Configure Language Models with dspy.LM

dspy.LM is DSPy's unified interface for calling language models. It wraps LiteLLM so any provider -- OpenAI, Anthropic, Google, Together AI, Ollama, vLLM, and 100+ others -- works through one consistent API. You configure a model once, then every DSPy module uses it automatically.

Basic setup

import dspy

# Create an LM instance with a provider/model string
lm = dspy.LM("openai/gpt-4o-mini")  # or "anthropic/claude-sonnet-4-5-20250929", etc.

# Set it as the default for all DSPy modules
dspy.configure(lm=lm)