OpenAI DevDay 2026 live blog

AI小蝌蚪AI 前沿📡 Simon Willison's Weblog2026-09-301455 阅读💛 86 收藏

OpenAI DevDay 2026 live blog

29th September 2026

I’m at OpenAI DevDay today, in Fort Mason, San Francisco. Same as last year I’ll be live blogging the keynote and some other notes during the day.

OpenAI gave me a free ticket and a seat in the “creator” area for the keynote.

09:27 I'm in the room for the keynote, which starts in half an hour.

This year I vibe-coded a system for more easily adding photos to my live blog. I intended to do that using Codex Cloud (I built it on my phone on the way to the venue) but ran into problems with that and switched to Claude Code for web instead.
Attendees sit facing a large stage screen displaying a pattern made of colored dots in a bright industrial hall with exposed roof trusses and stage lights.

10:01 Sam Altman is on stage, welcoming us to DevDay. He promises "our best DevDay yet".

10:02 Showing features they've shipped that people asked for. Codex on Linux and Codex on your phone both got some applause.

10:03 Today, a product to feel like a "whole new way of working with AI". My guess is that it's a personal agent similar to Muse...

10:03
A presenter stands onstage before an audience beside a giant screen displaying “dots” above four colorful cartoon characters. The event is in a large indoor venue with exposed roof trusses and stage lights.

10:03 It's called "Dots".

10:05 It does look very Muse-like. You get to pick its name, then it's represented by a cute blob-like avatar. (My Muse avatar is a pelican.)

10:06 This demo video includes a whole lot of voice interactions, presumably using GPT-Live or a new generation of that technology.

10:06
A presenter stands before an audience onstage beside a large screen displaying the “dots” logo and a mock phone conversation with an assistant named Alfred. The messages read: “good morning,” “Morning Sam! I’ve caught up on your Slack and email. Nothing urgent, just three things to look at when you get to the office,” and “Let me know once you’re in and had your coffee.”

10:07 Dots are "powered by Astra". That would be an expensive default model!

10:08 A very ambitious use-case, migrating an API. I'm surprised that they went for such a code-heavy price sample so early on, I guess this is a developer audience.

10:09 Sam called Astra "our most aligned model", to allow you to trust your Dot with "as much responsibility as you are comfortable with".

10:09 "You also need a place four your team to collaborate with their Dots". So they are introducing ChatGPT Space.

10:10

These Spaces look like shared artifacts, maybe Google Docs meets the artifacts pattern.

Sam Introduces Holly Li.

10:11 Holly is talking through a scenario building fictional music app. Holly has a Dot called "Dottie", which has access to ChatGPT, Slack, Teams, and more.

10:12 This UI really does look like Meta's Muse agent, currently still at number one on the iOS App Store free list.
A close-up of a smartphone shows a chat with an assistant named “dottie.” After the user asks, “what time is my lunch party,” the assistant lists work updates: a launch review moved earlier, calendar updated, analysis of Blossom feedback for GTM strategy, and a new homescreen revision; a menu with “Copy,” “Select text” and “Reply” is open.

10:13 Live demo! "Dottie is having a slow morning" - we got a "still checking" and an embarrassing silent moment.

10:14 Now we're in ChatGPT Space. It has a Notion-style slash menu.
A computer screen shows a document editor with an FAQ about saving music and offline listening, plus a menu for adding visualizations, pages, images, files and headings. Below, a “Customer Feedback” section is being drafted; a status bubble says “Working for 33s” and “Thinking…”.

10:16 People at OpenAI started delegating to their Dots directly in Slack, which have their own identities in OpenAI Slack. I guess this is OpenAI's answer to Claude Tag.

10:17 "Dottie can use Codex on my laptop to build the app and launch it in the iPhone Simulator."

10:18 ChatGPT Pro and Enterprise customers get access to Dots today.

10:19
Sam Altman stands on a conference stage before a seated audience, beside a large screen reading “People and AI, working together.”

10:19 They're also building "specialist dots" for legal, finance, etc. They'll collaborate with enterprises on this, and are also doing a thing with Microsoft 365 around these.

