🔍 Read the full analysis: OpenAI Dev Day 2026: The News Explained For AI Developers on ThorstenMeyerAI.com
TL;DR
At DevDay on 29 September 2026, OpenAI announced more than 20 products and features positioning ChatGPT as a shared surface for humans and agents, reaching a reported 1.2 billion weekly users. The headline items for developers are Dots (always-on GPT-6 Astra agents), a major plugin upgrade, the Decisions API, computer use in the Agents API, Sign in with ChatGPT, and GPT-6.1 Sol at one-fifth of Astra’s token price.
OpenAI used its DevDay on 29 September 2026 to reposition itself from chatbot maker to agent platform, announcing more than 20 products and features and pitching ChatGPT as a shared surface for humans and agents that the company says reaches 1.2 billion weekly users. For developers, five announcements carry the most weight: Dots, always-on agents powered by GPT-6 Astra; a major upgrade to the plugin system; the Decisions API; computer-use support in the Agents API; and Sign in with ChatGPT with 16 launch partners.
Dots are OpenAI’s biggest consumer bet: persistent agents that work toward user goals around the clock, learn preferences over time and run several projects at once. Each dot runs on GPT-6 Astra with its own cloud computer and browser, and can reach over 4,000 apps through plugins. They are available now to Pro and Business Premium users in eligible markets; Enterprise, Edu and Healthcare customers get access through an admin-enabled beta that is off by default. The first dot is included in the plan, and chatting with it does not count toward usage limits, though tasks it starts in Codex or ChatGPT Work do.
OpenAI presented control as the design constraint. Dots run on separate cloud computers, can use saved passwords without exposing them to the model, and are governed through Custom Rules, an Activity View and monitoring that can pause or stop a dot. Certain sensitive actions, such as changing a password, always stay with the user. OpenAI still warns that dots can make mistakes, according to the company’s own materials.
The plugin system becomes the distribution channel into ChatGPT, Codex and dots. New additions include plugin extensions that live in the ChatGPT sidebar — with Figma and Adobe demonstrating integrations — a Plugin Creator and new submission flow, improved discovery, Sites that host plugins for teams, and MCP events that let a plugin trigger automations when something changes in a connected app. An OpenAI Marketplace lets eligible enterprise customers spend part of their OpenAI commitment with 32 launch partners, including Figma, Adobe, Salesforce, ServiceNow, Harvey, CrowdStrike and Baseten.
The Decisions API applies GPT-6 Luna to narrow, repetitive choices: developers define questions with a finite list of allowed answers, supply text or images as context, and receive a selection usable for classification, routing or choosing an agent’s next action. It is in limited preview. The Agents API now supports computer use, letting agents operate software through its interface, with OpenAI running the Codex harness. Sign in with ChatGPT lets users bring their existing plan to 16 launch partners, which makes a free-core-app-with-paid-upsells model workable, according to the announcement.
On models, OpenAI announced GPT-6.1 Sol, described as near-Astra intelligence at one-fifth of Astra’s token prices, alongside the rest of the slate including Ultrafast and Pro 500.
OpenAI DevDay 2026 at a glance
The five launches that matter, plus Sol
The rest of the slate
Collaboration
ChatGPT SpacelivePagesliveCollaborative slidesnext few weeksTeams and Team Taskslive@ChatGPT in Slack and TeamsliveMeetings pluginbeta, macOSShareable profilesliveCodex
Codex CloudliveCLI refreshvoice, /agentsCode ReviewliveCodex Security CloudlivePlans, enterprise, speed
Pro 500$500, 25× PlusUltrafastAstra now, Sol soonPrivate IntelligencePrivate Inference this fallBedrock Managed Agentsruns in AWSOpenAI Marketplace32 partners, applyWhy Agent Distribution Decides Who Wins
The strategic shift matters because plugin distribution now decides who gets work from agents. Dots reach over 4,000 apps through the plugin ecosystem, and OpenAI’s own commentary makes the point plainly: an agent picks a business by outcome, not by brand. A customer asks for a result, ChatGPT understands the job, a plugin is selected, and the business behind it does the work — meaning a vendor can be hired before the customer knows its name.
