Letta
Self-improving AI agents with memory that evolves with experience.
At a glance
Free + paid · Source review 2026-11-04- Price & billing
Free $0 per month verified on the pricing documentation: limited agents, 5 MiB of storage per memory repository, limited Letta Auto usage, and bring-your-own API keys and external coding plans. Paid tiers are page observations in $ without a named currency, so no paid-tier charge fact is recorded: Pro $20 per month with up to 20 stateful agents and 50 MiB per memory repository.
- Free allowance
Free $0 per month verified on the pricing documentation: limited agents, 5 MiB of storage per memory repository, limited Letta Auto usage, and bring-your-own API keys and external coding plans.
- Best suited to
Developers building stateful agents that remember everything, learn continuously, and improve with experience.; Teams that want agents with shared memory, skills, schedules, subagents, and permissions across an organization.; Builders who want to bring their own API keys, including coding plans, while using Letta Auto quotas on Pro.
Fit is editorial guidance, not a measured result.- Platforms
Access: not separately verified. Operating systems not separately verified.
Published-source facts and editorial guidance. No product test is implied. Confirm current conditions before purchase.
No product screenshot is claimed for this listing. Use the official website ↗ to inspect the current interface.
What to know before choosing
Good fit
Developers building stateful agents that remember everything, learn continuously, and improve with experience.; Teams that want agents with shared memory, skills, schedules, subagents, and permissions across an organization.; Builders who want to bring their own API keys, including coding plans, while using Letta Auto quotas on Pro.
Limits and trade-offs
Users who need more than the Free plan’s limited agents, 5 MiB per memory repository, and limited Letta Auto usage.; Users unwilling to bring their own keys or pay usage: API usage is charged on underlying token costs, and Pro overage is pay-as-you-go.; Users who want a simple stateless chatbot without memory, identity, and evolving capabilities, since stateful memory is Letta’s core.
Plans and free allowances
Free $0 per month verified on the pricing documentation: limited agents, 5 MiB of storage per memory repository, limited Letta Auto usage, and bring-your-own API keys and external coding plans. Paid tiers are page observations in $ without a named currency, so no paid-tier charge fact is recorded: Pro $20 per month with up to 20 stateful agents and 50 MiB per memory repository.
Evidence
Official homepage ↗ (reviewed 2026-11-04), Official pricing documentation ↗ (reviewed 2026-11-04)
Official published documentation reviewed; not a product test
Dates: Last reviewed 2026-11-04. Last reviewed is the latest source or editorial review date; it is not a content-change date.
A closer look at Letta
Letta builds machines that learn, shipped as Letta Agent: a self-improving AI agent whose memory, identity, and capabilities evolve with experience, with stateful agents, shared memory, skills, schedules, subagents, and self-hosting or cloud deployment, from the creators of MemGPT at UC Berkeley’s Sky Computing Lab.
Editorial guidance based on published documentation. The workflow below is a suggested starting point, not a measured product result.
When to choose Letta
- Developers building stateful agents that remember everything, learn continuously, and improve with experience.
- Teams that want agents with shared memory, skills, schedules, subagents, and permissions across an organization.
- Builders who want to bring their own API keys, including coding plans, while using Letta Auto quotas on Pro.
When to choose something else
- Users who need more than the Free plan’s limited agents, 5 MiB per memory repository, and limited Letta Auto usage.
- Users unwilling to bring their own keys or pay usage: API usage is charged on underlying token costs, and Pro overage is pay-as-you-go.
- Users who want a simple stateless chatbot without memory, identity, and evolving capabilities, since stateful memory is Letta’s core.
A practical starting workflow
- Install Letta Agent and start with the Free plan, bringing your own API keys and external coding plans.
- Build stateful agents with memory repositories, skills, schedules, and subagents, and run them in cloud sandboxes or self-hosted.
- Scale to Pro for remote sandboxes, Letta Auto quotas, and up to 20 stateful agents, or to Teams for shared agents and permissions.
Check before committing
- The pricing source is Letta documentation, since the letta.com pricing path resolves to docs.letta.com pricing; the homepage itself is a research-lab page.
- Usage-cost examples for casual and power coding users are illustrative ranges on the pricing page, not fixed plan prices, and are not asserted as facts.
Common questions
What is Letta Agent?
A self-improving AI agent whose memory, identity, and capabilities evolve with experience, shipping Letta’s research on machines that learn.
Can I use my own API keys?
Yes. All plans support bringing your own API keys, and usage then goes directly through the provider account instead of consuming Letta credits.
What does the Free plan include?
Getting started at no cost with $0 per month, limited agents, 5 MiB of storage per memory repository, limited Letta Auto usage, and bring-your-own keys.
What happens when I reach my Letta Auto limit?
The pricing FAQ addresses Letta Auto limits, usage needs, and overage, with Pro adding weekly and monthly quota plus pay-as-you-go overage.
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Sources and checks
Last source review is not a date of product testing. No rating or test result is implied by inclusion. Check the current plan and terms before buying.