LlamaIndex setup

LlamaIndex reaches OpenAI-compatible APIs through the OpenAILike class. Configure it with the Claudech base URL and a model id.

Before you start#

A Claudech API key from API keys, stored as CLAUDECH_API_KEY. API access unlocks after your first purchase.

Configuration#

Python

# pip install llama-index-llms-openai-like
import os
from llama_index.core import Settings
from llama_index.llms.openai_like import OpenAILike

llm = OpenAILike(
    model="claude-opus-5-5",
    api_base="https://api.claudech.com/v1",
    api_key=os.environ["CLAUDECH_API_KEY"],
    is_chat_model=True,
    is_function_calling_model=True,
    context_window=1_000_000,
)
Settings.llm = llm

print(llm.complete("Give me three names for a bakery."))

is_chat_model=True sends requests to /v1/chat/completions, and is_function_calling_model=True lets agents use tool calling. context_window matches the 1M-token window of every Claudech model.

Things to know#

Embeddings. Claudech does not offer an embeddings endpoint. Set Settings.embed_model to another provider or a local embedding model; queries and answers still run on Claudech.

See all integrations for other frameworks. Claudech is an independent service and is not affiliated with the makers of LlamaIndex.