MARZAI Context Window Calculator
Check how much of a model's context window your prompt will use.
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About this tool
Paste your prompt to see its token count against a reference table of context window limits for major AI models, showing how much headroom remains.
How to use
- Paste your prompt or document.
- Select a model from the reference table.
- View your token count against that model's context window, with remaining headroom.
FAQ
Where do the context window numbers come from?
From publicly documented model specifications, maintained as a static reference table and updated as providers release new models.
Does context window include both input and output?
For most models, yes — the context window is shared between your prompt and the model's response, which this tool accounts for.