AI Issues: OpenAI Dev Day 2025
OpenAI is transforming ChatGPT into a full platform by launching in-chat apps, a production agent stack, Codex GA coding copilot powered by GPT-5-Codex, and a more controllable Sora 2.
Image source: ChatGPT-5
Key Highlights: OpenAI Dev Day 2025 Announcements
ChatGPT has become a platform.
OpenAI unveiled ChatGPT Apps -- interactive in-chat applications built using a new App SDK.
It has transformed ChatGPT into a hub where developers can build, deploy, and monetize AI-powered tools.
AgentKit makes agent creation simple.
Developers can now build production-grade AI agents in minutes using AgentKit's visual agent builder, embeddable Chat Kit, and new evaluation tools.
In a live demo, an OpenAI engineer impressively created two agents and added security layers in just 6 minutes.
Codex graduates with GPT-5-Codex.
Now generally available, Codex runs on GPT-5-Codex and assists with code generation, refactoring, and automation.
In the demo, Codex connected a Sony camera to an Xbox controller and then lit up stage lighting on command -- all without manual coding.
Sora 2 API delivers cinematic control.
Sora 2 now combines visuals with synchronized audio, enabling creators to add realistic sound, camera motion, and environmental effects.
OpenAI's demo transformed a puppy photo into a vibrant video scene, showcasing how far generative video has come.
GPT-5 expands the model family.
GPT-5-Codex assists with coding tasks, GPT-5 Pro provides advanced reasoning for industries like finance and healthcare, and GPT Real-Time Mini enables low-latency voice agents at 70% lower cost.
The AI-native economy has begun.
From app monetization to in-chat instant purchases, OpenAI is building infrastructure that lets developers reach global customers through conversation, redefining software as something you talk to rather than type into.
From Chatbot to Platform
OpenAI's 2025 Dev Day was an event celebrating a strategic leap.
It showcased ChatGPT's evolution from a chatbot to a full developer platform.
CEO Sam Altman and his team introduced new SDKs, agent tools, and creative APIs for building with AI, not just using it.
The message was clear: AI is becoming the platform itself, not just a layer on top of software, forming the foundation of a new AI-powered economy where developers can reach hundreds of millions of users through conversation.
ChatGPT Apps: A New Kind of In-Chat Software
OpenAI launched ChatGPT Apps, a new way for developers to build conversational, personalized applications that run directly within ChatGPT.
Using the App SDK (available in preview today), developers can connect data, trigger actions, and design interactive user interfaces that appear naturally within conversations.
This lets users interact with fully-featured tools right alongside their messages.
In a live demo, OpenAI engineers showcased apps from Coursera, Canva, and Zillow that dynamically responded to chat commands.
Coursera streamed educational videos in the chat window while ChatGPT summarized and explained the lecture in real time.
Canva generated a poster for a fictional dog-walking business, then instantly converted it into a full investor presentation deck -- all within the same thread.
Zillow demonstrated a real estate search where a user asked ChatGPT for the best city to expand their business, got 'Pittsburgh' as a recommendation, then saw interactive listings in that area filtered by features like '3 bedrooms, yard for dogs' -- all during the conversation.
OpenAI also unveiled discovery and monetization models for these apps.
Developers will soon be able to submit apps for review, appear in the ChatGPT App Directory, and monetize through in-chat payments powered by the Agentic Commerce Protocol, enabling instant checkout experiences right within ChatGPT.
The App SDK and initial partner apps are currently available in preview, with monetization features launching later this year.
AgentKit: Building Agent Workflows Without Overhead
OpenAI also launched AgentKit, a full-stack toolkit for creating and deploying production-grade AI agents directly within ChatGPT.
The platform combines everything developers need to build context-aware agents, eliminating the heavy orchestration that has historically slowed down AI projects.
AgentKit includes:
Agent Builder - A visual canvas for building agent logic and multi-step workflows.
Chat Kit - An embeddable chat interface that developers can style to match their brand.
Evals for Agents - Tools for tracking scoring, performance testing, and automated prompt optimization.
Connector Registry - A secure way to connect internal tools and APIs under centralized admin control.
In one of the most impressive demos of the day, OpenAI engineer Christina built and deployed two agents with security layers in just 6 minutes, finishing with 2 minutes to spare from her live 8-minute slot.
She used the Agent Builder to wire up a specialist agent to answer Dev Day questions, attach datasets, add PII guardrails for data protection, and push the entire workflow live -- all without writing a single line of code.
The demo highlighted how the Agent Builder enables visual iteration, instant deployment, and secure integration, reducing AI development from months to minutes.
Codex Powered by GPT-5-Codex: General Availability
OpenAI's Codex, the AI assistant for developers, has transitioned from research preview to general availability.
Powered by the new GPT-5-Codex model, the product is designed to act as an AI team member that understands context, writes and reviews code, and can now collaborate with human engineers in real time.
In a live on-stage demo, OpenAI engineer Ramon built a camera control interface with panning, zooming, and lighting adjustments using only Codex commands.
