OpenAI's DevDay in San Francisco featured major platform updates, new developer tools, and product launches aimed at accelerating AI app development and software creation.
Key announcements included the Apps SDK for building native apps in ChatGPT, Agent Kit for deploying intelligent agents, significant enhancements to Codex (OpenAI's coding assistant), and new model releases (GPT-5 Pro and Sora 2).
Live demos showcased building apps and agents, real-time integrations, and creative applications, with preview access and documentation available immediately.
The event stressed OpenAI’s commitment to empowering developers and creators, providing faster, more flexible, and highly integrated AI development capabilities.
Action Items
Available Today – All Developers: Download and begin testing the new Apps SDK in preview.
Available Today – All Developers: Start building with Agent Kit and review the published developer guidelines.
This Year – OpenAI: Release the app submission and review system and launch the App Directory for user browsing and discovery.
Soon – OpenAI: Share more details and options for app monetization.
Available Now – Engineering Teams: Integrate Codex with Slack, utilize the Codex SDK, and explore new admin and analytics features.
Available Today – Developers: Access GPT-5 Pro and Sora 2 preview in the API for enhanced accuracy, depth, and creative outputs.
Ongoing – All: Provide feedback to OpenAI on the new SDKs, agents, and model updates.
Apps SDK and Building Apps Inside ChatGPT
Apps SDK (in preview today) now enables developers to build native, interactive, and personalized apps within ChatGPT, leveraging a full-stack framework built on the open MCP standard.
Users can invoke apps directly by name during conversations or discover them through contextual recommendations.
Initial live demos showed deep integrations with Coursera, Canva, Zillow, and others, demonstrating inline and full-screen app experiences within ChatGPT.
App discovery is enhanced with conversation-based surfacing, inline rendering, and recommendations.
Future features include monetization options like Agentic commerce protocol and instant checkout, broader app directory, and a tiered model for app prominence based on design/functionality.
Developer guidelines and the SDK are published for early access, with app review and submission set to launch later this year.
Agent Kit: Building and Deploying Agents
Agent Kit (launched today) provides modular tooling for building, deploying, and optimizing agents—from prototyping to production—with reduced complexity.
Core capabilities include:
Agent Builder for visual workflow and agent logic assembly.
Chat Kit for embedding customizable chat agents in any app.
Integrated evaluation tools: trace grading, datasets, and prompt optimization, including external model evals.
Secure connector registry for integrating agents with both internal and third-party systems.
Live demo built and deployed a session-recommendation agent for the DevDay website using Agent Kit in under 8 minutes, including visual widgets and guardrails for privacy and brand voice.
Published developer guidelines cover standards for app listing and elevated visibility.
Codex: New Features for Software Development
Codex, OpenAI’s AI-powered software engineering agent, is now out of research preview and generally available, running on the advanced GPT-5 Codex model optimized for coding.
Codex integrates seamlessly across developer tools (IDE, terminal, GitHub, cloud) and offers:
Slack integration for team-based code collaboration.
Codex SDK for workflow automation and extensibility.
Enhanced admin, environment controls, analytics, and dashboards for teams and enterprises.
Demos highlighted Codex’s agentic capabilities, including controlling hardware (cameras, lighting), voice integration, and live in-app code modification without manual coding.
Major productivity gains reported internally and by customers (e.g., Cisco), with rapid growth in daily usage and code review efficiency.
New Models and Creative Tools
GPT-5 Pro is now available via API, providing high-accuracy, deep reasoning, and advanced capabilities for complex domains (finance, legal, healthcare, etc.).
Sora 2 (video generation) is released in API preview, enabling developers to generate controllable, high-quality, and sound-synchronized videos.
Sora 2 supports aspect ratio, video length, remixing, and real-world asset integration, as demonstrated in creative and commercial use cases (e.g., Mattel concept development).
Continued investment in tools for creators and multimodal experiences, with expanded access and API flexibility.
Decisions
Launch of Apps SDK in ChatGPT (Preview) — To empower developers to build native, discoverable apps with full-stack capabilities inside ChatGPT.
Deployment of Agent Kit — To lower the barrier and time to production for intelligent agent development and deployment.
Codex General Availability & Team Features — To address growing demand from teams and enterprises and accelerate software engineering productivity.
Release of GPT-5 Pro and Sora 2 in API — To broaden accessible, state-of-the-art models for developers focused on advanced reasoning and creative applications.
Open Questions / Follow-Ups
Timeline and specifics for broader monetization features in the App Store/App Directory.
Criteria and process details for app review and directory featuring in upcoming releases.
Ongoing opportunity for developer feedback on SDKs, Agent Kit, and new models.