OpenAI unveils AgentKit, Apps SDK, and new ChatGPT at DevDay 2025
At DevDay 2025 OpenAI dropped a handful of tools that seem aimed straight at developers. The big names were AgentKit, an Apps SDK and a refreshed ChatGPT. AgentKit is pitched as a way to build and ship AI agents, while the Apps SDK looks like a shortcut for plugging those agents into custom apps.
The twist is that OpenAI also tried to re-brand ChatGPT, not just a chatbot, but an app platform they called an “agent OS.” Alongside the SDKs they hinted at “more powerful models in its API,” which feels like a move to keep the whole loop in-house. Details on the model specs or pricing, however, were pretty thin. What I’m taking away is that OpenAI wants to push a developer-first stack where agents, apps and the underlying models live together.
It’s unclear whether developers will bite, but the announcements do point toward a tighter, more integrated AI development workflow.
Everything OpenAI announced at DevDay 2025: AgentKit, Apps SDK, ChatGPT, and more Related: OpenAI launches AgentKit to help developers build and ship AI agents OpenAI ramps up developer push with more powerful models in its API OpenAI’s DevDay 2025 reframed ChatGPT as an app platform and agent OS, debuting Apps inside ChatGPT, a preview Apps SDK, and AgentKit. Apps run directly in ChatGPT responses with interactive UIs, video, login, and actions via the Model Context Protocol (MCP). Launch partners include Canva, Zillow, Coursera, Figma, Spotify, Booking.com, and Expedia, with DoorDash, Instacart, Uber, and AllTrails “coming soon.” Live demos showcased end-to-end “talking to apps”: generating a poster in Canva, auto-building a pitch deck, and pulling Zillow listings with natural-language filters and maps, including full‑screen renders inside ChatGPT. Other announcements in dev day included: AgentKit rolled out alongside Agent Builder (a visual “Canva for agents”), ChatKit (an embeddable chat UI), Evals for Agents (step-trace grading, datasets, automated prompt optimization, external-model evals), and a Connectors registry with admin controls.
Developers are probably going to test AgentKit and the fresh Apps SDK in different ways. At DevDay 2025 OpenAI framed ChatGPT as both an app hub and an agent-style system, hinting that more tools might be coming for creators. They also revealed a tie-up with Broadcom to build custom AI chips - a move that could shake up hardware supply chains, although it’s still fuzzy how much speed or price will change.
AgentKit is marketed as a shortcut for building and shipping AI agents, yet the docs on how to stitch it into existing stacks are thin. The API now exposes stronger models, which might lure current users, but smaller teams could worry about higher bills. OpenAI clearly wants a developer-first vibe, but whether the chip partnership plus the new software will deliver noticeable benefits to end users remains uncertain.
As the dust settles, we’ll be looking for real-world demos and benchmark numbers before deciding what sticks.
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Common Questions Answered
What is AgentKit designed to help developers accomplish?
AgentKit is specifically billed as a tool to help developers build and ship AI agents more quickly. It provides a framework to streamline the creation and deployment process for these advanced AI systems.
How does the new Apps SDK change the way AI agents are integrated?
The Apps SDK offers a more direct path for developers to embed AI agents into their own custom applications. This simplifies integration compared to previous methods, allowing for a more seamless implementation.
In what way was ChatGPT reframed at DevDay 2025?
OpenAI reframed ChatGPT not just as a chatbot but as an app platform and an 'agent OS'. This new positioning means ChatGPT can host apps with interactive UIs and serve as an operating system for various AI agents.
What partnership did OpenAI announce related to hardware at DevDay 2025?
OpenAI announced a partnership with Broadcom to design its own custom AI chips. This effort aims to influence hardware supply chains, though the specific impact on performance and pricing is still unclear.