Editorial illustration for OpenAI's ChatGPT Now Offers 'Sign In' Access to 16 Partner Services
ChatGPT Opens Plugin System to 16 Partner Services
OpenAI's ChatGPT Now Offers 'Sign In' Access to 16 Partner Services
OpenAI used its DevDay stage to announce that ChatGPT is shedding its single-window chatbot format. The company is opening up the plugin system it built for its own use, letting outside developers plug directly into the assistant with tools like Plugin Extensions and a new "Plugin Creator" meant to simplify submissions. Alongside that, OpenAI is rolling out workplace features: a shared workspace called ChatGPT Space, collaborative documents named Pages, and a slide deck tool, plus the ability to trigger automated workflows through the MCP Events specification and Team Tasks.
The assistant is also showing up where people already work. ChatGPT now responds to @mentions inside Slack and Microsoft Teams, folding itself into existing office chat rather than asking users to switch apps. On the business side, OpenAI is introducing a Pro 500 plan for heavy users and enterprise customers, a "Sign in with ChatGPT" option for managing quota-based access across a slate of third-party tools, and a marketplace stocked with dozens of partners.
The combined effect points OpenAI toward direct competition with Slack, Notion and Google Workspace, and potentially Microsoft's office software further down the line.
OpenAI is handing outside developers the same tools it has been using internally to build ChatGPT features. The company also added shared workspaces, automated workflows, and a marketplace for enterprise customers. Taken together, the announcements push ChatGPT well beyond its chatbot roots and put OpenAI on a collision course with at least Slack, Notion, and Google Workspace and ultimately even Microsoft Office or Windows.
Why this matters
For developers and founders, "Sign in with ChatGPT" is OpenAI making a play for the login button, not just the chat window. If your product sits in that list of 16, you're getting distribution inside an assistant with hundreds of millions of users. If you're not, you're watching a competitor's tool become the default way people reach Notion, Vercel, or Devin. That's a real strategic fork: build for the platform or build against it.
We'd also flag the quota mechanics. Usage against partner services counts against Plus and Pro limits, which means OpenAI controls the meter on how much of your product gets used through this channel. That's worth watching closely if your business model depends on usage-based pricing of your own.
Combined with MCP Events and Team Tasks, this isn't a chatbot picking up plugins. It's OpenAI positioning ChatGPT as the identity layer and automation trigger for other people's software. Anyone building AI tools should be asking whether they want to be a partner in that system or a target it eventually competes with directly.
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Common Questions Answered
What is the 'Sign In with ChatGPT' feature and how does it work with partner services?
Sign In with ChatGPT allows users to access 16 partner services directly through ChatGPT, similar to how 'Sign In with Google' or 'Sign In with Facebook' works on other platforms. This integration gives these partner services distribution to ChatGPT's hundreds of millions of users, making it easier for people to access tools like Notion, Vercel, and Devin without leaving the ChatGPT interface.
What new workplace collaboration features did OpenAI introduce at DevDay?
OpenAI announced several enterprise-focused features including ChatGPT Space (a shared workspace), Pages (collaborative documents), and a slide deck tool designed for team collaboration. These additions represent a significant shift from ChatGPT's original single-window chatbot format toward a more comprehensive workspace solution.
How are developers now able to build plugins for ChatGPT?
OpenAI is opening up its internal plugin system to outside developers through Plugin Extensions and a new 'Plugin Creator' tool designed to simplify the submission process. By giving developers the same tools OpenAI uses internally, the company is enabling third-party innovation while expanding ChatGPT's capabilities beyond its original chatbot functionality.
What companies does OpenAI's expansion put it in direct competition with?
According to the announcement, OpenAI is putting itself on a collision course with Slack, Notion, and Google Workspace, and potentially even Microsoft Office or Windows. The new workplace features and plugin ecosystem position ChatGPT as a platform that could replace or integrate with existing productivity and collaboration tools.
What strategic decision do developers face regarding ChatGPT's new platform?
Developers must decide whether to build for the ChatGPT platform to gain access to its massive user base or build against it as a competitor. Being among the 16 partner services provides significant distribution advantages, while not being integrated means watching competitors become the default way users access certain tools.
Further Reading
- DevDay 2026 Recap - OpenAI
- Sign in with ChatGPT - OpenAI Help Center
- OpenAI DevDay 2026: Live updates and announcements - CNBC
- OpenAI's latest features take direct aim at the app store model - Yahoo Finance
- OpenAI's reveals a new ChatGPT that looks less like a chatbot and more like an operating system - The Decoder
