configurable_alternatives(
self,
which: ConfigurableField,
*,
default_key: str = 'default',
prefix_keys: | Name | Type | Description |
|---|---|---|
which* | ConfigurableField | The |
default_key | str | Default: 'default'The default key to use if no alternative is selected. |
prefix_keys | bool | Default: FalseWhether to prefix the keys with the |
**kwargs | Runnable[Input, Output] | Callable[[], Runnable[Input, Output]] | Default: {} |
Configure alternatives for Runnable objects that can be set at runtime.
from langchain_anthropic import ChatAnthropic
from langchain_core.runnables.utils import ConfigurableField
from langchain_openai import ChatOpenAI
model = ChatAnthropic(
model_name="claude-sonnet-4-5-20250929"
).configurable_alternatives(
ConfigurableField(id="llm"),
default_key="anthropic",
openai=ChatOpenAI(),
)
# uses the default model ChatAnthropic
print(model.invoke("which organization created you?").content)
# uses ChatOpenAI
print(
model.with_config(configurable={"llm": "openai"})
.invoke("which organization created you?")
.content
)A dictionary of keys to Runnable instances or callables that
return Runnable instances.