Top 5 Open-Source Agentic Frameworks in 2025

I have reviewed several of the most popular open-source AI agent frameworks. In this article, I break down each framework’s multi-agent orchestration capabilities, agent and function definitions, memory capabilities, and human-in-the-loop support—exploring how each one functions and how easy it is to get started.

Agentic frameworks benchmark: CrewAI vs LangChain

Before diving into the broader comparison of the top open-source agentic frameworks, we start with a hands-on benchmark that highlights how architectural differences in multi-agent frameworks translate into real-world performance.

We selected CrewAI and LangChain for this benchmark because they represent fundamentally different approaches to agentic system design.We compared their latency and completion token usage across different data analysis tasks.

In our benchmark study, we observed that CrewAI outperformed LangChain in fundamental data analytics tasks such as Logistic Regression, Clustering, Descriptive Statistics, and Random Forest, delivering both lower latency and reduced token usage. Specifically, when analyzed task by task.

These results demonstrate that CrewAI consistently delivers both faster execution times and lower token costs across all tasks.

For this benchmark, we integrated the tasks into agent-based architectures on both frameworks using Python-based tools. Tasks were executed in a sequential flow with a multi-agent architecture on both platforms. We chose a sequential setup because steps like data downloading, cleaning, model training, and evaluation are inherently dependent on each other.

To ensure a fair comparison, we created two distinct agent roles on both frameworks: ML Engineer and Data Scientist.

However, since LangChain does not natively support multi-agent workflows, we had to manually orchestrate a multi-agent setup. This limitation arises from LangChain’s core architecture, which is chain-first and primarily designed for single-agent flows.

You can see our methodology in detail here.

Potential reasons behind the performance differences

The primary reason for CrewAI’s superior performance lies in its architecture, which is fundamentally designed around multi-agent systems. Task delegation, inter-agent communication, and state management are handled naturally and centrally at the framework level. Additionally, tools are directly connected to agents, enabling data flow with minimal middleware, resulting in faster and more efficient execution. This architecture contributes to both lower latency and reduced token consumption.

On the other hand, LangChain is chain-first and built with a single-agent focus at its core. Multi-agent support was added later and is not a native part of the framework’s natural flow. In LangChain, tool selection depends on the LLM’s natural language reasoning rather than direct function calls. While this approach offers more flexibility, it introduces more indirect steps, which leads to increased latency and higher token costs.

Compare agentic frameworks

Agentic frameworks vary across several key dimensions, and understanding these differences is essential for making meaningful comparisons.

Of note, LangGraph is proprietary software, but it provides an open-source library for agent development.

Here are the most important factors that distinguish one framework from another:

Multi-agent orchestration

LangGraph

LangGraph is a relatively well-known framework and stands out as a key option for developers building agent systems.

Explicit multi-agent coordination: You can model multiple agents as individual nodes or groups, each with its own logic, memory, and role in the system.

It creates AI workflows across APIs and tools. Thus, it is a good fit for RAG and custom pipelines.

That said, it is complex/challenging to debug and the learning curve is steep.

AutoGen

Free-form agent collaboration: AutoGen allows multiple agents to communicate by passing messages in a loop. Each agent can respond, reflect, or call tools based on its internal logic.

It has an asynchronous agent collaboration, making it particularly useful for research and prototyping scenarios where agent behavior requires experimentation or iterative refinement.

CrewAI

CrewAI offers a high-level abstraction that simplifies building agent systems by handling most of the low-level logic for you. However, CrewAI’s multi-agent orchestration is limited:

• There’s no built-in execution graph or flow control — agents self-organize based on responses.
• Multi-agent flows are linear or loop-based, not hierarchical or DAG-based.

With multiple agents sending messages, it could become difficult to trace, monitor, or debug agent decisions and coordination.

