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LLM Token Counter Context Window Calculator Prompt Diff Checker LLM JSON Schema Validator Function Calling Schema Generator Prompt Template Linter Embedding Cosine Similarity Calculator Prompt Minifier View all →

Context Window Calculator

Check whether a prompt plus expected completion fits a model context window. If expected output is blank, the tool assumes output ≈ 25% of input tokens and labels that assumption.

Context sizes come from the same versioned model file as the Token Counter. Last-verified date is printed in the JSON result.

Paste or type your content here…

Paste a prompt to see how much of the context window it would use.

Frequently Asked Questions

What is the GPT-4o context window size?

See the model dropdown and the result JSON. Figures are snapshot values with a last-verified date.

Can I reuse a token-counter paste?

The token counter stores a local handoff. You can also share via the URL data parameter.

Context Window Calculator

Frequently Asked Questions

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