that had been quietly routing GitHub Copilot work to Anthropic’s Claude.

Microsoft spent May telling its Windows, Office and Surface engineers to wind down Claude Code and move to GitHub Copilot CLI before the fiscal year closed on June 30. That looked like a licensing decision, and an expensive one for Anthropic. This week’s internal memo suggests the harder blow was still coming.Jay Parikh, the executive vice president who runs Microsoft’s CoreAI organisation, wrote to his teams that “tokenmaxxing is not what we are optimizing for,” asked engineers to review their own AI spending, and made OpenAI’s GPT-5.6 the default model for internal use. 404 Media first reported the memo, which lands at a company that has just posted another record quarter and is still worried enough about its own AI bill to put a ceiling on it.

GitHub Copilot’s auto-router was quietly sending Microsoft…