Best Agent frameworks — A company can buy it

The ranking

1. ★ Editor’s pick

   #1LA

   LangGraph

   Open-source orchestration framework and runtime for stateful, long-running LLM agents, from LangChain.

   Best forEngineering teams building production agents who need cyclical graphs, durable state and replayable runs

   A company can buy it: Yes — Sold to organisations with workspaces and per-seat billing; Enterprise adds annual invoicing, custom terms and an infosec review.“A seat is a distinct user inside your organization. We consider the total number of users (including invited users) to determine the number of seats to bill.”General Questions FAQ, 'What is a seat?' · checked 2026-09-02

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2. #2AG

   Agno

   Python SDK plus self-hosted AgentOS runtime and hosted control plane for building and operating agents.

   Best forPython developers who want an Apache 2.0 SDK with memory, knowledge, learning, guardrails and a Control Plane they run inside their own cloud account, and who are comfortable running Docker or a cloud deploy template themselves.

   A company can buy it: Yes — Pro is bought as a team plan with three seats and roles, and Enterprise adds custom contracting, security reviews and an SLA.“Pro starts with three team seats and one live connection for $150 per month. Everyone on those seats shares access to the same connected runtimes.”FAQ, "How many members and live connections does Agno Pro include?" · checked 2026-10-11

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3. #3CS

   Claude Agent SDK

   Python and TypeScript library that runs Claude Code's agent loop and tools inside your own application.

   Best forDevelopers already building on Claude (or Claude Code) who want its exact agent loop, tools and context management as a callable library, and are comfortable being single-vendor on Anthropic in exchange for the tightest possible integration with Claude Code's own capabilities.

   A company can buy it: Yes — Usage is bought through a Console organization with members, roles, invites and workspaces, manageable by hand or through the Admin API.“To collaborate with teammates and add members, set up your organization in Console → Settings → Organization.”Tip callout at top of page · checked 2026-09-02

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5. #4MA

   Mastra

   Open-source TypeScript framework for building AI agents, with a hosted platform for running and observing them.

   Best forFull-stack JavaScript and TypeScript teams, especially those already building in Next.js or Node, who want agents, durable workflows and memory unified in one framework without adopting a Python-first stack.

   A company can buy it: Yes — Teams plan is self-serve at a published price with multi-team support; Enterprise is bought through an Order Form with sales.“Teams For growing teams $250/ month”Mastra Platform plan cards, Teams card header and price cell · checked 2026-09-02

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6. #5LE

   Letta

   Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.

   Best forDevelopers and researchers who specifically need an agent whose memory, skills and identity genuinely persist and evolve across long-running sessions, rather than reset on every call.

   A company can buy it: Yes — Teams Pro is sold per seat at $20/seat/month; Enterprise is a custom volume quote.“Teams Pro For teams $20 /seat/month”Plans, Teams / Enterprise tab, Teams Pro card · checked 2026-09-02

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7. #6LA

   LiveKit Agents

   Open-source Python and Node.js framework for voice AI agents, with LiveKit Cloud hosting, telephony and observability.

   Best forEngineering teams that want to own their voice-agent stack end to end, self-hosted or on LiveKit Cloud, without being locked into one vendor's API.

   A company can buy it: Yes — Paid plans are self-serve by card; Enterprise is quoted, adds non-credit-card billing and a support SLA, and requires an annual commitment. Team collaboration starts on Ship.“Enterprise plans can be configured with custom limits well above the published Build, Ship, and Scale numbers. They come with an annual commitment”Enterprise plans section · checked 2026-09-02

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8. #7LL

   LlamaIndex

   Open-source agent framework plus a credit-metered document parsing, extraction and indexing platform.

   Best forEngineers building RAG-heavy or document-heavy agents who want an MIT-licensed OSS core with an optional managed parsing and extraction platform on top.

   A company can buy it: Yes — Organizations hold members and projects; Enterprise is contracted with sales.“This is done through the use of Organizations, which has a list of team members that have access to all resources under that organization.”Intro paragraph · checked 2026-09-02

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9. #8CR

   CrewAI

   Open-source multi-agent framework with a managed platform for deploying and governing agent workflows.

   Best forDevelopers who want to stand up a role-based, collaborating multi-agent system quickly in Python, with a stable MIT-licensed core and a hosted build and runtime for production.

   A company can buy it: Yes — Accounts are organisations with members, teams, roles and billing under organisation settings, and the Enterprise plan is sold to the organisation rather than the individual.“Manage billing, plans, and organization configuration”Feature Permissions Matrix, organization_settings row, Description column · checked 2026-09-13

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10. #9LA

    LangChain

    Open source agent frameworks plus LangSmith, a hosted platform to trace, evaluate, deploy and govern agents.

    Best forEngineering teams building a bespoke, production-grade agent who want the largest integration ecosystem plus real stateful control.

    A company can buy it: Yes — Plus is bought self-serve by an organisation with unlimited seats and shared workspaces; Enterprise adds annual invoicing, custom terms and an infosec review for procurement.“Add unlimited seats $39 per seat/month”Plan comparison table, Pricing section, Users row (Plus column) · checked 2026-09-18

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