With most AI chatbots and AI text generators, the best models sit behind a paywall.
The good news: ChatGPT has long been free to use, and the free plan includes limited access to GPT-5.6 Terra inside Codex and ChatGPT Work. Since September 22, 2026, the ChatGPT desktop app also gives Free and Go users GPT-6 Luna. On top of that, there are strong free alternatives, some with internet access included.
In this article, I'll show you three ways to get access without paying a cent.
- ChatGPT Free runs on GPT-5.6 Luna in regular chat and offers limited access to GPT-5.6 Terra inside Codex and ChatGPT Work. Free users get web search, image generation with GPT Image 2, and the GPT Store
- Since September 22, 2026, Free and Go users additionally get GPT-6 Luna in the ChatGPT desktop app. That is not full chat access, though: GPT-6 Sol stays reserved for paid plans starting at Plus, in Work and Codex
- Microsoft Copilot now offers GPT-5.6 models for free with internet access and no registration required
- Perplexity AI offers free AI-powered research with integrated source citations
Why Did the Best ChatGPT Models Used to Cost Money?
Powerful AI models like GPT-4 or GPT-5 require a lot of computing power and are significantly more expensive to operate than older models like GPT-3.5.
However, a lot has changed since 2024: Prices have dropped massively, and OpenAI now gives free users limited access to GPT-5.6 Terra inside Codex and ChatGPT Work.
Here's a quick overview of API costs for a 10,000-word blog article:
- GPT-5 nano: approx. $0.01
- GPT-5: approx. $0.10
- GPT-4.1: approx. $0.20
With millions or billions of generated words per month, this can quickly become expensive for tool and app providers.
Before we dive in, here are the three options side by side.
| Feature | ChatGPT | Microsoft Copilot | Perplexity |
|---|---|---|---|
| Free modelChatGPT: GPT-5.6 Luna in chat, GPT-5.6 Terra limited in Codex and ChatGPT Work, GPT-6 Luna in the desktop app | GPT-5.6/GPT-6 Luna (Terra limited in Codex and Work) | GPT-4-class models | GPT-4 + own models |
| Internet access | Yes | Yes | Yes |
| Source citationsChatGPT: Browsing Mode only | Partial | Yes | Yes |
| Limits for free users | limited daily message quota | up to 300 responses/day with account | Pro Search multiple times daily with account |
1. ChatGPT
GPT-4 was always paid in ChatGPT since its introduction in March 2023. Only with ChatGPT Plus ($20/month) or higher plans could you access it.
However, this has fundamentally changed since then:
In regular ChatGPT chat, GPT-5.6 Luna is the default model for Free users. Free and Go users also get limited access to GPT-5.6 Terra inside Codex and ChatGPT Work. GPT-5.6 Sol in chat starts with Plus. OpenAI says GPT-6 Astra is available to Plus users in Work and Codex, while GPT-6 Pro in chat starts with Pro. The GPT-5.6 family (Sol, Terra, Luna) has been generally available since July 9, 2026 and covers ChatGPT (Plus/Pro/Business/Enterprise), ChatGPT Work, Codex, and the API.
However:
Access to Codex and ChatGPT Work is limited, though. When exceeded, ChatGPT automatically switches to a smaller model.
This means:
ChatGPT offers GPT-5.6 Luna for free in chat, plus limited access to GPT-5.6 Terra in Codex and ChatGPT Work.
Since September 22, 2026, Free and Go also get the ChatGPT desktop app with GPT-6 Luna. The new GPT-6 Sol and GPT-6 Luna models in ChatGPT Work and Codex remain reserved for paid plans starting at Plus, just like GPT-5.6 Sol already was.
| Plan | Price | Features | Best for |
|---|---|---|---|
| FreeGPT-5.6 Luna in chat, with Terra limited in Codex and ChatGPT Work. | $0/month | GPT-5.6 Luna as the default chat model GPT-6 Luna additionally in the desktop app GPT-5.6 Terra with limited access in Codex and ChatGPT Work Web search, image generation with GPT Image 2, and the GPT Store Limited daily quota, then falls back to a smaller model GPT-5.6 Sol in chat and GPT-6 Astra in Work and Codex | For occasional use |
| GoMore messages at a lower price, with ads. | $8/month | Significantly more messages than Free GPT-5.6 Luna in chat, GPT-6 Luna in the desktop app GPT-5 Thinking and Deep Research | Budget option for regular users |
| PlusGPT-5.6 Sol in chat and GPT-6 Astra in Work and Codex. | $20/month | GPT-5.6 Sol in chat, GPT-6 Astra in Work and Codex 25 Deep Research queries per month Audio/video mode, custom GPTs, ChatGPT Agent | For intensive and professional use |
2. Microsoft Copilot
Microsoft Copilot (formerly "Bing Chat") is currently one of the best ChatGPT alternatives. And for good reason:
Copilot now uses GPT-5.6 models from OpenAI as well, free to use in Copilot chat. You also get internet access and image generation.
It also offers access to image generation and various plugins.
The best part:
It's completely free and usable without registration. It works in the browser and as an app for Android and iOS.
It also offers generous usage limits. Microsoft no longer publishes a fixed daily cap for text chats; Copilot is already usable without a Microsoft account, and signing in adds chat history, image generation, and longer conversations.
3. Perplexity.ai
Perplexity is an AI search engine that represents a great and free alternative to ChatGPT or Bing Chat.
It's particularly well suited for conducting intensive internet research on a topic.
Similar to Bing Chat or ChatGPT in Browsing Mode, the sources of generated responses are cited as footnote numbers:
Below the response, similar questions or topics are displayed, and you have the option to ask follow-up questions. By clicking on the underlined links in the response, you can also explore topics further.
I also find the new "Copilot" feature brilliant. Similar to AutoGPT or BabyAGI, it doesn't just give AI-generated responses but executes more complex workflows to answer a question or perform an action for you:
If you're planning a trip, for example, it asks you intermediate questions to find the best possible travel route for you:
Perplexity uses its own Sonar model (built on Llama 3.3 70B) by default for response generation, tuned for fast web research with source citations. If you create an account with Perplexity, you can use Pro Search multiple times daily for free.
Usage: How Popular Are These Tools Really?
For context: according to Similarweb data (May 2026), ChatGPT accounted for 52.7% of global AI chatbot web traffic. Microsoft Copilot came in at 2.0%, Perplexity at 1.3%.
Frequently Asked Questions About Using ChatGPT for Free
The free limits are noticeable, but sufficient for many users:
- GPT-5.6 Luna in chat, plus limited access to GPT-5.6 Terra inside Codex and ChatGPT Work, and GPT-6 Luna additionally in the desktop app
- When exceeded, automatic switch to a smaller model
- Limited access to advanced features like image generation with GPT Image 2
- Frequent restrictions during peak times
For occasional use, this is sufficient; for intensive use, ChatGPT Plus is recommended.
