Agent runtime
Letta
Stateful agent hosting with persistent memory and separately metered tools and model usage.
The essentials
What Letta offers
Letta provides a runtime for agents that retain context across conversations. This profile separates its developer API pricing from personal and team subscriptions so that cloud execution costs are easier to evaluate.
Choose a plan by workload and access method. The API plan charges separately for the subscription, active agents, tools and model usage. Specifications not confirmed in the linked documentation are explicitly marked rather than inferred.
Subscription & usage
Choose a plan. Check the scope.
These plans can serve different access methods. Model usage and resource charges may be additional.
API Plan
SubscriptionUSD 20/mo
Per API subscription, plus usage
Unlimited agent creation; active-agent and tool usage billed separately.
$0.10 / active agent / month; $0.00015 / second of tool execution; model tokens additional.
Full conditions & limits
Pricing
- Pricing model
- Published
- Base subscription amount (not total cost)
- 20
- Currency
- USD
- Billing interval
- Monthly
- Subscription scope
- Per API subscription, plus usage
- Included usage
- Unlimited agent creation; active-agent and tool usage billed separately.
- Overage rates
- $0.10 / active agent / month; $0.00015 / second of tool execution; model tokens additional.
- Model costs and BYOK conditions
- Model usage is additional. External API keys are supported; provider charges still apply.
5 fields not disclosed
Annual commitment / upfront payment · Setup fee · Free trial / credits / expiry · Cancellation and refunds · Tax treatment
Resources and limits
- Agent limit
- Unlimited agent creation; active agents are billable.
11 fields not disclosed
CPU allocation and billing basis · RAM · GPU / VRAM · Storage and persistence · Network egress · Concurrency · Execution quota · Maximum session / execution duration · Request rate limit · Continuous execution / idle behavior · Retention
Plan controls
- Plan-specific security and compliance
- API key authentication.
3 fields not disclosed
Support · Contractual SLA / availability target · Eligibility and restrictions
Evidence
- Official pricing source
- Official source
- Last checked (UTC date)
- 2026-10-23
- Source interpretation and caveats
- Personal, team and API subscriptions serve different access patterns. A base subscription is not the total monthly bill.
1 fields not disclosed
Price effective date, if explicitly published
Pro
SubscriptionUSD 20/mo
Personal subscription; not the developer API plan
Up to 20 stateful agents; Letta Auto quota; 50 MiB per memory repository.
Pay-as-you-go overage; exact Auto quota not specified here.
Full conditions & limits
Pricing
- Pricing model
- Published
- Base subscription amount (not total cost)
- 20
- Currency
- USD
- Billing interval
- Monthly
- Subscription scope
- Personal subscription; not the developer API plan
- Included usage
- Up to 20 stateful agents; Letta Auto quota; 50 MiB per memory repository.
- Overage rates
- Pay-as-you-go overage; exact Auto quota not specified here.
- Model costs and BYOK conditions
- Model usage is additional. External API keys are supported; provider charges still apply.
5 fields not disclosed
Annual commitment / upfront payment · Setup fee · Free trial / credits / expiry · Cancellation and refunds · Tax treatment
Resources and limits
- Storage and persistence
- 50 MiB per memory repository.
- Agent limit
- Up to 20 stateful agents.
10 fields not disclosed
CPU allocation and billing basis · RAM · GPU / VRAM · Network egress · Concurrency · Execution quota · Maximum session / execution duration · Request rate limit · Continuous execution / idle behavior · Retention
Plan controls
- Eligibility and restrictions
- Personal plan; remote sandboxes supported. API pricing is separate.
3 fields not disclosed
Support · Contractual SLA / availability target · Plan-specific security and compliance
Evidence
- Official pricing source
- Official source
- Last checked (UTC date)
- 2026-10-23
- Source interpretation and caveats
- Personal, team and API subscriptions serve different access patterns. A base subscription is not the total monthly bill.
1 fields not disclosed
Price effective date, if explicitly published
Teams Pro
SubscriptionUSD 20/mo
Per seat per month
Shared agents and team access controls; Letta Auto quota.
Full conditions & limits
Pricing
- Pricing model
- Published
- Base subscription amount (not total cost)
- 20
- Currency
- USD
- Billing interval
- Monthly
- Subscription scope
- Per seat per month
- Included usage
- Shared agents and team access controls; Letta Auto quota.
- Model costs and BYOK conditions
- Model usage is additional. External API keys are supported; provider charges still apply.
6 fields not disclosed
Annual commitment / upfront payment · Setup fee · Overage rates · Free trial / credits / expiry · Cancellation and refunds · Tax treatment
Resources and limits
12 fields not disclosed
CPU allocation and billing basis · RAM · GPU / VRAM · Storage and persistence · Network egress · Agent limit · Concurrency · Execution quota · Maximum session / execution duration · Request rate limit · Continuous execution / idle behavior · Retention
Plan controls
- Eligibility and restrictions
- Team collaboration subscription; not interchangeable with API pricing.