10:20 "The second big part of today" is about platforms. Says says: Great models. Tools - access to the same tools used within OpenAI. And distribution.

10:21 People have been asking for GPT-6 Astra but cheaper and faster. Today they're launching GPT-6.1 Sol.

10:21 "Near-Astra level intelligence at a fifth of the price".

10:22 6.1 Sol is launching by today.
A presenter speaks onstage at a technology event, facing an seated audience beneath exposed ceiling trusses. The screen reads “GPT-6.1 Sol” and compares prices with “GPT-6 Astra”: input $2.00 vs. $10.00, cached input $0.10 vs. $1.00, and output $10.00 vs. $50.00.

10:22 Also today: Ultrafast. 8x faster - up to 300 tokens/second. Available in the API, ChatGPT, and Codex. 6x the price of standard - "you know what, it's worth it" says Sam.

10:22 Ultrafast is available for Astra 6 today, and Sol 6.1 soon.

10:23 New subscription plan: Pro 500. This gives you access to Ultrafast, and 25x the usage of Plus. They're also putting their $200/month plan back on sale for new subscribers today.

10:24 Also today: previewing a new Decisions API. Lets the model respond "in a fraction of a second". It works by giving the Luna model "a predefined set of options to choose from". Sounds like their response to Jev, which came out of stealth less than two weeks ago!

10:25 Sam is now talking about Research acceleration: The view inside OpenAI. He brings up Tejal Patwardhan to talk about how they're using their own models to accelerate their research.

10:26 Tejal is talking about Astra's abilities at Computer Use. "Our models helped optimize the harness we use for Computer Use". They accelerated the harness, getting "a 2x latency win that we've shipped to all of you".

10:27 "Our models are much less likely to make a mistake while navigating the desktop and the browser" - which "should really matter for all your Dots".

10:28
A presenter addresses a seated audience beside a large screen reading, “Agents are increasingly solving more complex problems for researchers.” A chart compares January and July 2026 agent success rates across tasks of increasing duration; a side panel reports success on 8–16-hour tasks with zero interventions rising from 10% in January to 35% in July.

10:29 Sam is back. Now talking about "supporting developers" - giving developers access to the same foundations they have at OpenAI. This starts with the open source Codex harness. Codex is also now "fully in the cloud". I had a bad experience with Codex in the cloud just two hours ago, so hopefully this new launch will make that a whole lot better.

10:30 Today launching "Codex Security Cloud", with "Daybreak Blue access" - scheduled scans, automatic de-duplication. Also launched today.

10:31 There's a (new?) Agents API, now with Computer Use.

10:31 (My eyes glazed over a bit at the AWS partnership section, but it only lasted a few seconds.)

10:32 Sam is dashing through a section about enterprise privacy features.

10:33 Sam is boasting about the "most performant and reliable API" available today. Feels like a jab at Claude, especially given they had an outage just this morning.

10:33 Romain Huet just made a fun entrance, with a live demo as he walked into the venue (with camera footage on screen.)

10:34 Looks like he's going to show off some 3D modeling with Ultrafast, in a live demo. The voice mode is not collaborating! He's going to have to type instead.

10:35
A large display at a tech event shows a computer-generated view of Fort Mason’s Festival Pavilion arranged for a conference, with rows of chairs facing a stage beneath exposed roof trusses. A Codex sidebar lists projects including “Fort Mason live demo” and “Map out the venue in 3D”; audience members’ heads are visible along the bottom.

10:36 This is a good demo. He's typing commands like "put the livestream on the big screen" and a moment later the video appears on the big screen in the 3D model of the venue.

10:38 Romain is live coding an app to distribute free tickets to random attendees, using Ultrafast.
A large monitor at an OpenAI DevDay display shows a dark “DevDay Lucky 3” webpage offering three free tickets to DevDay 2027, with three ticket cards and a “Spin” button. A coding assistant panel beside it says the giveaway app is built and the build passed verification.

10:39 (This fits a pattern - in previous DevDays Romain has frequently run live demos that interact with the audience in interesting ways.)

10:39 Now we have an Astra Computer Use demo, where Astra figures out how to play a new (vibe coded) game.

