ChatGPT in Fall 2026: GPT-6, Work, Plugins, and New Plans
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The ChatGPT app evolves as quickly as the API. If you train colleagues or have written internal procedures around ChatGPT, you need to update several key reference points. This lesson draws on release notes from the OpenAI Help Center and product documentation from learn.chatgpt.com.
GPT-6 in Chat Mode
Since October 7, 2026, Chat mode runs on GPT-6 with a so-called “intelligent” interface: ChatGPT can combine text, visuals, and interactive elements—such as side-by-side comparisons, diagrams, or small calculators—and begin responding while it continues reasoning. Plus, Pro, Business, and Enterprise plans use GPT-6 Sol; Free and Go plans use GPT-6 Luna; and the Pro reasoning option relies on GPT-6 Astra. Regarding older models, GPT-5.5 left ChatGPT, ChatGPT Work, and Codex on October 14.
ChatGPT Work and Codex Now Share Usage
ChatGPT Work is the ChatGPT experience dedicated to deep work: tasks that span time, use tools, and produce deliverables. OpenAI states that usage for ChatGPT Work and Codex is now pooled: same pricing, same credits, and same limits. In the desktop app and on the web, you select the model using the power setting: start from the default, slide toward “Smarter” or “Faster,” or open “Advanced” to choose a specific model, effort level, or speed. GPT-6.1 Sol is available here, but not in Chat mode; for Enterprise and Edu, it remains disabled until an administrator enables it. GPT-6.1 Terra arrived in Work and Codex during the week of October 26 for Plus, Pro, Business, Enterprise, and Edu plans.
The Plans
| Plan | Price listed by OpenAI |
|---|---|
| Free | $0 |
| Go | $8 per month |
| Plus | $20 per month |
| Pro | $100, $200, or $500 per month; Ultrafast mode is reserved for the $500 tier |
| Business | Standard seat at $20 per user per month with annual billing, $25 with monthly billing, minimum two users; Premium seat at $100 annually or $125 monthly, with higher Work and Codex usage limits |
| Enterprise and Edu | Custom pricing |
Since October 28, 2026, eligible Pro and Business subscribers can also claim up to $500 in free API credits per month by linking an API organization they own.
From GPTs to Plugins
This is the change affecting the most users. OpenAI is replacing custom GPTs with plugins. A plugin is a reusable package for a workflow that can contain skills (instructions and reference files explaining how to perform a task) and apps (connections to services). The timeline is now published for all plans: custom GPTs will be retired on December 11, 2026, or February 11, 2027, for FedRAMP spaces and certain Enterprise spaces with an exemption. Personal accounts, from Free to Pro, can no longer create new GPTs.
To migrate, the Migrate to plugin option on the My GPTs page starts from the last published version of the GPT: its instructions become a skill, its knowledge files become reference files, and its connected applications remain apps. Custom actions are not carried over and must be rebuilt, for example using an MCP server. The original GPT becomes read-only, and existing conversations remain accessible after retirement. On the skills side, the dedicated tab in the plugin directory is reserved for Business, Enterprise, Healthcare, and Edu plans.
Another behavioral change follows: with a GPT, you explicitly chose the assistant; with plugins, ChatGPT can also automatically use an installed skill when its description matches your request. Therefore, test your workflows in both cases: explicit selection and ordinary requests. The course Custom GPTs on this site details the migration step by step.
DevDay 2026 Announcements
The DevDay on September 29 introduced several concepts you will encounter in the interface: dots, persistent agents entrusted with ongoing responsibilities that progress between conversations, rolling out gradually; ChatGPT Space and its Pages, for gathering files and documents to collaborate on them; Sites, built within ChatGPT, which can now, in private workspace versions, leverage connected apps from each visitor where enabled; plugin extensions, which add panels, editors, and forms to ChatGPT; MCP Events, allowing ChatGPT to act on events from an MCP server; and Sign in with ChatGPT, to offer login via a ChatGPT account in your applications. Several of these features are rolling out gradually or reserved for specific plans: verify their availability in your workspace before integrating them into internal training. Most recently, ChatGPT Images 2.6 has been available on all plans since November 4.
Your Turn
Update an internal procedure. Take an internal document that explains ChatGPT to your colleagues: a usage guide, training deck, or charter. Identify every mention that has become outdated: model names, custom GPTs, plans and pricing, removed features. For each, write the updated phrasing and the official source that supports it.
Official sources: ChatGPT release notes · Custom GPT retirement and migration FAQ (OpenAI Help Center) · What’s new · Pricing · Moving your custom GPT workflows to plugins (ChatGPT documentation) · DevDay 2026 Recap (OpenAI)
Key Takeaways
- Chat mode has run on GPT-6 since October 7; ChatGPT Work and Codex share usage, credits, and limits
- Plans: Free, Go ($8), Plus ($20), Pro ($100, $200, or $500), Business ($20 or $25 per user, Premium optional), Enterprise and Edu
- Custom GPTs will be retired on December 11, 2026: instructions, files, and apps move to a plugin; actions must be rebuilt
- DevDay September 29: dots, Space and Pages, Sites, plugin extensions, MCP Events, Sign in with ChatGPT