ChatGPT’s context window depends on your plan and mode: GPT Instant has 27K tokens on Free, 54K on Go and Plus, and 128K on Pro, while reasoning models have 256K tokens on Go and Plus and 400K on Pro, according to OpenAI’s ChatGPT pricing page.
As of November 9, 2026, OpenAI lists the Free plan’s reasoning window only as “varies.” These are total windows. OpenAI estimates the most text you can enter at about 12 pages in GPT Instant on Free, about 40 pages on Go and Plus, and about 250 pages on Pro. With reasoning models, the estimate is about 320 pages on Go and Plus and about 680 pages on Pro.
The space for your own text is smaller than the total because the same window also holds system instructions, tools and personality settings, saved memories if they are turned on, and the model’s reasoning and reply. OpenAI calls the input figures approximations that can change with the features in use. Moving from Go to Plus does not add context; Pro is the only consumer plan that raises both windows.
Related: ChatGPT usage limits: how much can you use on each plan?, ChatGPT Plus vs Pro: what is the difference? and What is the Claude context window?
Source: OpenAI, ChatGPT Plans and Pricing
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