Count and Compute Tokens

This code sample demonstrates how to get token count and compute tokens for a text prompt.

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

# init local tokenzier
tokenizer = get_tokenizer_for_model("gemini-1.5-flash-001")

# Count Tokens
prompt = "why is the sky blue?"
response = tokenizer.count_tokens(prompt)
print(f"Tokens count: {response.total_tokens}")
# Example response:
#       Tokens count: 6

# Compute Tokens
response = tokenizer.compute_tokens(prompt)
print(f"Tokens list: {response.tokens_info}")
# Example response:
#     Tokens list: [TokensInfo(token_ids=[18177, 603, 573, 8203, 3868, 235336],
#          tokens=[b'why', b' is', b' the', b' sky', b' blue', b'?'], role='user')]

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