Leaked documents analyzed by tech blogger Ed Zitron indicate that OpenAI is facing financial challenges despite increasing revenue. The documents reveal that OpenAI's payments to Microsoft, which totaled $493.8 million in 2024 and $865.8 million in the first three quarters of 2025, are part of a deal where Microsoft invested over $13 billion in the AI startup. OpenAI reportedly spends 20% of its revenue on these payments. The data also shows that OpenAI's inference costs were approximately $3.8 billion in 2024, escalating to $8.65 billion in the first nine months of 2025. These figures suggest that OpenAI's expenditure on processing user queries may exceed its earnings, raising concerns about the sustainability of its financial model and contributing to discussions about a potential AI sector bubble.