AI Context Window Calculator
Running out of memory? Use this tool to estimate if your document or codebase will fit into the context window of your chosen AI model.
What is a context window in AI?
The context window is the maximum number of tokens an AI model can "remember" or process at one time. If your conversation or document exceeds this limit, the model will forget the earliest parts of the input.
How many tokens are in a page of text?
On average, one page of single-spaced text contains about 500 words, which translates to roughly 650 to 750 tokens.
What happens if I exceed the context window?
When you exceed the limit, the API will either return an error or truncate the earliest tokens. This is often called "sliding window" context management.
Which AI model has the largest context window?
Currently, Gemini 1.5 Pro has one of the largest context windows, supporting up to 2 million tokens. For comparison, Claude 3 supports 200,000, and GPT-4o supports 128,000.