Anthropic

export ANTHROPIC_API_KEY="sk-ant-..."

pip install anthropic

from definable.model.anthropic import Claude
from definable.model.message import Message

model = Claude(id="claude-sonnet-4-20250514")
response = model.invoke(
    messages=[Message(role="user", content="Hello!")],
    assistant_message=Message(role="assistant", content=""),
)
print(response.content)

agent = Agent(model="anthropic/claude-sonnet-4-20250514")

from definable.model.anthropic import Claude