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refactor(graph): apply dependency inversion to default model creation #268

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refactor(graph): apply dependency inversion to default model creation #268

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7 changes: 4 additions & 3 deletions libs/deepagents/graph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@
from langchain.agents.middleware.summarization import SummarizationMiddleware
from langchain.agents.middleware.types import AgentMiddleware
from langchain.agents.structured_output import ResponseFormat
from langchain_anthropic import ChatAnthropic
from langchain_anthropic.middleware import AnthropicPromptCachingMiddleware
from langchain_core.language_models import BaseChatModel
from langchain_core.tools import BaseTool
Expand All @@ -25,12 +24,14 @@
BASE_AGENT_PROMPT = "In order to complete the objective that the user asks of you, you have access to a number of standard tools."


def get_default_model() -> ChatAnthropic:
def get_default_model() -> BaseChatModel:
"""Get the default model for deep agents.

Returns:
ChatAnthropic instance configured with Claude Sonnet 4.
BaseChatModel instance configured with Claude Sonnet 4.
"""
from langchain_anthropic import ChatAnthropic

return ChatAnthropic(
model_name="claude-sonnet-4-5-20250929",
max_tokens=20000,
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