Pydantic DeepAgents vs LangChain Deep Agents
Both implement the deep agent pattern. DeepAgents uses Pydantic AI for full type safety; LangChain Deep Agents uses LangGraph with access to the broader LangChain ecosystem.
Key Differences
Foundation & Type Safety
Pydantic DeepAgents is built on Pydantic AI — full type safety with Pydantic models for inputs, outputs, and structured results. LangChain Deep Agents is built on LangGraph with dict-based message passing.
Ecosystem & Integrations
LangChain Deep Agents leverages the full LangChain ecosystem: 800+ integrations, LangSmith tracing, LangGraph Studio, MCP adapters, and sandbox partners (Modal, Runloop, Daytona). It also has a JS/TS variant.
Architecture & Modularity
Pydantic DeepAgents has independently usable packages (planning, subagents, summarization, middleware, backends). LangChain Deep Agents is a single monorepo with tightly coupled packages around LangGraph.
Feature Comparison
| Feature | Pydantic DeepAgents | LangChain Deep Agents |
|---|---|---|
| Foundation | Pydantic AI | LangGraph |
| Type Safety | ✓ | ✗ |
| Planning (TODOs) | ✓ | ✓ |
| Filesystem Tools | ✓ | ✓ |
| Subagent Delegation | ✓ | ✓ |
| Context Management | ✓ | ✓ |
| Structured Output | ✓ | ✗ |
| Lifecycle Hooks | ✓ | ✗ |
| Cost Tracking | ✓ | ✗ |
| Agent Teams | ✓ | ✗ |
| JS/TS Variant | ✗ | ✓ |
| Sandbox Partners | Docker | Modal, Runloop, Daytona |
| CLI | ✓ | ✓ |
| Persistent Memory | ✓ | ✓ |
Code Comparison
from pydantic_deep import ( create_deep_agent, create_default_deps, LocalBackend)from pydantic_deep.types import SubAgentConfig
agent = create_deep_agent( model="openai:gpt-4.1", instructions="You are a senior developer.", include_todo=True, include_filesystem=True, include_subagents=True, include_memory=True, subagents=[SubAgentConfig( name="code-reviewer", description="Reviews code for bugs", instructions="You are a senior reviewer.", )],)
deps = create_default_deps(LocalBackend("."))result = await agent.run( "Refactor auth module", deps=deps)from deepagents import create_deep_agentfrom langchain.chat_models import init_chat_model
agent = create_deep_agent( model=init_chat_model("openai:gpt-4o"), tools=[my_custom_tool], system_prompt="You are a coding assistant.",)
result = agent.invoke({ "messages": [{ "role": "user", "content": "Refactor auth module", }]})When to Use Which
Choose Pydantic DeepAgents when:
- Choose Pydantic DeepAgents when you want type-safe agents built on Pydantic AI, modular architecture with independently usable packages, structured output, lifecycle hooks, and cost tracking.
Choose LangChain Deep Agents when:
- Choose LangChain Deep Agents when you're already in the LangChain ecosystem, need LangGraph Studio for visual debugging, want JS/TS support, or need sandbox integrations with Modal/Runloop/Daytona.
Frequently Asked Questions
Both projects have create_deep_agent() — what's the difference?
Is Pydantic DeepAgents inspired by LangChain Deep Agents?
Can I use both in the same project?
Which has better sandbox support?
Related Comparisons
Pydantic DeepAgents vs CrewAI
Autonomous deep agents (DeepAgents) vs role-based agent crews (CrewAI). DeepAgents offers more control; CrewAI is faster for multi-agent team prototypes.
Pydantic DeepAgents vs AutoGen (AG2)
DeepAgents vs AutoGen: Pydantic AI autonomous agents vs multi-agent group chats. DeepAgents is simpler; AutoGen is better for agent-to-agent dialogue use cases.
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