Claude Agent SDK
The Claude Agent SDK is Anthropic's library for building agents on the same loop that powers Claude Code.
- Agent framework (code)
- Open source
- MCP
Free · 8,394 stars
Agent framework (code)
OpenAI Agents SDK
Agent framework from OpenAI. Supports MCP servers.
Checked 2026-10-31
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The OpenAI Agents SDK is an MIT-licensed Python framework for multi-agent workflows, with a JavaScript and TypeScript version alongside. Its README lists agents, sandbox agents for long tasks in a container, realtime and voice agents, handoffs and agents-as-tools, guardrails, human-in-the-loop, sessions and tracing, and says it works with the Responses and Chat Completions APIs and with more than a hundred other models. It needs Python 3.10 or newer. The SDK costs nothing to install; model calls are billed by whichever provider you use. We would suggest it to teams on OpenAI models who want a small set of building blocks without a graph engine. The main limit is that tracing and several features are tied to OpenAI's platform, so portability depends on what you adopt. Our framework guide compares it with LangGraph, CrewAI and the others. We read the README on 31 October 2026 and have not built with it ourselves.
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Agent Development Kit (ADK)
Agent Development Kit, or ADK, is Google's open-source, code-first framework for building, evaluating and deploying agents.
- Agent framework (code)
- Open source
- MCP
Free · 22,051 stars
Pydantic AI
Pydantic AI is an MIT-licensed Python agent framework from the team behind Pydantic.
- Agent framework (code)
- Open source
- MCP
Free · 20,962 stars
LangGraph
LangGraph is an MIT-licensed framework from LangChain for building agents as graphs with state, with MCP support through an adapter we could not confirm in detail.
- Agent framework (code)
- Open source
- MCP
Free tier + paid · 44,183 stars
CrewAI
CrewAI is an MIT-licensed Python framework for teams of cooperating agents, with MCP support, plus a hosted product called AMP.
- Agent framework (code)
- Open source
- MCP
Free tier + paid · 60,313 stars
AI Agent Frameworks: Twelve Compared for Developers
Checked 2026-10-31
Agentic AI Frameworks: Patterns and Which Tool Fits
Checked 2026-10-31
Questions
How much does OpenAI Agents SDK cost?
Pricing: Free, checked 31 October 2026.
Is OpenAI Agents SDK open source?
Yes, under the MIT licence. The code is at github.com/openai/openai-agents-python.
Does OpenAI Agents SDK work with MCP servers?
Yes.
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- Agent framework (code)
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Mastra
Mastra is a TypeScript agent framework with MCP support.
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