OpenAI on Google Cloud, October 2026: Microsoft Exclusivity Ends as $20 Billion Revenue Gap Tests the Buildout

OpenAI's GPT-6 Astra and GPT-6.1 Sol are now live on Google Cloud's Model Garden, ending an exclusive arrangement with Microsoft, as the company's annualized revenue run rate of approximately $50 billion falls roughly $20 billion short of earlier estimates and a $30 billion capital raise gets under way.

OpenAI's decision to make its models available on Google Cloud — with GPT-6 Astra and GPT-6.1 Sol now listed in the platform's Model Garden alongside Gemini and Anthropic's Claude — marks a structural shift in how frontier AI is distributed. Reported in October 2026, the move ends what had been described as an exclusive supply arrangement with Microsoft, completing what multiple outlets characterize as OpenAI's presence across all three of the major cloud platforms. Google Cloud is now, according to these reports, the only hyperscaler simultaneously hosting models from all three leading frontier labs. That is a notable commercial achievement for Google's cloud business, but the more consequential reading for OpenAI is strategic: the company is diversifying its distribution footprint, reducing its dependence on any single platform, and — at a moment when it is actively seeking $30 billion in fresh capital — broadening its commercial reach across the full addressable cloud market.

The revenue picture makes that capital-raising context essential. Reports emerging in October 2026 place OpenAI's annualized revenue run rate at approximately $50 billion — substantial, but roughly $20 billion below estimates that had circulated based on a different accounting methodology, as TheStreet and others have noted. The gap proved consequential for AI-adjacent equities: a sell-off reported on October 8 saw Nvidia fall nearly 3%, AMD shed more than 6%, and CoreWeave decline approximately 7.77% to $81.58 in a single session. Broadcom fell 4.35% to $360.14 in a related move, though FinanceFeeds questioned in its reporting whether that decline reflected OpenAI-specific concerns, Anthropic-related factors, or both — no single source provides a definitive explanation for the Broadcom drop. OpenAI is reportedly seeking the $30 billion in part to front-run a potential Anthropic IPO, according to Yahoo Finance, and the gap between revenue expectations and reported figures will likely shape both the terms and the timeline of that raise.

Infrastructure ambitions remain large even as the financial optics shift. Nvidia has confirmed backing approximately $105 billion in financing for OpenAI's Ohio data-center campus, with SoftBank's SB Energy reportedly involved in an effort whose total scale could exceed $500 billion. Broadcom is separately reported to be arranging more than $50 billion in private credit to fund custom AI silicon for OpenAI, and projects — driven in part by OpenAI and Anthropic as clients — AI revenue of $230 billion by 2028, though one analyst noted some risks remain unresolved. The $500 billion Stargate initiative is, however, reportedly encountering power-supply difficulties. OpenAI's data-center leadership has changed again in the same period: Sachin Katti, who oversaw compute and Stargate, departed, citing plans to launch a new venture, and former xAI executive Uday Ruddarraju — who joined OpenAI in July 2025 and had been serving as compute CTO — was named the new head of infrastructure and computing operations. Two additional hires signal where execution priorities lie: Allyson Fealtman, formerly in strategic data-center sourcing at Google, joined to focus on high-speed interconnects and rack power, while Wilson Vu, previously a senior director of AI systems hardware architecture at Microsoft, crossed over to work on compute architecture.

The competitive environment surrounding OpenAI continues to evolve in ways that complicate the growth narrative. DeepSeek's open-sourcing of its DeepInfer inference engine — built on vLLM and designed to reduce the cost and energy consumption of running large models — is noted by Crypto Briefing as applying direct cost pressure on both OpenAI and Anthropic. Cerebras has seen its stock fall more than 50% from its all-time high, with TradingKey attributing that decline partly to OpenAI's pivot toward Nvidia hardware. On the safety and governance front, AI safety advocates cited by The Information are calling for compute caps on internal R&D at frontier labs, while Sam Altman is reportedly circulating three endgame scenarios for AI safety within OpenAI — ranging from an IAEA-style international oversight body to a scenario in which one firm renders all others' compute capacity obsolete. These are internal deliberations reported by a single outlet and should be read with appropriate caution, but they illustrate that governance frameworks are now formally part of the strategic conversation at the frontier labs.

Viewed in aggregate, October 2026 finds OpenAI navigating a combination of genuine commercial scale and structural uncertainty. The multi-cloud expansion to Google Cloud is a rational distribution move that widens the addressable market and reduces platform concentration risk; the end of the Microsoft exclusivity arrangement is a meaningful renegotiation of a relationship that has defined OpenAI's commercial architecture for several years. A $50 billion annualized revenue run rate is, on any measure, a business of real size, even if it falls below the highest earlier estimates. Michael Burry, cited by Stocktwits, has argued that OpenAI and Anthropic are positioning for oligopoly status in AI, while warning that much of the current AI capital spending risks becoming sunk cost — a perspective the revenue-gap reports will reinforce for near-term investors. Three signals are worth watching closely: whether the $30 billion capital raise closes on favorable terms before an Anthropic IPO reshapes private-market pricing; whether the Stargate buildout's reported power-supply challenges are resolved quickly enough to keep the Ohio campus on schedule under Ruddarraju's stewardship; and whether OpenAI's revenue trajectory in subsequent quarters converges toward the higher estimates — or confirms the lower run rate and tests the assumptions underpinning Broadcom's $230 billion AI-revenue projection for 2028.