Amid a global AI wave, OpenAI held its annual developer conference, DevDay 2025, in San Francisco on October 6, where CEO Sam Altman appeared in person to unveil a string of disruptive product updates. The event not only showcased the company’s latest advances in generative AI but also unexpectedly became a “stock engine” for Wall Street—companies mentioned during the conference, including Figma, Uber, HubSpot and AMD, saw sharp share moves, producing market‑cap impacts worth many billions. Dubbed the "Olympics of AI development," DevDay 2025 drew tens of thousands of developers online and marked OpenAI’s conspicuous pivot from a tools provider toward an ecosystem builder.
In his opening keynote, Altman argued that "we stand at the threshold of a new era of AI operating systems." He announced OpenAI’s effort to position ChatGPT as "the operating system of the future" by launching the Apps SDK, which allows developers to embed third‑party apps directly into the ChatGPT interface for seamless interaction. For example, users could call Expedia’s trip‑planning app or book rides via Uber inside ChatGPT without switching interfaces. The capability relies on the Agentic Builder framework, supporting multi‑agent collaboration and allowing AI "agents" to autonomously handle complex tasks such as itinerary optimization or code debugging. TechCrunch reported that the SDK will lower development barriers and is expected to attract millions of app integrations within the year.
Another major reveal was the formal launch of AgentKit, a toolkit designed to build "intelligent agents" that make autonomous decisions and handle tasks from data analysis to real‑time decision‑making. In a demo, Altman showed an agent integrating with HubSpot’s CRM to automatically generate sales reports and predict customer behavior, delivering a threefold efficiency improvement. WIRED commented that this represents a leap from AI as a "passive assistant" to an "active operating system," and suggested ChatGPT could become the platform of choice for many developers.
Video generation also received a significant upgrade: the public beta of Sora 2 was unveiled, supporting 1080p output, up to 60‑second clips, and first‑time audio synchronization. Compared with its predecessor, Sora 2 adds a physics simulation engine that more realistically reproduces lighting, gravity and object interactions, suitable for film previsualization and advertising production. Altman also disclosed a collaboration with former Apple design chief Jony Ive on a consumer AI hardware project expected in 2026 that will reportedly use the Sora 2 core engine. Additionally, ChatGPT gained a Slack integration enabling enterprise users to invoke AI‑generated meeting summaries and brainstorming ideas directly within collaboration tools, further deepening B2B use cases.
These releases came with practical commitments. OpenAI said parts of the Apps SDK and AgentKit will be open‑sourced and that developers can test via a free API Studio. The conference also announced updates to ChatGPT Enterprise, including stronger privacy controls and a custom agent builder targeted at Fortune 500 needs. CNBC’s live coverage recorded sustained applause during demos, and developer feedback called the event "a turning point for AI development." ZDNet analyzed that DevDay emphasizes an "ecosystem closed loop," optimizing the full chain from model training to app deployment, and estimated the moves could help push OpenAI’s annual revenue past $15 billion.
The most immediate surprise, however, came from Wall Street. When Altman casually mentioned partners such as Figma, Expedia, Uber, Coursera and AMD, market enthusiasm surged. Yahoo Finance data showed Figma’s shares jumped about 7%, adding roughly $5 billion in market value at open; Expedia rose about 2% on travel‑AI integration expectations; Uber climbed about 4.5% as shared‑mobility agent features were highlighted. HubSpot’s stock also jumped nearly 7% with trading volume tripling. The most dramatic move was AMD: Altman said OpenAI will procure AMD GPUs to support Sora 2 training, and AMD’s shares surged 34% that day, adding about $70 billion in market value. AInvest reported that in the prior week Shopify and Etsy had already risen about 10% cumulatively after mentions of ChatGPT’s “instant buy” capabilities.
This phenomenon is not unprecedented. Bloomberg noted that although OpenAI is a private company, it has become an "invisible whale" whose announcements can move markets. Last month, OpenAI’s $30 billion cloud agreement with Oracle helped push Oracle shares to a 36‑year high; Nvidia’s $100 billion investment commitment tied to AI also helped keep its market cap above $3 trillion. TipRanks observed that OpenAI’s market influence rivals that of Apple and Nvidia: despite being private, its ecosystem mentions can indirectly sway stock prices. Moomoo’s analysis showed OpenAI recorded $4.3 billion in revenue in the first half of 2025 but a $2.5 billion loss, and argued that the strategy of "spending for influence" is amplifying market volatility.
From a broader perspective, DevDay’s market effects reflect deep integration within the AI ecosystem. Investopedia reported that the Nasdaq and S&P 500 closed up about 0.5% that day, and AI infrastructure names such as Monolithic Power Systems benefited from the AMD‑OpenAI link, rising more than 5%. GuruFocus emphasized that OpenAI’s "mention effect" has become routine: cloud providers, chipmakers and app developers across the chain gain from AI momentum. A Medium commentary warned that such "speech‑driven" market expansions could heighten bubble risk, even as they spur short‑term innovation investment.
The ripples from DevDay 2025 continue to unfold. Futunn reported that OpenAI’s moves triggered supply‑chain reactions reminiscent of Apple product launches, and Nvidia and AMD shares have risen about 20% cumulatively. As a leading AI player, OpenAI is stepping into the spotlight: DevDay not only delivered technical advances but also reshaped capital markets. On the OpenAI developer forum, users debated that "this is not just an update, it’s a blueprint for AI’s future." Looking to 2026, with the Jony Ive hardware project progressing, OpenAI could further expand its influence and help move AI from the cloud into handheld devices. Behind the celebration, however, regulators and investors are warned to monitor valuation bubbles and ensure sustainable growth.