OpenAI Swarm

OpenAI has described Swarm as a multi-agent framework. However, based on what’s been shared so far:

Swarm currently operates via a single-agent control loop, with:

• Natural language routines in the system prompt
• Tool usage via docstring parsing
• An agent iteratively planning and executing tasks

Thus, it has no agent-to-agent communication (single-agent execution). Unlike frameworks like AutoGen (which supports message passing between agents) or CrewAI (which uses role-based team setups), Swarm has no built-in mechanism for agents to interact with each other.

This makes Swarm a good fit for prototyping, single-agent, step-by-step reasoning workflows using tools or routines (a natural language description of a tasks or workflows).

This approach makes routines in Swarm more flexible and generalizable than traditional scripts or rule-based flows rather than hard-coding logic.

LangChain

LangChain provides comprehensive RAG tooling but operates primarily through single-agent execution patterns.

Single-agent document processing: LangChain handles the user-to-answer pipeline through one coordinating agent that manages the RAG workflow. While LangChain supports multi-agent architectures through its extended components, the core framework lacks native agent-to-agent communication mechanisms.

Unlike AutoGen’s message-passing system or CrewAI’s role-based teams, LangChain’s base architecture routes everything through a central orchestrator rather than enabling direct agent collaboration. This makes it powerful for document-heavy applications but requires additional tooling for true multi-agent coordination.

Agent and function definition

LangGraph

LangGraph takes a graph-based approach to agent design, where each agent is represented as a node that maintains its own state. These nodes are connected through a directed graph, enabling conditional logic, multi-team coordination, and hierarchical control. This enables you build and visualize multi-agent graphs with supervisor nodes for scalable orchestration.

LangGraph uses annotated, structured functions that attach tools to agents—you can build out nodes, connect them to various supervisors, and visualize how different teams interact. Think of it like giving each team member a detailed job description. This makes it easier to build and test agents that work together.

AutoGen

AutoGen defines agents as adaptive units capable of flexible routing and asynchronous communication. Agents interact with each other (and optionally with humans) by exchanging messages, allowing for collaborative problem-solving. Like LangGraph uses annotated, structured functions.

CrewAI

CrewAI takes a role-based design approach. Each agent is assigned a role (e.g., Researcher, Developer) and a set of skills—functions or tools it can access. Function definition is through structured annotations.

OpenAI Swarm

OpenAI Swarm uses a routine-based model where agents are defined through prompts and function docstrings. It doesn’t have formal orchestration or state models, relying instead on manually structured workflows. Functions behavior is inferred by the LLM through docstrings (Swarm identifies what a function does by reading its description) making this setup flexible but less precise.

LangChain

LangChain uses a chain-based architecture where a single orchestrator agent manages calls to language models and various tools. It defines functions through explicit interfaces like toolkits and prompt templates.

While primarily focused on centralized workflows, LangChain supports extensions for multi-agent setups but lacks built-in agent-to-agent communication.

Memory

Memory capabilities:

• Stateful: Whether the framework supports persistent memory across executions.
• Contextual: Whether it supports short-term memory via message history or context passing.

Memory features is a key part of building agentic systems to remember context and adapt over time:

• Short-term memory: Keeps track of recent interactions, enabling agents to handle multi-turn conversations or step-by-step workflows.
• Long-term memory: Stores persistent information across sessions, such as user preferences or task history.
• Entity memory: Tracks and updates knowledge about specific objects, people, or concepts mentioned during interactions (e.g., remembering a company name or project ID mentioned earlier).

LangGraph

LangGraph uses two types of memory: in-thread memory, which stores information during a single task or conversation, and cross-thread memory, which saves data across sessions. Developers can use MemorySaver to save the flow of a task and link it to a specific thread_id. For long-term storage, LangGraph supports tools like InMemoryStore or other databases. This provides flexible control over how memory is scoped and retained across executions.

AutoGen

AutoGen uses a contextual memory model. Each agent maintains short-term context through a context_variables object, which stores interaction history. It doesn’t have built-in persistent memory.