Codex integrated a Sony camera with the full Node.js stack through the 30-year-old VISCA protocol, automatically reasoned through hardware documentation, and even connected an Xbox controller to move the camera -- all without the engineer writing a single line of code.
Then, Ramon connected Codex to the venue's lighting system through an MCP server using OpenAI's new Real-Time API, enabling voice commands like:
"Can you point the lights at the audience?"
Codex literally lit up the crowd on command.
Codex is now available with:
Slack integration for coding help in team conversations
Codex SDK for workflow automation
Admin dashboard for analytics, control, and reporting
According to OpenAI, engineers using Codex internally complete 70% more pull requests per week, and nearly all of OpenAI's own code now goes through Codex review before release.
Sora 2 API: Cinematic Creative AI
For creators, OpenAI announced the Sora 2 API, giving developers direct access to its cinematic text-to-video model.
The updated version adds fine control, enhanced realism, and for the first time, synchronized soundscapes that perfectly match the visuals.
The demos highlighted Sora 2's expanded creative capabilities.
Take a handheld iPhone clip and transform it into a stunning cinematic sequence.
Add ambient audio, synchronized voiceovers, and natural sound effects that match each scene.
Remix or extend scenes, change aspect ratios, and generate complex motion sequences from simple prompts.
In one example, Sora 2 turned a puppy photo into a vibrant video with a new 'puppy friend' running alongside.
In another, it produced a product concept video for a fictional e-commerce brand, complete with visuals, narration, and background music.
Early partners like Mattel are already using Sora 2 for prototyping toys and marketing content, transforming initial sketches into vivid promotional videos in minutes.
GPT-5 Family Expansion
OpenAI also expanded the GPT-5 model lineup to three versions:
GPT-5-Codex
Powers the new Codex environment, specialized for software engineering and complex reasoning across large codebases.
GPT-5 Pro
The highest-performing reasoning model to date, designed for industries like finance, healthcare, and legal services that demand precision and reliability.
GPT Real-Time Mini
A lighter, faster voice model delivering the same expressive quality as OpenAI's advanced voice model but at 70% lower cost, enabling real-time AI assistants and voice agents across multiple devices.
Sam Altman described voice as "one of the primary ways people will interact with AI," positioning Real-Time Mini as a bridge between conversational agents and the broader Internet of Things.
Q&A
Q: What was the core theme of OpenAI Dev Day 2025?
A: OpenAI positioned ChatGPT as a full-fledged development platform, not just an assistant, enabling developers to create conversational apps, deploy intelligent agents, and integrate monetization directly into conversations.
Q: What's new about ChatGPT Apps?
A:
"This is the next step in turning ChatGPT into a platform," says OpenAI CEO Sam Altman. "Now you can run every application from designing with Canva to booking with Zillow right within the chat, all powered by the App SDK."
Q: How does AgentKit change the agent-building process?
A:
"With AgentKit, anyone can create agents without complex stacks," says Christina, the OpenAI engineer who led the demo. "We built two secure, production-ready agents in under 6 minutes and deployed them in real time, with no code and no delays."
Q: What makes the new Codex different from previous versions?
A: The new Codex runs on GPT-5-Codex and handles both reasoning and execution. It can autonomously write, test, and refactor code.
"Engineering velocity is dramatically increasing," says Altman. "Codex is becoming the teammate every developer wants."
Q: What's special about the Sora 2 API?
A: Sora 2 adds synchronized audio and more realistic cinematic controls.
OpenAI's product lead said:
"This is where creativity meets control. You're not just generating video -- you can craft scenes with sound, emotion, and story structure."
Q: How is GPT-5 evolving?
A: GPT-5 now includes Pro, Codex, and Real-Time Mini models. Pro is optimized for high-accuracy reasoning in specialized domains, while Mini provides responsive, natural voice interactions for voice agents and devices.
Q: Why does this matter?
Sam Altman said:
"AI is no longer just a layer on top of software. It's becoming the platform itself -- an operating system for the AI economy."
Implications
OpenAI's Dev Day 2025 was not just a showcase -- it was a paradigm shift.
It's building the infrastructure for an AI-native economy where conversations become the new interface, apps become agents, and developers become platform partners.
ChatGPT Apps turn chat into the new app store.
AgentKit reduces agent development timelines from months to minutes.
Codex and GPT-5-Codex redefine software creation as collaboration, not labor.
Sora 2 makes cinematic storytelling accessible to anyone with a prompt.
This is a first step toward an internet where AI is not a layer on top of apps but the app itself, extending beyond OpenAI's ecosystem.
As Altman said, software used to take months or years to build.
Now with AI, minutes are enough -- and people who can imagine faster than they can code will lead the future of building.
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Source: Alicia Shapiro, AiNews, "OpenAI Dev Day 2025: ChatGPT Apps, AgentKit, Codex GA, and Sora 2 API", https://www.ainews.com/p/openai-dev-day-2025-chatgpt-apps-agentkit-codex-ga-and-sora-2-api, (2025-10-06)