litellm-mirror/docs/my-website/docs/token_usage.md

Completion Token Usage & Cost

By default LiteLLM returns token usage in all completion requests (See here)

However, we also expose 3 public helper functions to calculate token usage across providers:

• token_counter: This returns the number of tokens for a given input - it uses the tokenizer based on the model, and defaults to tiktoken if no model-specific tokenizer is available.

• cost_per_token: This returns the cost (in USD) for prompt (input) and completion (output) tokens. It utilizes our model_cost map which can be found in __init__.py and also as a community resource.

• completion_cost: This returns the overall cost (in USD) for a given LLM API Call. It combines token_counter and cost_per_token to return the cost for that query (counting both cost of input and output).

Example Usage

1. token_counter

from litellm import token_counter

messages = [{"user": "role", "content": "Hey, how's it going"}]
print(token_counter(model="gpt-3.5-turbo", messages=messages))

2. cost_per_token

from litellm import cost_per_token

prompt_tokens =  5
completion_tokens = 10
prompt_tokens_cost_usd_dollar, completion_tokens_cost_usd_dollar = cost_per_token(model="gpt-3.5-turbo", prompt_tokens=prompt_tokens, completion_tokens=completion_tokens))

print(prompt_tokens_cost_usd_dollar, completion_tokens_cost_usd_dollar)

3. completion_cost Accepts a litellm.completion() response and return a float of cost for the completion call

from litellm import completion, completion_cost

response = completion(
            model="together_ai/togethercomputer/llama-2-70b-chat",
            messages=messages,
            request_timeout=200,
        )
# pass your response from completion to completion_cost
cost = completion_cost(completion_response=response)
formatted_string = f"${float(cost):.10f}"
print(formatted_string)