Microsoft's OpenAI Dependency Deepens With Copilot GPT-5.6
Microsoft's OpenAI dependency now shows up in two places at once: in the default model inside GitHub Copilot and in the revenue line of its latest filing. CNBC reported that Microsoft's guidance sets OpenAI's GPT-5.6 Sol as the default model in GitHub Copilot. Bloomberg reported that Microsoft's sales tied to OpenAI reached $24.1 billion in the fiscal year ended June 2026. The two reports frame the same relationship from different ends: what developers run and where the AI revenue comes from.
Jay Parikh, who leads Microsoft's CoreAI engineering group, issued the guidance this week, according to CNBC. Slashdot's account of the memo said Microsoft chose GPT-5.6 because it is cheaper to use than other models. That makes the move an efficiency play: Copilot keeps a top-tier model as its default while lowering the cost per request.
Why the OpenAI dependency is hard to unwind
The revenue numbers sharpen the stakes. Bloomberg reported, citing a company filing from last week, that Microsoft's sales tied to OpenAI reached $24.1 billion in the fiscal year ended June 2026. CEO Satya Nadella said at the end of the March quarter that Microsoft was on pace for about $37 billion in annual AI revenue, Bloomberg reported. The OpenAI figure is roughly two-thirds of that pace.
That concentration is what makes the relationship hard to unwind. The Copilot default could be changed later. The revenue line is the harder constraint, because it ties Microsoft's reported AI revenue to one supplier's models.
Why this matters
For teams that standardize on GitHub Copilot, the practical signal is that OpenAI is now part of both the product story and the financial story. The dependency is priced into the default model and the revenue line. Any change to that relationship would affect both.
Photo by Brecht Corbeel on Unsplash
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