After recently achieving a milestone with one million members, we’ve been talking about the history of this community in the Lounge. I also wanted to share what our resident AI bot had to say about the history of this place.
Here’s to many more great years to come!
Paul — here’s the forum archaeology version.
TL;DR: this community started as a small, semi-insider GPT-3 beta builder clubhouse in 2021, then went through successive shockwaves: Codex, DALL·E 2, ChatGPT, GPT-4 / plugins / GPTs, Assistants / RAG, GPT-4o / realtime / structured outputs, and now Responses API / Agents / Codex / Apps SDK / GPT-5.x. Each wave brought a different kind of user.
Caveat: this is based on visible public forum history, not private analytics.
1. 2021: the GPT-3 beta campfire
The earliest visible layer feels small, experimental, and builder-heavy. People were not asking “how do I build an agentic RAG voice app?” yet. They were asking things like:
- “Will GPT-3 become public?”
- “How do I get access?”
- “Can I share outputs on social media?”
- “How do I prompt it to do X?”
- “Can I build this with Bubble / Android / REST?”
- “How much will this cost?”
One fun fossil: your own thread, AI RPG Tabletop Generators and DND Backstory Generator+ LitRPG Adventures Review, is one of the old visible community artifacts. It captures the original spirit well: indie builder, creative writing/game use case, product experimentation, and a long-running project thread.
Other 2021 signals:
- Will GPT-3 get a public release?
- Building GPT3 apps with Bubble
- Sharing outputs on social media?
- Elementary Algebra Word Problem Prompt
The community then was mostly:
“I got access to this strange powerful API. What can I make with it, and what am I allowed to do?”
The terminology was different too. People talked about engines, davinci, curie, prompt examples, temperature, completions, and beta access. “Prompt engineering” was emerging, but not yet the giant discipline it later became.
Late 2021: access opens up
A major transition point was the “no more waitlist” era. See GPT-3 new FREE public access, where a staff reply says there was no more GPT-3 waitlist, though Codex still required one.
That was probably the first big broadening of the community: from beta cohort to wider developer adoption.
2. 2021 Codex wave: hackers, IDEs, and code toys
Codex created a distinct subculture before ChatGPT coding became mainstream.
Threads like these show the vibe:
- Who got access to CodeX
- I got access to codex
- Python IDE powered by Codex
- Emacs Package for Codex
- Codex Plugin for Zsh
- Codex Generates READMES
This wave brought in more developer-tool people: editors, CLI tools, autocomplete, codebase Q&A, README generation, toy IDEs, coding challenges.
It foreshadowed what later became much bigger with Copilot, ChatGPT coding, Codex CLI, and coding agents.
3. 2022: productization, embeddings, fine-tuning, DALL·E, then ChatGPT
Early 2022 looks like the “let’s turn this into actual products” phase.
People were exploring:
- embeddings for search/recommendation
- fine-tuning
- document Q&A
- summarization
- classification
- wrappers/libraries
- app integrations
Examples:
- Using OpenAI Embeddings for article recommendations
- Five rules for finetuning from my experience, observations, and consulting
- Trying to create a visualization for embeddings
This is basically the pre-RAG RAG era. People were already trying to ask questions over documents and databases before “RAG” became the standard buzzword.
DALL·E 2 brought the artist / creator wave
Spring 2022 changed the tone. DALL·E 2 hype brought artists, creators, prompt stylists, copyright/safety questions, and waitlist energy.
Examples:
- DALLE-2 Early Access… I am not a robot! (I think!)
- Who already has access to DALL-E 2?
- DALLE-2 style tag tutorial
- Can I ask for DALLE2 prompts to people in Instagram and post them in my story?
This was one of the first times the forum’s center of gravity expanded beyond text/API developers into creative AI users.
Late 2022: ChatGPT tsunami
Then ChatGPT arrived, and the forum changed permanently.
The December 2022 threads already show the immediate confusion:
- Can ChatGPT respond with citations?
- Do I have to add a disclaimer to text taken from ChatGPT?
- Strategies for ChatGPT prompting
- ChatGPT error in body stream
This was the big demographic shift. The forum went from mostly developers/builders to a mixture of:
- API developers
- ChatGPT users
- students
- writers
- entrepreneurs
- people with account/support issues
- people trying to reverse-engineer “the ChatGPT API”
- people asking product questions in developer categories
That “API forum accidentally becomes ChatGPT support desk” pattern persisted for years.
4. 2023: GPT-4, plugins, GPTs, Assistants, and marketplace thinking
2023 was probably the biggest identity crisis year for the community.
The major waves were:
GPT-3.5 / GPT-4 API developers
The old completions mindset shifted toward chat completions, system messages, function calling, JSON-ish outputs, cost/latency/rate-limit discussions, and GPT-4 access.
ChatGPT plugin builders
The plugin era brought a very different user type: builders trying to get manifests, OpenAPI schemas, auth, review, plugin visibility, and marketplace placement right.
The forum still carries this fossil record in categories/tags like:
- Plugin store
- Plugins / Actions builders
plugin-developmentchatgpt-pluginactions
GPT builders
After GPTs launched, another group arrived: people less interested in raw API calls and more interested in building packaged ChatGPT experiences. The current GPT builders category is basically a remnant of that wave.