10:40
A large screen in an industrial event space shows a space-flight game called “ASTRA ADVENTURES,” with a spacecraft approaching asteroids and a planet. The interface shows velocity 018 m/s, thrust 20%, and controls including “CRUISE,” “PATROL,” “CHASE,” “INVESTIGATE” and “BATTLE STATIONS”; audience members’ heads are visible along the bottom.

10:41 ... and a demo showing Codex Remote building an app for the iPhone Duo, showing the UI from the simulator in the Codex UI.

10:42 Now Romain is switching to Codex Cloud, with "rewrite the entire backend in Rust".

10:43 Last demo, this time using Hugging Face Microduck robot.

10:44
A man wearing a headset microphone stands behind a wooden lectern beside a small purple-and-yellow robot, with laptops on the lectern. A wood-paneled wall with a vertical green stripe forms the backdrop.

10:46 Sam is back. 1.2B people use ChatGPT every week. "We've tried this before with variable results", but they're trying this again. First up: sign in with ChatGPT, which lets people sign into your app and use the tokens they are paying for already. I've wanted this one for years!

10:46 Also: Plugin extensions - plugins that are "entire applications" that feel native to ChatGPT (and Codex).

10:47 Here's an sample ChatGPT plugin from Adobe.
A presenter stands onstage at a technology event beside a large screen headed “Build your product.” The screen shows a software interface generating or editing an image of a smiling woman with a suitcase, while audience members watch from the foreground.

10:48 You can also build ChatGPT Sites and share them with specific other people. (I admit I thought they had that feature already.)

10:49 And they're launching the OpenAI Marketplace today, with these partners.
A large black stage display reads “OpenAI Marketplace,” with rows of logos including Adobe, Canva, Figma, Notion, Salesforce, Vercel and Zendesk. Audience members watch from the foreground beneath the venue’s exposed roof trusses and stage lights.

10:49 Finishing with a feel-good bit profiling some people who are building on OpenAI's platform. There's a video.

10:51

Keynote over.

On the OpenAI blog: GPT-6.1 Sol, Introducing dots (I guess they're going with lowercase "dots" for that product name), and a DevDay 2026 Recap post.

10:52 And they're giving every attendee one of these. And a banked reset too.
A presenter stands at the left of a stage before an audience, beside a large screen reading “Codex Game Studio” and “Today at 1PM,” with an image of a handheld game console.

10:53 They pressed the button live in the room. The reset affects everyone in the world, not just the DevDay attendees.
A large presentation screen at a conference shows an audience seated in rows on the left and a blue 3D graphic on the right: a rounded object with a cloud-like symbol sits on a black-and-white striped pedestal. Visible ceiling trusses and stage lights hang above, with attendees’ heads in the foreground.

11:32 Well this is disappointing. I tried the create your dot link from their dots announcement and it told me to switch to a desktop!
A white screen displays a gray ring above the message, “Please create a dot on your computer,” with smaller text: “Dots work best on your desktop computer. Please get set up there instead.” A black button at the bottom says “Back to ChatGPT.”

12:47 I'm now in the ChatGPT Sites session. Jon Abrams initially prototyped this tool because he was frustrated at how hard it was to ship internal tools (I’ve felt that pain at many previous employers). It launched earlier this year and is already hosting 8m sites, and 70% of OpenAI employees are making their own sites.

12:47 Katia Gil Guzman demonstrates a spreadsheet of DevDay launches, and shows how to turn that into a Site. "Can you turn this sheet into a Launch Radar app in a new folder and publish it as a Site?"

12:48
Two presenters stand at wooden podiums on either side of a large stage screen, addressing an audience seated in a dark auditorium. The screen shows a software interface titled “Build and publish launch radar,” with a prompt about turning a Google Sheet into a launch radar app.

12:49 You can also tell Codex to keep an eye on e.g. a shared sheet and continually update the site with new details.

12:50 Sites get a SQLite database! They're launching scheduled tasks for Sites today.

Posted 29th September 2026 at 3:55 pm · Follow me on Mastodon, Bluesky, Twitter or subscribe to my newsletter

文章评论（1）

雪知秋14 分钟前

这个比较实用，已转发给同事。

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