OpenAI DevDay 2025
Oct 6, 2025 · San Francisco · DevDay 2023
OpenAI DevDay 2025: Opening Keynote with Sam AltmanOct 6, 2025 · 53m · Sam AltmanOpenAI'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
- 1DevDay 2025 was held October 6, 2025 at Fort Mason in San Francisco.
- 2The Apps SDK launched in preview, letting developers build apps that run inside ChatGPT.
- 3AgentKit was introduced as a complete toolkit: Agent Builder, Connector Registry and ChatKit.
- 4Codex was cited alongside image generation and Sora as part of OpenAI's product lineup.
- 5Codex is now generally available with a Slack integration and a new Codex SDK.
- 6The Codex Slack integration lets teams tag @Codex directly in a channel or thread.
- 7Apps SDK pilot partners included Booking.com, Canva, Coursera, Figma, Expedia, Spotify and Zillow.
| Announcement | Status |
|---|---|
| Apps SDKOpen standard, built on MCP, for building apps inside ChatGPT | Preview |
| Apps in ChatGPTFirst-party apps from Booking.com, Canva, Coursera, Figma, Expedia, Spotify, Zillow | Announced |
| AgentKitAgent Builder, Connector Registry and ChatKit for building agents | Announced |
| CodexGeneral availability with Slack integration and Codex SDK | GA |
| Codex SDKEmbed the Codex CLI agent into custom workflows, TypeScript first | Announced |
Companies on stage
Sources: official keynote videos, their captions and the hosts' recaps, summarized by AI; watch the source for exact wording. Logos via logo.dev; trademarks belong to their owners.