Open-source frameworks and SDKs developers use to build their own AI agents. Compared on language, license, cost and paid hosting options.
Quick answer
From the 8 AI agent frameworks on Klyvoo, with prices checked on each official site.
| Agent | Best for | Starting price | Pricing model | Free trial | Standout |
|---|---|---|---|---|---|
| LangGraph | Stateful long-running agents with fine control | Free (open source) | Free; pay for model API usage and optional LangSmith hosting | Free LangSmith tier | Durable execution that recovers from failures |
| CrewAI | Role-based multi-agent teams and workflows | Free (open source) | Free; pay for model API usage and optional CrewAI AMP plan | Free AMP Basic plan | Simple role and task model for multi-agent teams |
| OpenAI Agents SDK | Lightweight multi-agent apps with handoffs | Free (open source) | Free; pay for model API usage | Small set of building blocks, easy to learn | |
| Claude Agent SDK | Agents that read files, run commands and edit code | Free SDK; pay for Claude API use | Free SDK; pay for Claude API usage | Built-in tools for files, shell and web search | |
| Microsoft Agent Framework | .NET and Python teams building production agents | Free (open source) | Free; pay for model API usage and any Azure hosting | Successor to AutoGen and Semantic Kernel, with migration guides | |
| Google Agent Development Kit (ADK) | Multi-language agents with easy Google Cloud deployment | Free (open source) | Free; pay for model API usage and any cloud hosting | Five language SDKs with a consistent API | |
| LlamaIndex | Document-heavy agents and RAG in Python | Free (open source); LlamaParse from $50/mo | Free framework; optional credit-based LlamaParse cloud plans | Free LlamaParse plan | Deep tooling for document ingestion, retrieval and RAG |
| Mastra | TypeScript developers building agents into web apps | Free (open source); Cloud Teams $250/mo | Free framework; usage-based cloud plans for hosting and observability | Free Mastra Cloud Starter | Native TypeScript with Next.js, React, Express and Hono integrations |
Prices in USD from each vendor’s official pricing page, checked October 2026. Some links may be affiliate links; that never changes our picks.
AI agent framework
Best for: stateful long-running agents with fine control
Low-level orchestration framework from LangChain for building stateful agents as graphs with durable execution.
AI agent framework
Best for: role-based multi-agent teams and workflows
Python framework for running teams of role-based AI agents as crews, with event-driven Flows for workflow control.
AI agent framework
Best for: lightweight multi-agent apps with handoffs
Lightweight open-source framework from OpenAI for multi-agent workflows with handoffs, guardrails and built-in tracing.
AI agent framework
Best for: agents that read files, run commands and edit code
Anthropic's SDK that packages Claude Code's tools, agent loop and context management as a Python or TypeScript library.
AI agent framework
Best for: .NET and Python teams building production agents
Open-source Microsoft framework for agents and multi-agent workflows, and the successor to AutoGen and Semantic Kernel.
AI agent framework
Best for: multi-language agents with easy Google Cloud deployment
Google's open-source, code-first toolkit for building, testing and deploying agents in Python, TypeScript, Go, Java and Kotlin.
AI agent framework
Best for: document-heavy agents and RAG in Python
Open-source Python toolkit for building LLM agents and event-driven workflows over your own documents and data.
AI agent framework
Best for: typeScript developers building agents into web apps
Open-source TypeScript framework for AI agents and workflows with memory, tools, evals and a local Studio.
Every price on Klyvoo comes from the vendor’s official pricing page. How we review
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