OpenAI Dev Day 2026: A Closer Look At The Major Updates

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OpenAI used its DevDay on 29 September 2026 to reposition itself from a chatbot maker to an agent platform, announcing more than 20 products and features and pitching ChatGPT as a shared surface for humans and agents that, according to the company, reaches 1.2 billion weekly users. The announcements with the largest consequences for developers and businesses were Dots, always-on agents powered by GPT-6 Astra; a major plugin upgrade; a Decisions API; computer-use support in the Agents API; and Sign in with ChatGPT.

Dots are OpenAI’s biggest consumer bet: persistent agents that work toward a user’s goals around the clock, learn preferences over time and keep several projects moving at once. Each dot runs on GPT-6 Astra with its own cloud computer and browser, reaches over 4,000 apps through plugins, and is available on ChatGPT desktop, web and mobile, as well as Slack and Teams. Voice calls work today; texting is coming. The first dot is included in Pro and Business Premium plans in eligible markets, and chatting with it does not count toward usage limits, though tasks it starts in Codex or ChatGPT Work do. OpenAI says early examples include a dot that noticed a tester had not invoiced a publication, prepared the invoice and sent it after approval.

OpenAI framed control as the design constraint for Dots: each runs on its own cloud computer, dots can use saved passwords without exposing them to the model, and proactive background research is limited to read-only tools. Custom Rules let users allow, require approval for or block specific actions; an Activity View shows background work; and monitoring can pause or stop a dot. Sensitive tasks such as changing a password always stay with the user. OpenAI still warns that dots can make mistakes. An enterprise version, specialist dots, gives agents their own identity, credentials and IT-provisioned hardware, with pilots starting in procurement, invoice processing, email marketing, customer support and commercial contracting, and a planned Microsoft Agent 365 integration for governance.

Plugins became the primary route into ChatGPT, Codex and dots. The upgrade includes plugin extensions that live in the ChatGPT sidebar — Figma and Adobe showed integrations — a new Plugin Creator and submission flow, improved discovery in the directory and inside conversations, Sites that can host plugins for teams, and support for the proposed MCP Events specification, which lets a plugin trigger an automation when something happens 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. Developer docs also list conversion specs for restaurant reservations, quote requests and checkout, plus a guide for submitting a Claude Code plugin — a sign, the source commentary notes, that OpenAI wants to accept plugins built for other agent ecosystems.

Two further announcements target developers. The Decisions API applies GPT-6 Luna to narrow, repetitive choices: developers define questions with a finite list of allowed answers, send 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, with a broad release promised. The Agents API now supports computer use, letting agents operate software through its interface, with OpenAI running the Codex harness on the developer’s behalf. Sign in with ChatGPT lets users bring their existing ChatGPT plan to 16 launch partners, a model that makes a free core app with paid upsells viable. On the model side, OpenAI announced GPT-6.1 Sol, which it describes as delivering near-Astra intelligence at one-fifth of Astra’s token prices, alongside Ultrafast and Pro 500 offerings.

Why Distribution Shifts to Agent-Mediated Software

The announcements change how software reaches users. Because dots reach over 4,000 apps through the plugin ecosystem, plugin distribution now decides which businesses get work from agents. OpenAI’s own framing, as summarized in the source commentary, is that an agent picks a business by outcome rather than by brand: the customer asks for a result, ChatGPT understands the job, and a plugin is selected — meaning a business can be ‘hired’ before the customer knows its name. For builders, the practical question becomes why a plugin was selected or ignored, which points to measuring intent, activation and completion rather than traditional funnel metrics.

The pricing and access models also matter commercially. GPT-6.1 Sol’s one-fifth token price could make high-volume agent workloads economical, while Sign in with ChatGPT gives partners a way to acquire users who already have billing relationships with OpenAI. For enterprises, specialist dots with IT-provisioned credentials and the planned Microsoft Agent 365 governance integration signal that OpenAI is designing these agents for regulated, large-scale deployment rather than only consumer use.

From Chatbot to Agent Platform

The DevDay announcements continue a shift that has been underway at OpenAI across recent product cycles: from a conversational assistant to infrastructure for autonomous and semi-autonomous agents. The plugin upgrades build on the earlier plugin concept and on MCP (Model Context Protocol) connections to external services; the new MCP Events support extends that from on-demand calls to event-driven automation. Dots extend the company’s earlier work on background tasks and memory into persistent, always-on agents with their own compute. The Agents API’s computer-use support follows the industry-wide push toward agents that operate existing software through its interface rather than through purpose-built integrations, and OpenAI now operates the Codex harness on developers’ behalf.

Open Questions After the Keynote

Several details remain unclear or developing. The Decisions API is in limited preview, and OpenAI has promised a broad release without a confirmed date. Which markets qualify for Dots access, and pricing for additional dots or extra speed and monthly output, have not been fully specified. The performance of GPT-6.1 Sol against Astra beyond OpenAI’s ‘near-Astra intelligence’ description is not independently verified, and the source material does not include benchmark data. The claim of 1.2 billion weekly users is OpenAI’s own figure and has not been externally audited. OpenAI’s warning that dots can make mistakes leaves open how reliability and accountability will work in practice, particularly for specialist dots handling procurement or contracting. The Microsoft Agent 365 integration is described as planned rather than shipped.

Rollout Timeline and Developer Next Steps

In the near term, developers can build and submit plugins through the new Plugin Creator flow, integrate plugin extensions with the ChatGPT sidebar, and adopt MCP Events for automation triggers. Businesses in eligible enterprise programs can evaluate the OpenAI Marketplace’s 32 launch partners. The Decisions API’s broad release is the next major milestone to watch, along with text-based dot messaging, expanded dot availability beyond Pro and Business Premium, and the first specialist-dot pilots in procurement, invoice processing, email marketing, support and contracting. The planned Microsoft Agent 365 governance integration will indicate how seriously enterprises can deploy dots at scale.

Key Questions

What are OpenAI Dots?

Dots are persistent, always-on AI agents powered by GPT-6 Astra. Each dot has its own cloud computer and browser, learns a user’s preferences over time, and can manage several projects at once, reaching over 4,000 apps through plugins.

Who can use a dot, and what does it cost?

Pro and Business Premium users in eligible markets get their first dot included in the plan. Chatting with a dot does not count toward usage limits, but tasks it starts in Codex or ChatGPT Work do. Enterprise, Edu and Healthcare customers can use a beta once an admin enables it, which is off by default. Additional dots and extra speed or output will be purchasable later.

What is the Decisions API?

The Decisions API applies GPT-6 Luna to narrow, repetitive decisions. Developers define questions with a finite list of allowed answers and send text or images as context; the API returns a selection that an app can use to classify content, route requests or pick an agent’s next action. It is currently in limited preview.

What is GPT-6.1 Sol?

GPT-6.1 Sol is a new OpenAI model described as offering near-Astra intelligence at one-fifth of Astra’s token prices. OpenAI positioned it as the cost-efficient option in a slate that also includes Ultrafast and Pro 500. Independent benchmark data was not included in the announcement material.

What is Sign in with ChatGPT?

Sign in with ChatGPT lets users bring their existing ChatGPT plan to 16 launch partners. For developers, it enables a business model with a free core app and paid upsells charged through the user’s existing OpenAI plan.

Source: ThorstenMeyerAI.com