The best pydantic-ai alternatives

ag2

ag2ai/ag2

AG2 (formerly AutoGen): The Open-Source AgentOS.Join us at: https://discord.gg/sNGSwQME3x

Choose ag2 if…

• Apache License 2.0 suits your use better than MIT License
• you prefer a smaller, narrower project to a large one
• you specifically need a2a or ag2

Shares agent-framework, genai, llm, python with pydantic-ai.

haystack

deepset-ai/haystack

Open-source AI orchestration framework for building context-engineered, production-ready LLM applications. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Built for scalable agents, RAG, multimodal applications, semantic search, and conversational systems.

Choose haystack if…

• Apache License 2.0 suits your use better than MIT License
• you specifically need agentic-ai or agentic-rag

Shares agent-framework, genai, llm, python with pydantic-ai.

hive

aden-hive/hive

Multi-Agent Harness for Production AI

Choose hive if…

• Apache License 2.0 suits your use better than MIT License
• you want something your agent can install directly rather than a library to wire up yourself
• you specifically need agent or agent-skills

Shares agent-framework, harness, harness-engineering, python with pydantic-ai.

harness-sdk

strands-agents/harness-sdk

Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.

Choose harness-sdk if…

• Apache License 2.0 suits your use better than MIT License
• you prefer a smaller, narrower project to a large one
• you specifically need agentic or agentic-ai

Shares agent-framework, harness, llm, python with pydantic-ai.

agents-towards-production

NirDiamant/agents-towards-production

End-to-end, code-first tutorials for building production-grade GenAI agents. From prototype to enterprise deployment.

Choose agents-towards-production if…

• you would rather work in Jupyter Notebook than Python
• you specifically need agent or agentic-ai

Shares agent-framework, genai, llm, python with pydantic-ai.

langchain

langchain-ai/langchain

The agent engineering platform.

Choose langchain if…

• you want the more widely starred option (149.4k)
• you specifically need agents or ai

Shares llm, pydantic, python with pydantic-ai.

deer-flow

bytedance/deer-flow

An open-source long-horizon SuperAgent harness that researches, codes, and creates. With the help of sandboxes, memories, tools, skill, subagents and message gateway, it handles different levels of tasks that could take minutes to hours.

Choose deer-flow if…

• you want the more widely starred option (85.3k)
• you specifically need agent or agentic

Shares harness, llm, python with pydantic-ai.

mem0

mem0ai/mem0

The Memory Layer for AI Agents - Drop-in memory infrastructure for AI agents and apps. Context that persists. Built for production.

Choose mem0 if…

• Apache License 2.0 suits your use better than MIT License
• you want the more widely starred option (68.9k)
• you specifically need agentic-memory or agentic-memory-system

Shares genai, llm, python with pydantic-ai.

langgraph

langchain-ai/langgraph

Build resilient agents.

Choose langgraph if…

• you want the more widely starred option (44.9k)
• you specifically need agents or ai

Shares llm, pydantic, python with pydantic-ai.

deepagents

langchain-ai/deepagents

The batteries-included agent harness.

Choose deepagents if…

• you specifically need ai or deepagents

Shares harness, harness-engineering, python with pydantic-ai.

openai-agents-python

openai/openai-agents-python

A lightweight, powerful framework for multi-agent workflows

Choose openai-agents-python if…

• you specifically need agents or ai

Shares harness, llm, python with pydantic-ai.

bisheng

dataelement/bisheng

BISHENG is an open-source enterprise Agent platform for building, deploying, and managing AI applications. It combines AI agents, workflows, RAG and knowledge management, desktop agent integration, and vibecoding app hosting with unified model management, evaluation, observability, access control, and enterprise administration.

Choose bisheng if…

• Apache License 2.0 suits your use better than MIT License
• you want something your agent can install directly rather than a library to wire up yourself
• you specifically need agent or ai

Shares genai, llm, python with pydantic-ai.