Adapters Overview

langchat.providers        ← public API (what you use)
      │
langchat.adapters         ← implementations (OpenAI, Pinecone, Supabase, Flashrank)
      │
langchat.core             ← business logic (engine, sessions, chains)

# Recommended — use providers
from langchat.providers import OpenAI, Pinecone, Supabase

# All at once via the module
import langchat.providers as providers
llm = providers.OpenAI("gpt-4o-mini")

# These are equivalent:
llm = OpenAI("gpt-4o-mini", api_key="sk-...")         # explicit
llm = OpenAI("gpt-4o-mini")                           # reads OPENAI_API_KEY

# If OPENAI_API_KEY is not set and no api_key is passed:
# ValueError: OpenAI API key is required. Set OPENAI_API_KEY environment variable
#             or pass api_key parameter.