“ChatGPT Omni” almost always means GPT-4o, the model OpenAI announced in May 2024. The “o” in GPT-4o stands for “omni” because it was built to handle text, images and audio in a single model instead of passing between separate ones.
Omni AI is something else: an independent app, not made by OpenAI, that lets you chat with OpenAI's GPT models alongside Claude, Gemini, Grok and DeepSeek in one conversation. The shared word causes a lot of confusion, so this page explains both and helps you find the one you were looking for.
GPT-4o (“ChatGPT Omni”) vs Omni AI at a glance
| GPT-4o (“omni”) | Omni AI | |
|---|---|---|
| What it is | An AI model made by OpenAI | An app that gives you access to many AI models |
| Made by | OpenAI | Bridge Softwares, an independent developer |
| Where you use it | Inside OpenAI's products and API | iOS, Android and omni-chat.app |
| Models | One model | OpenAI GPT models plus Claude, Gemini, Grok, DeepSeek and more |
| Image and video generation | Through ChatGPT's own tools | Built in, including AI video |
What does the “o” in GPT-4o mean?
OpenAI named GPT-4o for “omni”. Earlier ChatGPT voice features chained three models together: one to transcribe speech, one to write the answer and one to read it aloud. GPT-4o was trained to take in and produce text, audio and images directly, which made voice conversations faster and let it reason about what it sees in a photo.
When people search for “ChatGPT omni”, “GPT omni” or “omni GPT”, this is usually the model they mean. OpenAI has released newer GPT models since then, and which models ChatGPT offers changes over time, so check OpenAI's own site for what is available in ChatGPT today.
What is Omni AI?
Omni AI is an AI assistant app for iOS, Android and the web. Instead of one company's models, it puts several labs' models in one chat: you can ask OpenAI's GPT, then switch to Claude or Gemini in the same conversation and compare the answers.
It also generates images and videos and can search the web with citations. The free plan includes a daily allowance on the free-tier models; Pro unlocks every premium model, including OpenAI's latest GPT models, for about half the price of ChatGPT Plus.
Is Omni AI affiliated with OpenAI or ChatGPT?
No. Omni AI is not made, sponsored or endorsed by OpenAI, and it is not ChatGPT. It connects to OpenAI's models the same way it connects to Anthropic's, Google's and xAI's: as one of several AI providers. ChatGPT and GPT-4o are trademarks of OpenAI.
Which one should you use?
If you want OpenAI's own app, its voice mode and features such as custom GPTs, use ChatGPT from OpenAI.
If you want GPT and other leading models side by side, or you would rather pay for one app than several AI subscriptions, Omni AI is built for that.
Use GPT, Claude and Gemini in one app
Omni AI is free to download on iOS and Android. Start on the free plan and upgrade only if you need the premium models.
Frequently asked questions
What is ChatGPT Omni?
“ChatGPT Omni” usually refers to GPT-4o, an OpenAI model announced in May 2024. The “o” stands for “omni” because the model handles text, images and audio in one network.
Is Omni AI the same as ChatGPT Omni or GPT-4o?
No. GPT-4o is a model made by OpenAI. Omni AI is an independent app from Bridge Softwares that lets you use OpenAI's GPT models together with Claude, Gemini, Grok and DeepSeek. It is not affiliated with OpenAI.
Can I use GPT models in Omni AI?
Yes. Omni AI includes OpenAI GPT models alongside models from other labs. The free plan includes a daily allowance on the free-tier models, and Pro unlocks every premium model, including OpenAI's latest.
Is Omni AI free?
Omni AI is free to download, and the free plan includes a daily message allowance on the free-tier models. Pro costs about $9.99 a month or $59.99 a year and unlocks every premium model, plus image and video generation.