Ranked · Agent frameworks
Best Agent frameworks — Seat model
4 of 14 researched agent frameworks have a confirmed yes for Seat model. Qualified, negative, and unknown answers stay distinct.
The ranking
4 of 14 agent frameworks have a confirmed yes for “Seat model”. 1 are qualified or tier-scoped, 2 are confirmed no, and 7 remain not established. Only confirmed yes answers appear in this set; an unknown is never treated as a negative.
How we ranked these
Projected from the live listing datasheets using the tenant’s “Per seat, and is there a floor or a ceiling?” axis. Membership requires a sourced yes; partial and unknown answers are reported above but excluded from the ranking. Entries retain the directory’s paid-tier ordering, visibly labelled on every promoted card.
All picks at a glance
All 4 compared on one screen. Pick a row to jump to the full entry.
The ranking
Editor’s pick
#1
Agno
Python SDK, self-hosted AgentOS runtime and hosted control plane for building and running agents
- #2
LangChain
Open source agent framework plus LangSmith, its hosted observability, evaluation and deployment platform
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Side by side
All 4 compared. Scroll the table sideways, the fact column stays pinned →
| Feature | Agno | LangChain | LangGraph | Letta |
|---|---|---|---|---|
| Description | Python SDK, self-hosted AgentOS runtime and hosted control plane for building and running agents | Open source agent framework plus LangSmith, its hosted observability, evaluation and deployment platform | MIT-licensed orchestration framework and runtime for stateful, long-running LLM agents. | Stateful agent harness with git-backed memory, run from a CLI, desktop app, web, or SDK |
| Category | Agent platforms, Agent frameworks | Agent frameworks | Agent frameworks | Coding agents, Agent frameworks |
| Pricing | Free | Free | $0/seat/month | $0 / month |
| Tags |
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This ranking
- 4 agents ranked
- 4 of 4 with known API status offer an API
- paid plans $20-$150
- 3 free or freemium
- verified August 31, 2026
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