3 fields not disclosed
Support · Contractual SLA / availability target · Plan-specific security and compliance
Evidence
- Official pricing source
- Official source
- Last checked (UTC date)
- 2026-10-23
- Source interpretation and caveats
- Personal, team and API subscriptions serve different access patterns. A base subscription is not the total monthly bill.
1 fields not disclosed
Price effective date, if explicitly published
Enterprise
Custom contractContact sales
Negotiated enterprise contract
Volume-based pricing and increased quotas.
Full conditions & limits
Pricing
- Pricing model
- Contact sales
- Currency
- USD
- Billing interval
- Custom contract
- Subscription scope
- Negotiated enterprise contract
- Included usage
- Volume-based pricing and increased quotas.
- Model costs and BYOK conditions
- Model usage is additional. External API keys are supported; provider charges still apply.
7 fields not disclosed
Base subscription amount (not total cost) · Annual commitment / upfront payment · Setup fee · Overage rates · Free trial / credits / expiry · Cancellation and refunds · Tax treatment
Resources and limits
12 fields not disclosed
CPU allocation and billing basis · RAM · GPU / VRAM · Storage and persistence · Network egress · Agent limit · Concurrency · Execution quota · Maximum session / execution duration · Request rate limit · Continuous execution / idle behavior · Retention
Plan controls
- Support
- Dedicated support.
- Plan-specific security and compliance
- Role-based access control; SAML/OIDC SSO.
2 fields not disclosed
Contractual SLA / availability target · Eligibility and restrictions
Evidence
- Official pricing source
- Official source
- Last checked (UTC date)
- 2026-10-23
- Source interpretation and caveats
- Personal, team and API subscriptions serve different access patterns. A base subscription is not the total monthly bill.
1 fields not disclosed
Price effective date, if explicitly published
Under the hood
Explore the specifications
Open a category for the details. Capabilities may depend on the selected plan.
Company & deploymentService model, use cases and limitations
Company and service
- Official website
- Official source
- Pricing page
- Official source
- Documentation
- Official source
- Hosting category
- Agent runtime
- Deployment model
- Managed cloud; self-hosted App Server is a separate option.
- Best suited to
- Stateful agents, persistent conversation context and agents that use cloud tools.
- Important limitations
- API subscription, active-agent fees, tool execution and model usage are separate charges. Personal Pro and API are different plans. Exact cloud CPU, RAM, regions and concurrency quotas were not disclosed in the reviewed sources.
Compatibility & toolsModels, memory, MCP and integrations
Compatibility and tools
- Frameworks / SDKs
- Letta Agent SDK; Letta App Server. Compatibility with other agent runtimes is not assumed.
- Languages / runtimes
- TypeScript Agent SDK; other language/runtime guarantees not confirmed in these sources.
- Model compatibility
- Model selection and external API keys are supported; availability depends on the selected model provider.
- Bring your own model API key
- Supported
- Memory and sessions
- Persistent agent identity, memory and session history; execution can move between cloud and connected computers.
- MCP: client / server / hosting distinction
- MCP integration documented. Hosting an arbitrary standalone MCP server is not confirmed by these sources.
- Schedules and triggers
- Scheduled agent tasks; Slack integration can deliver messages to cloud agents.
- Browser execution
- Cloud-agent documentation describes tool execution; browser-specific quotas and pricing were not confirmed.
- Code execution / sandbox
- Each cloud conversation can run in an isolated cloud computer. Tool execution is metered in the API plan.
- App integrations / authentication
- GitHub and Slack cloud integrations; credentials configured for the cloud computer.
Infrastructure & operationsRegions, scaling, networking and recovery
Infrastructure and operations
- Available deployment regions
- Not disclosed in reviewed sources.
- Scaling and idle behavior
- Each cloud conversation runs in its own isolated computer. Documentation describes large parallel workloads, but does not publish an account-specific concurrency entitlement.
- Git / deployment workflow
- Web app or Agent SDK with backend cloud and no computer selector: each session receives a managed sandbox. A computer selector uses a registered machine instead.
- Private network / static IP / egress controls
- Private networking, static IP and egress controls: not disclosed in reviewed sources.
- Backups and recovery
- Memory persistence is documented; backup schedule, restore guarantees and recovery objectives were not disclosed.
- Logs, tracing, metrics and evaluations
- Session history is documented; log retention and production monitoring guarantees were not confirmed.
Security & supportIsolation, access controls and support
Security and support
- Isolation model
- Cloud conversations use isolated computers with access to configured resources.
- Secrets management
- Configured cloud secrets; CLI secrets can be injected into tool commands with output scrubbing.
- SSO / roles / audit logging
- Enterprise lists role-based access control and SAML/OIDC SSO; availability in API plan not confirmed.
- Compliance evidence and scope
- No compliance certification scope was confirmed in the reviewed sources.
- Support channels
- Enterprise dedicated support. Public contact: [email protected]; response commitments not disclosed.
Evidence, not assumptions
Sources & verification
Reviewed 2026-10-23 UTC. “Not disclosed” means a value was not confirmed in these sources, not that a capability is unavailable.