Best Agent frameworks
Libraries for building LLM agents and apps.
Scores are based on research verified Oct 15, 2026, using our methodology.
#1 #2 #3 #4 #5 #6 #7
V
Vercel AI SDK open source
TypeScript toolkit for AI apps and agents
93
/ 100
P
Pydantic AI open source
Python agent framework from the Pydantic team
86
/ 100
L
LangChain / LangGraph open source
Frameworks for LLM apps and agents
85
/ 100
M
Mastra open source
TypeScript agent framework
85
/ 100
O
OpenAI Agents SDK open source
Python SDK for building agents
84
/ 100
C
CrewAI open source
Multi-agent framework and platform
82
/ 100
L
LlamaIndex open source
Framework for agents over your data
78
/ 100