OpenAI · SELECTED HISTORY
OpenAI model history: selected releases from GPT-2 to GPT-4o
These five snapshots follow a change in how people interacted with models: continue a passage, supply examples, hold a conversation, then ask about images and audio.
Coverage
Selected releases from 2019 to May 2024. Later OpenAI releases are not covered in this source reviewed timeline.
GPT-2
A glimpse of fluent text generation
Original sourceGPT-3
One model, many language tasks
Original sourceChatGPT (GPT-3.5)
Conversational AI reaches a wider audience
Original sourceGPT-4
A step forward in reasoning and images
Original sourceGPT-4o
Text, vision and audio come together
Original source
How to read a release timeline
A paper, preview and public rollout can have different dates. These entries preserve that distinction. Release dates show when something was announced or made available, not how far ahead one company is overall.