litellm/docs/my-website/docs/completion/usage.md

Usage

LiteLLM returns the OpenAI compatible usage object across all providers.

"usage": {
    "prompt_tokens": int,
    "completion_tokens": int,
    "total_tokens": int
  }

Quick Start

from litellm import completion
import os

## set ENV variables
os.environ["OPENAI_API_KEY"] = "your-api-key"

response = completion(
  model="gpt-3.5-turbo",
  messages=[{ "content": "Hello, how are you?","role": "user"}]
)

print(response.usage)

Note: LiteLLM supports endpoint bridging—if a model does not natively support a requested endpoint, LiteLLM will automatically route the call to the correct supported endpoint (such as bridging /chat/completions to /responses or vice versa) based on the model's modeset in model_prices_and_context_window.

Streaming Usage

if stream_options={"include_usage": True} is set, an additional chunk will be streamed before the data: [DONE] message. The usage field on this chunk shows the token usage statistics for the entire request, and the choices field will always be an empty array. All other chunks will also include a usage field, but with a null value.

from litellm import completion 

completion = completion(
  model="gpt-4o",
  messages=[
    {"role": "system", "content": "You are a helpful assistant."},
    {"role": "user", "content": "Hello!"}
  ],
  stream=True,
  stream_options={"include_usage": True}
)

for chunk in completion:
  print(chunk.choices[0].delta)