Tokemon

A unified Python library for counting tokens across multiple LLM providers. Tokemon provides a simple, consistent interface to count tokens for OpenAI, Anthropic, Google AI, and xAI models.

Features

• Unified API for token counting across multiple providers
• Support for both synchronous and asynchronous operations
• Dynamic model discovery via provider APIs
• Type-safe responses with dataclass

Installation

pip install tokemon

Quick Start

from tokemon import tokemon, ProviderName, Mode

# Create a tokenizer for your preferred provider
tokenizer = tokemon(
    model="gpt-4o",
    provider=ProviderName.OPENAI.value,
    mode=Mode.SYNC,
)

# Count tokens
response = tokenizer.count_tokens("Hello, world!")
print(response.input_tokens)  # Number of tokens
print(response.model)         # Model name
print(response.provider)      # Provider name

Usage by Provider

OpenAI

OpenAI tokenization uses tiktoken and works offline without an API key.

from tokemon import tokemon, ProviderName, Mode

tokenizer = tokemon(
    model="gpt-4o",
    provider=ProviderName.OPENAI.value,
    mode=Mode.SYNC,
)

response = tokenizer.count_tokens("Hello, world!")
print(f"Token count: {response.input_tokens}")

Anthropic

Note: Set the ANTHROPIC_API_KEY environment variable before using the Anthropic provider.

export ANTHROPIC_API_KEY="your-api-key"

from tokemon import tokemon, ProviderName, Mode

tokenizer = tokemon(
    model="claude-sonnet-4-5",
    provider=ProviderName.ANTHROPIC.value,
    mode=Mode.SYNC,
)

response = tokenizer.count_tokens("Hello, world!")
print(f"Token count: {response.input_tokens}")

Async example:

import asyncio
from tokemon import tokemon, ProviderName, Mode

async def main():
    tokenizer = tokemon(
        model="claude-sonnet-4-5",
        provider=ProviderName.ANTHROPIC.value,
        mode=Mode.ASYNC,
    )
    response = await tokenizer.count_tokens("Hello, world!")
    print(f"Token count: {response.input_tokens}")

asyncio.run(main())

Google AI (Gemini)

Note: Set the GEMINI_API_KEY environment variable before using the Google AI provider.

export GEMINI_API_KEY="your-api-key"

from tokemon import tokemon, ProviderName, Mode

tokenizer = tokemon(
    model="gemini-2.5-flash",
    provider=ProviderName.GOOGLE.value,
    mode=Mode.SYNC,
)

response = tokenizer.count_tokens("Hello, world!")
print(f"Token count: {response.input_tokens}")

Async example:

import asyncio
from tokemon import tokemon, ProviderName, Mode

async def main():
    tokenizer = tokemon(
        model="gemini-2.5-flash",
        provider=ProviderName.GOOGLE.value,
        mode=Mode.ASYNC,
    )
    response = await tokenizer.count_tokens("Hello, world!")
    print(f"Token count: {response.input_tokens}")

asyncio.run(main())

xAI (Grok)

Note: Set the XAI_API_KEY environment variable before using the xAI provider.

export XAI_API_KEY="your-api-key"

from tokemon import tokemon, ProviderName, Mode

tokenizer = tokemon(
    model="grok-3",
    provider=ProviderName.XAI.value,
    mode=Mode.SYNC,
)

response = tokenizer.count_tokens("Hello, world!")
print(f"Token count: {response.input_tokens}")

Async example:

import asyncio
from tokemon import tokemon, ProviderName, Mode

async def main():
    tokenizer = tokemon(
        model="grok-3",
        provider=ProviderName.XAI.value,
        mode=Mode.ASYNC,
    )
    response = await tokenizer.count_tokens("Hello, world!")
    print(f"Token count: {response.input_tokens}")

asyncio.run(main())

Listing Available Models

Use tokemon_models() to discover models supported by each provider at runtime:

from tokemon import tokemon_models, ProviderName, Mode

# Get a provider instance
provider = tokemon_models(
    provider=ProviderName.OPENAI.value,
    mode=Mode.SYNC,
)

# List available models
models = provider.models()
print(models)

Async example:

import asyncio
from tokemon import tokemon_models, ProviderName, Mode

async def main():
    provider = tokemon_models(
        provider=ProviderName.ANTHROPIC.value,
        mode=Mode.ASYNC,
    )
    models = await provider.models()
    print(models)

asyncio.run(main())

Response Object

The count_tokens method returns a TokenizerResponse dataclass:

@dataclass
class TokenizerResponse:
    input_tokens: int | None  # Number of tokens in the input
    model: str                # Model name used for tokenization
    provider: str             # Provider name (openai, anthropic, google, xai)

Requirements

• Python >= 3.10

License

MIT License