Microsoft's $3.2B Anthropic Gain vs OpenAI Loss in Q4 2026

Microsoft's Q4 Fiscal 2026 Earnings: AI Investments Under the Microscope

Microsoft's fiscal 2026 fourth-quarter earnings (ending June 30) revealed surprising contrasts in the performance of its major AI investments. The company recorded a $3.2 billion gain from its Anthropic investment, while marking down its OpenAI stake by $600 million. Here's a detailed breakdown of how these competing AI bets affected Microsoft's bottom line.

Anthropic Investment Yields $3.2 Billion Gain

Microsoft invested $5 billion in Anthropic in November 2025 as part of a circular agreement where the AI lab committed to purchase $30 billion worth of Azure services. In Q4 2026, this investment contributed 33 cents per diluted share to earnings, boosting diluted EPS to $4.81.

Key Financial Impact

• Quarterly gain from Anthropic: $3.2 billion
• EPS contribution: +$0.33
• Initial investment: $5 billion
• Azure revenue commitment: $30 billion

OpenAI Investment Faces $600 Million Write-Down

Microsoft owns approximately 27% of OpenAI and accounts for the investment's value quarterly. The Q4 markdown reduced diluted EPS by about 7 cents per share. However, this write-down was largely a rounding error given Microsoft's massive quarterly revenue of $90 billion and net income of $35.8 billion.

Full-Year Context Shows $5B Gain

Despite the quarterly decline, Microsoft's OpenAI investment performed well on a full-year basis, generating a $5 billion gain and adding $0.67 to EPS for fiscal 2026 (total EPS: $17.95). This underscores the volatility and long-term potential of AI investments.

Comparing Microsoft's AI Bet: Anthropic vs OpenAI

The most striking takeaway is that Microsoft recorded nearly as much gain from Anthropic in a single quarter as it earned from OpenAI over an entire year. The $3.2 billion quarterly Anthropic gain versus the $5 billion annual OpenAI gain highlights the rapidly shifting dynamics in the AI investment landscape. Microsoft notably disclosed this comparison, signaling its strategic transparency.

What This Means for Microsoft's AI Strategy

Microsoft is increasingly competing with both Anthropic and OpenAI in the AI space. The circular agreement model—where AI labs buy Azure services in exchange for investment—ties AI growth directly to Microsoft's cloud business. This dual investment strategy allows Microsoft to hedge bets while driving Azure adoption.

The Circular Agreement Model

Microsoft's investment in Anthropic included a commitment from the AI lab to purchase $30 billion in Azure services over time. Similarly, OpenAI uses Azure extensively. This creates a symbiotic relationship: Microsoft gains cloud revenue while supporting the development of cutting-edge AI models.

Microsoft's Overall Financial Strength

For fiscal Q4 2026, Microsoft reported $90 billion in revenue and $35.8 billion net income. Full-year figures were $331.8 billion revenue and $133.7 billion net income. These numbers demonstrate Microsoft's capacity to absorb even sizable investment fluctuations, while AI remains a key growth driver.