Free developer calculator
Context Window Calculator
Check whether your input fits a model and estimate how much context remains for output.
Your text is processed locally in your browser and is not stored.
Fits in the context window
0.0% of GPT-5.6 Sol's context window
Estimated input
17
Remaining tokens
1,049,983
Approx. output allowance
128,000
Context window
1,050,000
Pricing last verified: Aug 7, 2026Official source
Context is shared by input and output
A model's context window must hold your instructions, conversation, documents, tool results, and generated output. The available output allowance is therefore the smaller of the remaining context and the model's maximum output limit.