Microsoft’s latest financial report for its fiscal Q4 2026 has unveiled a fascinating divergence in the performance of its high-stakes artificial intelligence investments. While the tech giant celebrated a substantial $3.2 billion gain from its stake in AI powerhouse Anthropic, its investment in OpenAI presented a more complex picture, experiencing a quarterly markdown of $600 million.
Anthropic: A $3.2 Billion Quarterly Triumph
The standout performer of the quarter was undoubtedly Anthropic. Microsoft recorded an impressive $3.2 billion gain from its investment in the AI lab, a figure that significantly boosted its diluted earnings per share (EPS) by 33 cents. This surge comes less than a year after Microsoft’s strategic $5 billion investment in Anthropic in November 2025. This investment was part of a broader, symbiotic arrangement, with Anthropic committing to purchase a staggering $30 billion worth of Azure cloud services from Microsoft.
Unlike its quarterly updates on OpenAI, Microsoft does not regularly disclose the fluctuating value of its Anthropic holdings. However, this quarter’s disclosure underscores the substantial, albeit infrequent, impact of this particular AI partnership on Microsoft’s bottom line.
OpenAI: A Quarterly Correction, But Long-Term Growth
In contrast to Anthropic’s meteoric rise, Microsoft’s investment in OpenAI, where it holds approximately 27%, saw a quarterly adjustment. The company reported a $600 million markdown, translating to a reduction of about 7 cents in diluted EPS. While such a figure might raise eyebrows, for a company of Microsoft’s scale, which reported a colossal $90 billion in revenue and $35.8 billion in net income for the quarter, this write-down was largely a “rounding error.”
It’s crucial to view the OpenAI investment through a broader lens. On a full-year basis for fiscal 2026, Microsoft’s stake in OpenAI actually generated a robust $5 billion gain, contributing $0.67 to its annual EPS. This annual performance highlights the long-term strategic value and overall positive trajectory of the OpenAI partnership, despite the recent quarterly dip.
The Bigger Picture: Microsoft’s AI Strategy Unfolds
Microsoft’s fiscal 2026 was exceptionally strong, with annual revenues reaching $331.8 billion and net income hitting $133.7 billion. The contrasting quarterly fortunes of its Anthropic and OpenAI investments offer a rare glimpse into the dynamic and often volatile world of cutting-edge AI development and investment.
Perhaps the most striking revelation from the earnings report is the fact that Anthropic’s single-quarter gain nearly matched OpenAI’s entire gain for the fiscal year. Microsoft explicitly highlighted this comparison, signaling its significance in the ongoing AI arms race. As Microsoft continues to deepen its ties with both leading AI innovators, these investment updates provide valuable insights into the evolving landscape of artificial intelligence and its profound impact on the tech giant’s financial health.
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