What was announced at the OpenAI DevDay 2025 keynote?

Apps SDK (Preview), Apps in ChatGPT (Announced), AgentKit (Announced), Codex (GA), Codex SDK (Announced).

What were the highlights of the OpenAI DevDay 2025 keynote?

OpenAI's third annual DevDay, held at Fort Mason in San Francisco, launched AgentKit, the Apps SDK for ChatGPT, and general availability of Codex. DevDay 2025 was held October 6, 2025 at Fort Mason in San Francisco. The Apps SDK launched in preview, letting developers build apps that run inside ChatGPT. AgentKit was introduced as a complete toolkit: Agent Builder, Connector Registry and ChatKit.

Who gave the OpenAI DevDay 2025 keynote?

Sam Altman, on 2025-10-06 in San Francisco.

OpenAI DevDay 2025: Opening Keynote with Sam Altman

Sam Altman · Oct 6, 2025 · 53m · San Francisco

Watch on YouTube Official recap

OpenAI's third annual DevDay, held at Fort Mason in San Francisco, launched AgentKit, the Apps SDK for ChatGPT, and general availability of Codex.

Key themes: Agents, AI coding, Models · AI-written summary from the published transcript

Where each highlight is said52:39

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3:46
The Apps SDK launched in preview, letting developers build apps that run inside ChatGPT.
16:52
AgentKit was introduced as a complete toolkit: Agent Builder, Connector Registry and ChatKit.
30:41
Codex was cited alongside image generation and Sora as part of OpenAI's product lineup.
31:22
Codex is now generally available with a Slack integration and a new Codex SDK.
33:16
The Codex Slack integration lets teams tag @Codex directly in a channel or thread.
6
DevDay 2025 was held October 6, 2025 at Fort Mason in San Francisco. Source
7
Apps SDK pilot partners included Booking.com, Canva, Coursera, Figma, Expedia, Spotify and Zillow. Source