Assistants API / RAG builders
Late 2023 into 2024 brought Assistants API, files, retrieval, tools, Code Interpreter-style workflows, and eventually vector stores/file search. That created a huge “how do I build a custom assistant over my data?” wave.
The assistants-api tag becoming one of the large tags on the site says a lot.
5. 2024: production API, multimodal, structured outputs, realtime
By 2024 the forum feels less like “wow, look at this demo” and more like:
“I’m shipping this. Why is it slow? Why is JSON invalid? Why is billing/rate-limit weird? Which model is cheaper? How do I migrate?”
The official Announcements category becomes more important around here.
Big platform moments visible in forum announcements include:
- Batch API is now available
- Introducing Structured Outputs
- Model Distillation including Evals and Stored Completions
- Audio support in the Chat Completions API
- New Realtime API voices and cache pricing
The user wave here was more “serious application developers”:
- production RAG
- structured data extraction
- customer support bots
- voice agents
- file processing
- tool calling
- evals
- latency/cost optimization
- billing and usage troubleshooting
This is also when the forum’s Bugs, Support, and Deprecations patterns became more prominent. Not because people stopped building cool things, but because more people were relying on the platform in production.
6. 2025: Responses API, Agents, Codex comeback, image/API expansion
2025 looks like the “agent platform consolidation” year.
Major announcements:
- New tools for building agents: Responses API, web search, file search, computer use, and Agents SDK
- Introducing the Responses API
- Direct PDF file input now supported in the API
- New audio models in the API + tools for voice agents
- This week’s launches: o3, o4-mini, GPT-4.1, and Codex CLI
- New GPT Image Model in the API
- Introducing support for remote MCP servers, image generation, Code Interpreter, and more in the Responses API
- Deep research in the API, webhooks, and web search with o3
This shifted the center of gravity from:
“Call a model and get text back”
to:
“Orchestrate tools, files, search, computer use, voice, image, code, and agents.”
The big community wave here was agent builders:
- people wiring web search/file search/tools together
- people migrating from Assistants API
- MCP experimenters
- voice/realtime developers
- Codex CLI users
- coding-agent builders
- teams building internal automation
The Assistants API sunset announcement is also historically important:
That created a migration wave that still affects “now.”
7. 2026 so far: GPT-5.x, Codex, Apps SDK, open-ish ecosystems
By 2026, the community is no longer one coherent crowd. It is several overlapping communities sharing a Discourse:
- API platform developers
- ChatGPT app/tool builders
- Codex users
- Codex CLI users
- agent developers
- voice/realtime developers
- GPT/App SDK builders
- model migration people
- support seekers
- open model / open spec people
Visible 2026-ish landmarks include:
- Open Responses for the Open Source Community
- OpenAI for Developers in 2025
- Introducing GPT-5.4 mini and nano
- The next evolution of the Agents SDK
- Introducing the New Codex for almost everything
- GPT-5.5 is here! Available in the API, Codex and ChatGPT today
The current category map itself tells the history: API, Community, and Prompting are the old bones; ChatGPT, GPT builders, Plugins / Actions, Codex, Codex CLI, ChatGPT Apps SDK, Open Models, Bugs, and Deprecations are the later growth rings.
Waves of users, summarized
| Era | Who arrived | Signature questions |
|---|---|---|
| 2021 GPT-3 beta | prompt hackers, indie makers, early API devs | “How do I get access?” “What can I build?” |
| 2021 Codex | programmers, editor/CLI tinkerers | “Can Codex generate/fix/run code?” |
| Early 2022 product builders | SaaS founders, data/RAG precursors | “How do I fine-tune/search over docs?” |
| 2022 DALL·E | artists, creators, prompt stylists | “Can I get access? Can I share this?” |
| Dec 2022 ChatGPT | everyone | “Is this ChatGPT support? Can it cite sources?” |
| 2023 GPT-4/plugins/GPTs | startups, plugin builders, GPT marketplace people | “How do I build/distribute inside ChatGPT?” |
| Late 2023–2024 Assistants/RAG | enterprise/internal-tool builders | “Files, retrieval, tools, vector stores, cost?” |
| 2024 multimodal/realtime | voice, audio, image, production app devs | “Latency, streaming, structured outputs?” |
| 2025 agents/Responses | agent framework builders | “Responses API, tools, web search, MCP, migration?” |
| 2025–2026 Codex/App SDK/GPT-5.x | coding-agent users, ChatGPT app builders | “How do I build inside/around ChatGPT and Codex?” |
The biggest long-term pattern
The community’s story is basically:
- Access scarcity → “Can I get GPT-3?”
- Prompt craft → “How do I make it behave?”
- Productization → “How do I ship this?”
- Consumer explosion → “ChatGPT changed everything.”
- Platform sprawl → plugins, GPTs, Assistants, Realtime, Agents, Apps, Codex.
- Migration treadmill → Completions → Chat Completions → Assistants → Responses/Agents.
- Production maturity → evals, structured outputs, webhooks, cost, latency, reliability.
- Agentic era → models are no longer just text generators; they are tool-using workers.
So if I had to describe the community in one sentence:
It began as a small GPT-3 beta maker forum, became a ChatGPT-era support-and-builder floodplain, and is now a multi-tribe developer ecosystem centered on agents, tools, Codex, apps, realtime, and constant migration.