CrewAI

CrewAI provides layered memory out of the box. It stores short-term memory in a ChromaDB vector store, recent task results in SQLite, and long-term memory in a separate SQLite table (based on task descriptions). Additionally, it supports entity memory using vector embeddings. This memory setup is automatically configured when memory=True is enabled,

OpenAI Swarm

Swarm is stateless and does not manage memory natively. Developers can pass short-term memory through context_variables manually, and optionally integrate external tools or third-party memory layers (e.g., mem0) to store longer-term context.

LangChain

LangChain supports both short-term and long-term memory through flexible components. Short-term memory is typically managed via in-memory buffers that track conversation history within a session. For long-term memory, LangChain integrates with external vector stores or databases to persist embeddings and retrieval data.

Developers can customize memory scopes and strategies using built-in memory classes, enabling efficient management of contextual and entity-specific memory across interactions.

Human-in-the-loop

LangGraph

LangGraph supports custom breakpoints (interrupt_before) to pause the graph and wait for user input mid-execution.

AutoGen

AutoGen natively supports human agents via UserProxyAgent, allowing humans to review, approve, or modify steps during agent collaboration.

CrewAI:

CrewAI enables feedback after each task by setting human_input=True; the agent pauses to collect natural language input from the user.

OpenAI Swarm

OpenAI Swarm offers no built-in HITL.

LangChain

LangChain allows inserting custom breakpoints within chains or agents to pause execution and request human input. This supports review, feedback, or manual intervention at defined points in the workflow.

What agentic frameworks actually do?

Agentic frameworks assist with prompt engineering and managing how data flows to and from LLMs. At a basic level, they help structure prompts so the LLM responds in a predictable format and route responses to the right tool, API, or document.

If building from scratch, you would manually define the prompt, extract the tool the LLM wants to use, and trigger the corresponding API call. Frameworks streamline this by:

• Prompt orchestration: Building, managing, and routing complex prompts to LLMs
• Tool integration: Letting agents call external APIs, databases, code functions, etc.
• Memory: Maintaining state across turns or sessions (short- and long-term)
• RAG integration: Enabling knowledge retrieval from external sources
• Multi-agent coordination: Structuring how agents collaborate or delegate tasks

Agentic frameworks: Real life use cases

LangGraph – Multi-agent travel planner

A production project built with LangGraph demonstrates a stateful, multi-agent travel assistant that pulls flight and hotel data (using Google Flights & Hotels APIs) and generates travel recommendations.⁶

CrewAI – Agentic content creator

CrewAI’s official examples repository includes flows like trip planning, marketing strategy, stock analysis, and recruitment assistants, where role-specific agents (e.g., “Researcher”, “Writer”) collaborate on tasks.⁷

CrewAI turns a high-level content brief into a complete article using Groq.⁸

Core features of agentic frameworks

Model support:

• Most are model-agnostic, supporting multiple LLM providers (e.g., OpenAI, Anthropic, open-source models).
• However, system prompt structures vary by framework and may perform better with some models than others.
• Access to and customization of system prompts is often essential for optimal results.

Tooling:

• All frameworks support tool use, a core part of enabling agent actions.
• Offer simple abstractions to define custom tools.
• Most support Model-Context-Protocol (MCP), either natively or through community extensions.

Memory / State:

• Use state tracking to maintain short-term memory across steps or LLM calls.
• Some helps agents retain prior interactions or context within a session.

RAG (Retrieval-Augmented Generation):

• Most include easy setup options for RAG, integrating vector databases or document stores.
• This allows agents to reference external knowledge during execution.

Other common features

• Support for asynchronous execution, enabling concurrent agent or tool calls.
• Built-in handling for structured outputs (e.g., JSON).
• Support for streaming outputs where the model generates results incrementally.
• Basic observability features for monitoring and debugging agent runs.

