As of November 12, 2026, OpenAI’s Help Center lists ChatGPT agent mode on Plus, with 40 messages per month. The Help Center lists ChatGPT Plus at $20 per month, billed monthly; API usage is separate and is not included with Plus. (OpenAI Help Center: “ChatGPT agent” and “What is ChatGPT Plus?”)
Plus access and the current limit
OpenAI’s Help Center lists agent mode for Plus users in its supported countries and territories. Its current usage guidance gives Plus 40 agent messages per month. Each unique agent invocation counts, including one launched as part of a scheduled task; intermediate clarification or authentication steps do not. (OpenAI Help Center: “ChatGPT agent”)
For access, OpenAI’s July 17, 2025 launch post describes selecting agent mode from the tools dropdown in the composer. That post is marked outdated, so the current interface label or steps may differ; check the tools available in your ChatGPT composer if the option is not where expected. (OpenAI: “Introducing ChatGPT agent”)
OpenAI separately says Plus, Pro, and Business usage allowances will be shared across ChatGPT and Codex “starting in December.” The available wording does not specify the year or explain how that change relates to the separately listed 40-message agent allowance. It therefore does not establish that the 40-message limit changes, or how it would change. (OpenAI Help Center: “Understanding ChatGPT and Codex usage limits”)
What agent mode can do—and a useful boundary
OpenAI’s launch examples include researching competitors and creating a slide deck, navigating websites, running code, and producing editable slides or spreadsheets. These illustrate the kinds of multi-step work the agent was introduced to handle; they are not guarantees that every site, task, or result will work as requested. (OpenAI: “Introducing ChatGPT agent”)
A third-party walkthrough published on July 28, 2025 says users could stop the agent, adjust the prompt, or take over its browser or terminal, and that it asked permission before critical steps. Treat those as the author’s historical description, not a guarantee of current behavior. For user-directed work in ChatGPT, plan to review the agent’s output and respond to any prompts it presents. (DEV Community: “ChatGPT Agent Mode – Full Walkthrough”)
ChatGPT Plus agent mode vs. a production API
A Plus subscription is not an API plan. OpenAI says API usage is billed separately from Plus. OpenAI also documents a beta Agents API for developers building applications with an OpenAI-managed Codex agent that can work across multiple steps and continue in the same session. That is a separate API offering, not an API entitlement included with Plus; the available documentation does not establish feature parity with the ChatGPT agent experience. (OpenAI Help Center: “What is ChatGPT Plus?” and “Agents API (beta) FAQ”)
For the Agents API, model requests use the selected model’s API rates, while OpenAI tools and hosted sandboxes have applicable tool and container rates. Production use therefore requires separate API access, implementation, and cost planning; the Plus fee does not cover those API charges. (OpenAI Help Center: “Agents API (beta) FAQ”)
Bottom line: Choose Plus if you want agent mode within ChatGPT and the listed 40-message monthly allowance fits your needs. Evaluate the API separately if your software needs to create and manage agent work programmatically. The announced ChatGPT/Codex allowance change does not, in the available wording, clarify whether or how the listed agent-message limit will change.
Sources
ChatGPT agent — OpenAI Help Center
What is ChatGPT Plus? — OpenAI Help Center
Understanding ChatGPT and Codex usage limits — OpenAI Help Center
Agents API (beta) FAQ — OpenAI Help Center