AI ToolsetLLM Context Window Calculator
See how much content fits in a model's context window.
GPT-4o Context Capacity
Tokens
128,000
Characters
512,000
Words
96,000
Pages
384
Test Your Content
Paste content to see how much of the context window it uses.
Understanding Context Windows
A context window is the maximum amount of text a model can process in a single request, including both your input and the model's response. Larger context windows allow you to include more reference material, longer conversations, or entire codebases. Gemini Pro leads with a 2M token context (roughly 1.5M words), while GPT-4o and Claude models offer 128K-200K tokens.