OpenAI DevDay 2026 Replay: Timestamped Guide to the Announcements

Melvin Vivas · X video post · 2026-09-30 · Open on X

Topics: Industry Trends & Job Market, AI Agents, Tool Use & MCP, AI Dev Tools & Productivity · Level: beginner

Summary

Melvin Vivas shares the replay of his OpenAI DevDay 2026 livestream, with timestamps for each announcement. Highlights are new models and pricing (GPT 6.1 Sol, Pro 500, Pro 200), developer APIs (Decisions API, Agents API), Codex products (Codex Spaces, Codex Cloud, Codex Security Cloud), Sign-in with ChatGPT, Plugin Extensions and the OpenAI Marketplace. It works as an index for jumping straight to the part you care about.

Key points

• The keynote with Sam starts at 36:06 in the replay.
• Dots, powered by Astra (compared to Grok Bot), is at 37:11. Codex Spaces, where you work alongside Dots, is at 44:00.
• GPT 6.1 Sol (56:16) costs about 1/5th the price of Astra with close to its intelligence. It runs at about 300 tok/s, roughly 8x faster than Astra.
• Plans: Pro 500 gives 25x the usage of Plus (57:20), and Pro 200 is back (57:42).
• Developer APIs: the Decisions API at 58:06 (the creator guesses it answers Jev) and the Agents API at 1:05:02.
• Codex Cloud (1:04:02) runs tasks remotely, so you can close your laptop. Codex Security Cloud follows at 1:04:34.
• Sign-in with ChatGPT lets you use ChatGPT credits in tools like Devin, Hermes and T3Code (1:20:23). Plugin Extensions (1:21:00), the OpenAI Marketplace (1:23:07) and Banked Reset (1:27:12) come after.

Resources mentioned

• OpenAI DevDay livestream replay · video · x.com · free
  Replay of Melvin Vivas's X Live watch party covering the full OpenAI DevDay 2026 keynote.
  Also in: OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)
• GPT-6.1 Sol · tool · openai.com · paid
  A new OpenAI model announced at DevDay 2026 (name as written in the machine transcript), offered with Fast and Ultra fast speed tiers.
  Also in: JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai) (Melvin Vivas on X · notes), Comparing Coding Models on the Same Task in Devin iOS (Melvin Vivas on X · notes), Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), Pi Agent Council: Ask Multiple LLMs in Parallel and Compare Their Advice (Melvin Vivas on X · notes) and 9 more
• Codex Cloud · tool · learn.chatgpt.com · paid
  OpenAI's cloud-run version of Codex, so coding tasks keep running remotely.
  Also in: Creator's favorite OpenAI DevDay announcements (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)
• Codex Spaces · tool · learn.chatgpt.com · check price
  Codex workspace where you collaborate with Dots.
  Also in: OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)
• Codex Security Cloud · tool · learn.chatgpt.com · paid
  A new Codex product that runs in cloud environments and helps defenders harden their infrastructure.
  Also in: OpenAI DevDay 2026 Recap: Dots, Agents API, Codex Cloud & Marketplace (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)
• OpenAI Agents API · tool · developers.openai.com · paid
  OpenAI's managed API for building and running cloud agents on a hosted Codex harness, with orchestration, sessions and context management built in.
  Also in: OpenAI DevDay 2026 Recap: Dots, Agents API, Codex Cloud & Marketplace (Melvin Vivas on X · notes), Creator's favorite OpenAI DevDay announcements (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes), Building Software Factories on the OpenAI Agents API (Codex-Powered) (Melvin Vivas on X · notes) and 1 more
• OpenAI Decisions API · tool · openai.com · paid
  A new OpenAI API, shown as a preview, that lets the model respond and make decisions.
  Also in: OpenAI DevDay 2026 Recap: Dots, Agents API, Codex Cloud & Marketplace (Melvin Vivas on X · notes), Creator's favorite OpenAI DevDay announcements (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)
• Sign in with ChatGPT · tool · developers.openai.com · check price
  A sign-in option that lets third-party apps use your ChatGPT account for access to models.
  Also in: T3 Code Adds Sign in with ChatGPT, With Support for Multiple Accounts (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)
• OpenAI Marketplace · website · openai.com · paid
  OpenAI's new marketplace where developers sell products and enterprises can pay with their OpenAI commitment.
  Also in: OpenAI DevDay 2026 Recap: Dots, Agents API, Codex Cloud & Marketplace (Melvin Vivas on X · notes), Creator's favorite OpenAI DevDay announcements (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes)

Try this

• Watch the DevDay replay, using the timestamps to jump to the announcements that matter to you.