OpenAI announces ChatGPT plugins

Background

A language model produces text by predicting what comes next, drawing on patterns learned from its training data. On its own it cannot open a web page, run a program, or read a file the user has just uploaded; it works only with what is in the conversation. That creates two familiar problems. Ask about something that happened after the model's training data was collected and the answer may be stale or invented; give it a long calculation and the result may be wrong. One way around this is to let the model call outside tools — small pieces of software that fetch a page, do a computation, or talk to another service — and pass the results back to the model. The plugins OpenAI announced for ChatGPT follow this approach.

The announcement

On 23 March 2023, OpenAI announced ChatGPT plugins^[1][3]. The announcement described them as connecting ChatGPT to third-party services and to the web^[1][3]. OpenAI characterised plugins as tools designed specifically for language models, with safety as a core principle in their design^[4]. The framing matters: instead of trying to build every capability into the model itself, the model is given a way to reach services and information that live outside the conversation.

What plugins did

OpenAI described three broad uses for plugins: access to up-to-date information, running computations, and using third-party services^[4]. Among the plugins presented were web browsing and code interpretation^[1]. Browsing addresses the boundary set by training data — the model can look something up rather than recall it. Code interpretation works differently: instead of producing an answer from memory, the model hands a problem to a program and gets back the computed result. In both cases the model stays the part of the system that reads the question and writes the answer, while the plugin supplies the fact or performs the action.

A gradual rollout

Plugins were not opened to everyone at once. They were rolled out gradually, first to a small set of users, then to plugin developers, and later to API users after an alpha period^[4]. Browsing arrived in stages under its own name: "GPT-3.5 with Browsing" (alpha) was introduced on 10 April 2023 and reached ChatGPT Plus users on 27 April 2023^[2].

Browsing as a product feature, and Custom GPTs

Web access was later folded into the product itself: on 27 September 2023, ChatGPT gained web access with current information^[1]. Then, on 6 November 2023, OpenAI introduced Custom GPTs, which later took over the role that plugins had played^[1].

Why it matters

Before plugins, a chat assistant was a closed system: everything it said came from the model and the conversation. After plugins, the same assistant could be a hub that calls other software — a page fetcher, a calculator, a third-party service — and weaves the results into its reply. The announcement made that pattern a visible part of a widely used product rather than an idea confined to research. It also set the shape of later work: a language model as the reasoning layer that decides what to look up or run, with external tools supplying facts and actions, and the model's own knowledge no longer the only source of an answer^[1][4].