AI model

GPT (ChatGPT): what it is, what it costs, and who it suits (2026)

GPT is OpenAI's family of AI models. Most people use it through the ChatGPT app.

Research-based, not tested. Written from official pages and help docs (last checked Oct 15, 2026). We haven't run our own tests of this yet, so treat it as an explainer, not a verdict. How we test

In one sentence

The best-known AI chatbot: a strong all-rounder with a generous free plan and the biggest set of extra features.

Latest models (last checked Oct 15, 2026)

Current flagship: GPT-6 Astra (most intelligent). Newest: GPT-6.1 Sol (Sep 29). Free ChatGPT uses GPT-6 Luna.

Free vs paid (as of Oct 2026)

PlanPriceWhat you get
Free$0GPT-6 (the “Luna” model) for everyday chats; limited images, voice and uploads
Go$8/month (US)More messages, uploads, images and memory. OpenAI says this plan may include ads
Plus$20/monthAdvanced reasoning models (GPT-6 Sol, GPT-6.1 Sol, GPT-6 Astra), deep research, projects, custom GPTs, Codex
Pro$100, $200 or $500/monthThree usage tiers, the strongest “Pro” reasoning, Dot (an always-on agent); billed monthly only

Free option: Unlimited everyday text chats with GPT-6 (OpenAI caps abuse), plus limited uploads, image creation, voice chats and deep research.

What it's good at

  • Everyday writing, explaining and brainstorming
  • Image creation and voice chat built in
  • Huge range of extras: deep research, projects, custom GPTs, coding (Codex)

Keep in mind

  • Free plan has a smaller memory for long documents (about 12 pages of text per message, per OpenAI)
  • The Go plan may show ads
  • Many model names (Luna, Sol, Astra…) can be confusing

Where you'll find it

Last checked Oct 15, 2026. Model names change fast. Names and prices here are as of Oct 2026 and come from the sources at the bottom of the page.

See also: AI models explained · Which AI model should I use? · Best free AI models

Sources

Prices and plans change often. Always confirm on the official site before you buy.