TextGPT

TextGPT takes a messaging-first approach to AI: rather than a chat UI in a browser or an app, you interact with ChatGPT through SMS. You send a question as a text message and get the answer back in the same thread. The service runs on OpenAI's GPT-5.6 family, and you can choose between three model tiers — Luna for the fastest and lightest responses, Terra as the balanced default, and Sol for deeper reasoning on harder problems. All three have internet access through OpenAI's web search.

Beyond text answers, TextGPT can generate and edit images from a text message. You start a message with an emoji marker and describe what you want, and the picture comes back as an SMS. You can also send a photo to the service and ask questions about it, or request an edit such as changing the sky color or removing a background.

Pricing is credit-based, sold in two packs, and costs are split between the messaging itself — billed per SMS segment, which is how phone networks charge — and the AI's work, billed by tokens at the rate of your selected tier. The default Luna tier is roughly a tenth the cost of Terra. Turning up thinking time increases cost, and web lookups are charged separately per search. Images are billed according to the quality level you choose in your account page. Memory is optional: if it is disabled, messages are not stored in the database, and you can delete messages at any time.