get_default_model() -> ChatAnthropicGet the default model for Deep Agents.
Deprecated since 0.5.3; will be removed in deepagents==1.0.0.
Construct your model explicitly (e.g.,
ChatAnthropic(model_name="claude-sonnet-4-6")).
Used as a fallback when model=None is passed to create_deep_agent.
Requires ANTHROPIC_API_KEY to be set in the environment.