What OpenAI’s 2025 Developer Day Reveals: New Apps, AgentKit, and GPT‑5 Pro Details

Integrated Apps in ChatGPT

ChatGPT now supports direct interaction with a set of partner applications: Booking.com, Canva, Coursera, Expedia, Figma, Spotify, and Zillow. Users can invoke an app by mentioning its name in a prompt (e.g., "coursera teach me machine learning") and ChatGPT will establish the connection, present an interactive UI, and return results within the conversation. OpenAI has announced that eleven additional partner apps will be added by the end of the year.

Apps SDK

The open‑source Apps SDK, built on the MCP (Model‑Center‑Protocol) standard, enables developers to create, test, and submit apps for the ChatGPT ecosystem. Key capabilities include:

Custom UI definition and interaction logic.

Local testing via the ChatGPT developer mode.

Future support for a submission, review, and publishing workflow, plus a searchable app directory for end users.

AgentKit Toolkit

AgentKit is a comprehensive suite for building, deploying, and optimizing intelligent agents. It consists of three main modules:

Agent Builder : a visual canvas where developers drag‑and‑drop nodes to compose workflows, preview execution, configure security rules, and manage versioned agents.

Connector Registry : a centralized registry that stores credentials and connection settings for data sources and tools (e.g., Dropbox, Google Drive, SharePoint, Microsoft Teams) and supports third‑party MCP services.

ChatKit : a ready‑made chat interface that can be embedded in products or websites, eliminating the need to develop a custom chat UI.

Enhanced Evals Capabilities

OpenAI expanded the Evals platform with four new features that help developers assess and improve agents:

Dataset creation : build test datasets from scratch, augment them with automatic scoring and optional human annotation.

Trajectory scoring : evaluate an agent’s end‑to‑end workflow and pinpoint weak points via automated scores.

Automatic prompt optimization : generate improved prompts based on annotation feedback and scorer output.

Third‑party model support : evaluate models from other vendors within the same Evals framework.

These tools are available at no extra cost beyond standard API usage.

Codex Updates

Codex, the AI programming assistant, is now generally available with three new capabilities:

Slack integration : users can @‑mention Codex in Slack channels to assign tasks, ask questions, and receive execution links directly in the conversation.

Codex SDK : provides a CLI‑based agent that can be embedded in workflows. It includes TypeScript support, new GitHub Actions for CI/CD, and cloud‑based execution endpoints.

Management tools : administrators can edit or delete Codex cloud environments, set secure defaults, and monitor usage through dashboards.

New Model Releases

OpenAI opened API access to the following models:

GPT‑5 Pro : priced at $15 per 1 M input tokens and $120 per 1 M output tokens.

Sora 2 : a real‑time video generation model that supports control over duration, aspect ratio, and resolution.

GPT‑Realtime‑Mini : a smaller, cheaper voice model that costs roughly 30 % of the original GPT‑Realtime price while retaining comparable audio quality.

All announced tools and models are accessible through the standard OpenAI API endpoints; no additional licensing fees are required beyond the per‑token usage charges.