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LiteLLM is a unified interface for calling 100+ LLM APIs using the OpenAI format. Braintrust automatically traces LiteLLM calls across all providers including OpenAI, Azure, Anthropic, Cohere, Replicate, and more.

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Setup

Install LiteLLM alongside the Braintrust SDK: 
// uv
uv add braintrust litellm
// pip
pip install braintrust litellm

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Trace with LiteLLM

Braintrust provides a patch function that automatically instruments LiteLLM to capture all model interactions. Call patch_litellm() before importing LiteLLM to enable automatic tracing:
trace-litellm.py
from braintrust.wrappers.litellm import patch_litellm

patch_litellm()

import litellm
from braintrust import init_logger

# Initialize Braintrust
logger = init_logger(project="litellm-example")

# Use LiteLLM as normal - all calls are automatically traced
response = litellm.completion(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "What is the capital of France?"}]
)
This will automatically send all LiteLLM interactions to Braintrust, including:
  • Model calls across different providers
  • Request and response data
  • Token usage and costs
  • Latency metrics
  • Error tracking

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