That reframes the developer question from „how do I market my app“ to „why was my plugin selected or ignored“, which puts the burden on measuring intent, activation and completion. The OpenAI Marketplace also changes enterprise procurement: committed OpenAI spend can now flow to third-party vendors such as Salesforce and ServiceNow.
On the pricing side, GPT-6.1 Sol at one-fifth of Astra’s token prices gives cost-sensitive builders a cheaper path to near-frontier intelligence, though OpenAI’s own framing of „near-Astra“ intelligence is a company claim rather than an independently verified benchmark.
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From Chatbot to Platform: The DevDay Arc
The 29 September event continues OpenAI’s multi-year move up the stack from a chat interface to a developer platform. Earlier DevDays introduced the Assistants API and, later, the Agents SDK; this year’s event pushes further into autonomous, always-on agents and third-party distribution inside ChatGPT itself.
The developer documentation also signals openness to rival ecosystems: it includes conversion specs for restaurant reservations, quote requests and product checkout, plus a guide for submitting a Claude Code plugin — suggesting OpenAI wants to accept skills and plugins built for other agent ecosystems, not just its own.
For enterprises, the specialist dots program extends the concept: agents with their own identity, credentials and IT-provisioned hardware, taking on defined responsibilities. OpenAI is starting with pilots in procurement, invoice processing, email marketing, customer support and commercial contracting, and plans a Microsoft Agent 365 integration for governance.
What Is Still Preview or Promise
Several key pieces are not generally available. The Decisions API is in limited preview, with a broad release promised but not dated beyond „in the“ coming period in OpenAI’s materials. Texting with dots is listed as coming, while voice calls work today. Teams of dots working together are described as something OpenAI „envisions“ later — a roadmap statement, not a shipped feature.
Enterprise pilots for specialist dots in procurement, contracting and other domains are just that: pilots, with the Microsoft Agent 365 governance integration planned rather than live. The 1.2 billion weekly users figure and GPT-6.1 Sol’s „near-Astra intelligence“ claim come from OpenAI itself and have not been independently verified, and no third-party benchmarks were cited at announcement. Pricing for additional dots and per-dot speed and output upgrades was described only in general terms.
Watch the Preview Expansions and Marketplace
Developers should watch for the broad release of the Decisions API, the widest unknown in the timeline, and the rollout of texting for dots. Enterprise teams will be evaluating the specialist-dot pilots and the Microsoft Agent 365 governance integration as those mature.
For builders, the immediate practical steps are concrete: publish plugins to the shared directory using the new Plugin Creator flow, evaluate the conversion specs for reservations, quote requests and checkout, and consider porting existing Claude Code plugins. Companies targeting enterprise buyers should assess whether listing in the OpenAI Marketplace — where committed OpenAI spend can flow to partners — fits their sales model. OpenAI has not announced the date of its next DevDay or further model releases beyond the current slate.
Key Questions
What are Dots and who can use them?
Dots are always-on agents powered by GPT-6 Astra, each with its own cloud computer and browser, able to reach over 4,000 apps through plugins. They are available now to Pro and Business Premium users in eligible markets, and to Enterprise, Edu and Healthcare customers via an admin-enabled beta that is off by default.
Do Dots cost extra on an existing plan?
According to OpenAI, the first dot is included in the plan. Chatting with it does not count toward usage limits, but tasks it starts in Codex or ChatGPT Work do. Additional dots and higher speed and monthly output per dot will be purchasable later.
What is the Decisions API and when is it available?
The Decisions API applies GPT-6 Luna to narrow, repetitive choices: you define questions with a finite list of allowed answers, provide text or images as context, and get back a selection. It is currently in limited preview; a broad release date has not been specified.
Why should developers care about the plugin upgrade?
Plugins are now the distribution path into ChatGPT, Codex and dots. OpenAI’s commentary argues that agents select businesses by outcome, not brand, meaning your plugin may be chosen before a customer knows your name. Discovery, conversion tracking and marketplace placement become the new competitive levers.
Is GPT-6.1 Sol cheaper than GPT-6 Astra?
OpenAI describes GPT-6.1 Sol as offering near-Astra intelligence at one-fifth of Astra’s token prices. That characterization and the performance claim come from OpenAI and have not been independently benchmarked.
Source: ThorstenMeyerAI.com