Benchmark methodology

In this benchmark, we designed fully equivalent pipelines to fairly and directly compare the LangChain and CrewAI frameworks. We executed four fundamental data analysis tasks—Random Forest, Clustering, Descriptive Statistics, and Logistic Regression—on both frameworks using the same dataset, the same tools, identical task definitions, and identical prompts.

Data and workflow

For data processing, we used the Telco Churn dataset on both frameworks, downloaded via the DownloadDatasetTool from the same GitHub source. Data preprocessing, loading, and overall data flow were structured identically across both platforms.

To ensure secure data sharing between agents and tasks, we implemented thread-safe global state management using Python’s threading.Lock mechanism in both frameworks.

All experiments were executed with the same OpenAI API key, the same LLM model, and identical configuration parameters, including timeout, maximum iterations, and other settings.

Tool alignment

The tools used in both frameworks—DownloadDatasetTool, LoadDataTool, TrainModelTool, and EvaluateModelTool—were designed to be functionally identical. Error handling, input/output structures, and global state integrations were consistently implemented across both platforms. In addition, fail-safe mechanisms were developed in parallel to ensure that both systems could terminate gracefully in case of errors.

Tools in CrewAI are directly linked to specific agents, allowing straightforward and efficient task execution. In LangChain, however, tool usage depends on the LLM’s natural language understanding to select and invoke tools, since multi-agent orchestration is manually implemented and not native to the framework.

Task definitions and execution flow

Task definitions and execution order were also designed to be exactly the same. Both systems employed two agents: “Data Scientist” and “ML Engineer”. These agents executed the same tasks, in the same order, with the same dependency structure. Task descriptions and role definitions were made to match word-for-word to ensure consistency.

Adapting to framework-native architectures

CrewAI is built around a role-based, declarative architecture that naturally supports multi-agent systems. In this setup, each agent is clearly defined with a role and a specific goal. Tasks are explicitly assigned to agents, and for each task, a detailed description and an expected output must be provided. The entire workflow is organized under a centralized Crew structure and executed with a single command. In CrewAI, parameters like task order and expected outputs are mandatory and form an integral part of how the framework operates.

In contrast, LangChain adopts a tool-centric and procedural approach. Agents are created based on a set of tools and a general task type. Unlike CrewAI’s declarative flow, LangChain requires the developer to manually control the task execution step-by-step. Each task must be explicitly invoked by the developer, with no automatic orchestration between steps.

Preserving architectural differences

This methodology preserves the natural architectural differences between the two frameworks. Rather than forcing the frameworks into a uniform execution model, we ensured strict alignment in inputs, tasks, and tool functionality, while allowing each framework’s native execution paradigm to operate as intended. This approach guarantees that the benchmark results reflect how each framework performs in its realistic, idiomatic usage scenario.

Python environment and execution logic

All implementations were carried out in a Python environment. We integrated the tasks into agent-based architectures on both frameworks using Python-based tools. Tasks were executed in a sequential flow with a multi-agent architecture on both platforms. We intentionally chose a sequential setup because steps like data downloading, data cleaning, model training, and model evaluation are inherently dependent on each other, making sequential execution the most logical and realistic approach for this benchmark.

External Links

• 1. A Guide to Building Agentic RAG Systems with LangGraph. Analytics Vidhya
• 2. Top 5 Frameworks for Building AI Agents in 2024 (Plus 1 Bonus) - DEV Community. DEV Community
• 3. Top 5 Frameworks for Building AI Agents in 2024 (Plus 1 Bonus) - DEV Community. DEV Community
• 4. How OpenAI Swarm Enhances Multi-Agent Collaboration?. Analytics Vidhya
• 5. Agentic AI and Automation - by Sasha Pasmanik. Stay Curious
• 6. Automate Your Travel Plans with Multi-Agent AI & LangGraph | by Jalaj Agrawal | Medium. Medium
• 7. Introduction - CrewAI.
• 8. https://medium.com/analytics-vidhya/groq-powered-content-creator-agent-using-crewai-langchain-2e5eaad738ac