Google Gemini · API counting required
Gemini 3.5 Flash Token Counter
Gemini 3.5 Flash uses Google's tokenizer. Use the Gemini API countTokens method for an exact model-specific count; the local explorer below is for comparison only.
Accuracy note
Reference page. Google does not provide the exact Gemini tokenizer through this browser tool. Use Gemini API countTokens for production decisions.
Frequently asked questions
How do I count Gemini 3.5 Flash tokens exactly?
Call Google's countTokens method with the same model and content structure you plan to send to generateContent.
Is the local count exact for Gemini?
No. The local explorer uses a selectable comparison encoding and must not be treated as Gemini billing usage.
What is the Gemini 3.5 Flash context window?
Google documents an input limit of 1,048,576 tokens and an output limit of 65,536 tokens.