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Pydantic DeepAgents vs LangChain Deep Agents

Both implement the same deep agent pattern (planning, filesystem, subagents, context management). Pydantic DeepAgents is built on Pydantic AI with full type safety. LangChain Deep Agents is built on LangGraph with access to the LangChain ecosystem.

Key Differences

Advantage: Pydantic DeepAgents

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.

Advantage: LangChain Deep Agents

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.

Advantage: Pydantic DeepAgents

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

Pydantic DeepAgents
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
)
LangChain Deep Agents
from deepagents import create_deep_agent
from 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?
Both implement the same deep agent pattern but on different foundations. Pydantic DeepAgents (pydantic-deep) returns a Pydantic AI agent you call with await agent.run(). LangChain Deep Agents (deepagents) returns a compiled LangGraph graph you call with agent.invoke(). The core features (planning, filesystem, subagents) are nearly identical.
Is Pydantic DeepAgents inspired by LangChain Deep Agents?
Yes. Pydantic DeepAgents was inspired by LangChain's Deep Agents research on autonomous agent architectures. Both projects aim to replicate the deep agent pattern used by Claude Code, Devin, and Manus AI — but Pydantic DeepAgents builds on Pydantic AI instead of LangGraph.
Can I use both in the same project?
They are separate packages (pydantic-deep vs deepagents) with different dependencies and APIs. While technically you can install both, it's better to pick one foundation: Pydantic AI or LangGraph. Each has its own CLI, tool system, and agent lifecycle.
Which has better sandbox support?
LangChain Deep Agents has more sandbox partners out of the box: Modal, Runloop, and Daytona via dedicated packages. Pydantic DeepAgents supports Docker sandboxing through its backend system. Both isolate agent execution for safety.

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