OpenAI launched App SDK, which connects applications directly to ChatGPT, AgentKit to speed up AI agent development, ChatKit to bring OpenAI to apps and websites, the general availability of Codex, and said ChatGPT-5 Pro and a smaller voice model is available in the API.
The company also said that it has 800 million weekly users, 4 million developers and 8 billion tokens processed per minute on OpenAI's API.
Speaking at OpenAI's Dev Day, CEO Sam Altman outlined the company's latest developer releases and placed the company in the middle of the software ecosystem. Demos highlighted integrations with Canva, Figma, Coursera and callouts for enterprise software vendors like HubSpot. The HubSpot mention eased concerns about OpenAI targeting SaaS directly.
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Altman's keynote revolved around creating applications without code, enabling voice interfaces and using ChatGPT as an interface to third-party software vendors. Altman addressed developers directly:
"We're going to show you how we're making it possible to build apps inside of ChatGPT and how we can help you get a lot of distribution. We're going to show you how building agents is going to be much faster and better. You'll see how we're making it easier to write software. We think this is the best time in history to be a builder. It has never been faster to go from idea to product."
Key points from OpenAI's Dev Day announcements:
- Apps SDK is in preview and Model Context Protocol (MCP) is the connective tissue between ChatGPT and applications. "With the Apps SDK, you get the full stack. You can connect your data trigger actions, render a fully interactive UI and more," said Altman. "You get full control over your back end logic and front end UI. We've published the standard so that anyone can integrate the Apps SDK. Your apps can reach hundreds of millions of ChatGPT users."
- OpenAI will highlight partner apps built via Apps SDK. "We'll also release a directory that users can browse in addition to discovery and conversation," said Altman. For now, the launch applications for the Apps SDK are decidedly consumer.
- The company is looking to make it easier to create AI agents. "It's hard to know where to start, what frameworks to use, and there's a lot of work. There's orchestration, eval loops, connecting tools, building a good UI, and each of these layers adds a lot of complexity before you know what's really going to work," said Altman.
- Agent Kit will offer a set of building blocks to build, deploy and optimize agentic workflows. OpenAI said it is targeting individual developers as well as enterprise. Altman highlighted Agent Builder, a canvas to build agents, design logic steps and test workflows. Agent Builder is built on top of OpenAI's Responses API. Chat Kit will bring an embeddable ChatGPT interface. Agent Kit will also include OpenAI Connector Registry, which will provide trusted access to data and agents. There's also a control panel for administrators.
- "Almost all new code written at OpenAI today is written by Codex users," said Altman. He said more features will be announced shortly and cited a big Codex deployment at Cisco.
- ChatGPT-5 Pro will address use cases in industries such as finance, legal and healthcare. The smaller voice model is designed to address voice applications at a lower cost.
