DevDay 2025 keynote
Sam Altman · Oct 6, 2025 · 53m · San Francisco
Summary
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
- 1DevDay 2025 was held October 6, 2025 at Fort Mason in San Francisco.Source
- 2The Apps SDK launched in preview, letting developers build apps that run inside ChatGPT.3:46
- 3AgentKit was introduced as a complete toolkit: Agent Builder, Connector Registry and ChatKit.16:52
- 4Codex was cited alongside image generation and Sora as part of OpenAI's product lineup.30:41
- 5Codex is now generally available with a Slack integration and a new Codex SDK.31:22
- 6The Codex Slack integration lets teams tag @Codex directly in a channel or thread.33:16
- 7Apps SDK pilot partners included Booking.com, Canva, Coursera, Figma, Expedia, Spotify and Zillow.Source
Announced
1 available the same day| 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 |
Related keynotes
| Date | Keynote | |||
|---|---|---|---|---|
| Jun 2, 2025 |  Snowflake Summit 2025Sridhar Ramaswamy, Sam Altman, Sarah Guo · 58m · 3 announcedAgents, Data platforms, Models | Agents, Data platforms, Models | Snowflake highlighted deeper Apache Iceberg support, used by companies like Booking.com, via Catalog Linked Databases | 3 |
| Nov 6, 2023 | OpenAI DevDay 2023Sam Altman · 46m · 7 announcedModels, Agents, Pricing | Models, Agents, Pricing | GPT-4 Turbo supports up to 128,000 tokens of context, 16 times GPT-4's 8K, with knowledge updated to April 2023 | 7 |
About this keynote
Timestamps appear where the published captions place a highlight; the others link the official recap that states them.
Keynote page: www.youtube.com/watch?v=hS1YqcewH0c
- Sam AltmanCEO, OpenAI
Companies named: Booking.com, Canva, Coursera, Expedia, Figma, HubSpot, LY Corporation, OpenAI, Ramp, Spotify, Zillow
Last changed 2026-09-24.
- 2026-09-24 · address changed by seed
- 2026-09-24 · announcements changed by seed
- 2026-09-24 · takeaways changed by seed
- 2026-09-24 · themes changed by seed
- 2026-09-24 · basis changed by seed
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.