Get the token count of a request locally

This code sample demonstrates how to get the token count for a request locally without calling the Count Tokens API.

Explore further

For detailed documentation that includes this code sample, see the following:

• List and count tokens

Code sample

Python

Before trying this sample, follow the Python setup instructions in the Vertex AI quickstart using client libraries. For more information, see the Vertex AI Python API reference documentation.

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from vertexai.preview.tokenization import get_tokenizer_for_model

# Using local tokenzier
tokenizer = get_tokenizer_for_model("gemini-1.5-flash-002")

prompt = "hello world"
response = tokenizer.count_tokens(prompt)
print(f"Prompt Token Count: {response.total_tokens}")
# Example response:
# Prompt Token Count: 2

prompt = ["hello world", "what's the weather today"]
response = tokenizer.count_tokens(prompt)
print(f"Prompt Token Count: {response.total_tokens}")
# Example response:
# Prompt Token Count: 8

What's next

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