What ChatGPT model is free?
As of November 12, 2026, ChatGPT Free includes GPT-5.6 Luna. Free users can also use Think for harder questions. OpenAI says Think is available in the ChatGPT mobile app and is rolling out on the web; check your account to see what’s available to you. (OpenAI Free Tier FAQ; models in ChatGPT)
Free is intended for personal ChatGPT use. Everyday text chats are available, while tools have separate usage limits. OpenAI’s Help Center pages reviewed here don’t specify a separate Think allowance or guarantee what happens when a Think limit is reached. Check ChatGPT for the options and reset timing shown for your account. (OpenAI Free Tier FAQ)
Does free ChatGPT include free API access?
No—not as an included benefit of the Free plan. ChatGPT and the API Platform have separate billing. A free ChatGPT account does not itself provide free API usage or turn ChatGPT’s model access into an API allowance. OpenAI’s subscription-linked API credit benefit is limited to eligible paid Pro and Business subscribers; Free plans and free trials are not eligible. (OpenAI billing information; API credit eligibility)
For a production app, budget API usage separately. The API is billed according to the model and usage; for text models, the pricing page lists separate input-token and output-token rates. For example, the cost-sensitive GPT-6 Luna API model is listed at $0.10 per 1 million input tokens and $0.50 per 1 million output tokens at standard rates. That is a different API model name from the GPT-5.6 Luna available in ChatGPT Free. (OpenAI API pricing)
Worked estimate: Suppose an application processes 1 million input tokens and generates 200,000 output tokens using GPT-6 Luna at standard rates. The estimate is $0.10 + $0.10 = $0.20. This example includes only those token charges; tools and other billable features can add cost. Check the API pricing page when setting a budget because rates and available models can change. (OpenAI API pricing)
What limits matter on ChatGPT Free?
OpenAI says everyday text chats are unlimited, subject to abuse-prevention safeguards. That does not mean every tool is unlimited: tool access has separate usage limits. The Free Tier FAQ does not give one fixed quota for every feature; it says available limits can change. (OpenAI Free Tier FAQ)
ChatGPT displays applicable limit and reset information in the product. The cited Help Center information does not establish a separate Think quota or guarantee what happens after a Think limit, so check the notice shown in your account. (OpenAI Free Tier FAQ)
Which option fits your use?
- Use ChatGPT Free if you want to chat in the ChatGPT app or website and its current model, Think availability, and tool limits suit your needs.
- Budget for the API if you are building an application or service that sends model requests programmatically. Estimate input and output token use, account for tools or other billable features, and set spend controls.
- Don’t treat the two as interchangeable: a ChatGPT plan pays for ChatGPT access; API usage is a separate product with separate billing. (OpenAI billing information)
Sources
GPT-6 and other models in ChatGPT
Managing billing for ChatGPT and the API platform