Letta
Framework and cloud for stateful AI agents with persistent memory, plus a CLI coding agent.
How the 5.5 was reached
- Quality of output6/10
Independent benchmark shows about 83% on LoCoMo memory tests; only one independent source, plus vendor case studies. dev.to
- Ease of use6/10
One-line npm install is listed, but docs page was not found and no onboarding evidence. letta.com
- Pricing value8/10
Free plan with 3 agents, Pro $20/month, usage-based developer plans at $0.10 per agent plus LLM costs. docs.letta.com
- API and integration quality2/10
No API or integrations found on the homepage, pricing page or docs search; docs page not found. letta.com
- Solves the problem it claims to solven/a
no evidence found
5.5/10 is the mean of the 4 criteria that apply. Scored on the five-criteria rubric v1, 29 September 2026. How scoring works
Pricing
- 3 stateful agents
- Remote sandboxes
- Letta Auto quota
- Letta Auto with quotas
- $0.10 per active agent per month
- Pay-as-you-go LLM usage
Key Features
- Stateful agents with memory that persists across conversations
- CLI installed with npm i -g @letta-ai/letta-code
- Cloud agents with GitHub and Slack integrations
- Channels for Slack, Telegram, Discord, WhatsApp and Signal
- Self-hosting via an app server, and MCP support
Pros & Cons
Pros
- Free plan and a low $20 monthly Pro tier
- Usage-based developer pricing at $0.10 per agent
- Memory-focused design; one independent benchmark shows about 83% on LoCoMo
- One-line npm install
Cons
- Only one independent benchmark source for output quality
- API and integration evidence scored low in the review
- No clear onboarding evidence
- Pricing mixes seats, agents and LLM costs, which is harder to forecast
Suits developers experimenting with agents that need long-term memory, and the free plan makes that cheap to try. Teams that need firm integration docs or proven results should hold off.
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