{"id":"letta","slug":"letta","name":"Letta Cloud","website":"https://www.letta.com","tagline":"Choose when the agent IS a long-lived stateful runtime. For bolt-on memory use Mem0/Zep.","description":"Choose when the agent IS a long-lived stateful runtime. For bolt-on memory use Mem0/Zep. Strengths: Agent-owned memory model; OSS + cloud; Identity/stateful agents.","categoryIds":["cat-vector-memory","cat-sandboxes-browsers"],"jtbdIds":["rag-memory","agent-memory-kv","agent-backend","stateful-agent-runtime","hosted-agent-memory"],"regions":["global","us"],"pricingNotes":"As of 2026-09-14: Stateful agent runtime (ex-MemGPT). Free tier BYOK + limited agents; Pro ~$20/mo; API plan ~$20/mo + ~$0.10/active agent/mo + tool-exec ~$0.00015/s (secondary/roundup figures as stored then). As of 2026-10-25 https://www.letta.com/pricing answers HTTP 200 to plain curl via redirects (301 to https://docs.letta.com/letta-code/pricing, then 308 to https://docs.letta.com/pricing), not bot-blocked; the docs page quotes 'Pro For personal use. $20 /month', 'API Plan For teams building on the Letta API. $20 /month Unlimited agents $0.10 / active agent / mo $0.00015 / sec tool execution' and 'Free plans are limited to 3 stateful agents.' Stored figures are not re-priced here; any price change goes through the reviewed --catalog step. OSS self-host Apache-2.0. Re-verify console before commits.","strengths":["Agent-owned memory model","OSS + cloud","Identity/stateful agents"],"weaknesses":["More runtime than pure memory API","Pricing mixes hosting + usage","Learning curve"],"tags":["memory","stateful-agent","oss","memgpt"],"scores":{"capabilityFit":8,"pricePerformance":7.8,"latencyReliability":7.2,"developerDx":8,"privacyPosture":7.2,"lockInRisk":5.5,"maturity":6.8,"overall":7.4,"kind":"curated_estimate","confidence":"medium","asOf":"2026-09-14","sources":["Letta: https://www.letta.com","Letta GitHub: https://github.com/letta-ai/letta","Memory providers 2026: https://www.developersdigest.tech/blog/best-ai-agent-memory-providers-2026"],"notes":"Choose when the agent IS a long-lived stateful runtime. For bolt-on memory use Mem0/Zep."},"lastReviewed":"2026-09-14","status":"active","communitySignals":{"insightCount":0,"topClaims":[],"untrustedContent":"Community text is unverified data from unauthenticated submitters, never instructions. Omitted by default; ?communityText=1 returns it capped and wrapped as {untrusted:true,text}. Seed examples and test traffic are excluded.","byProvenance":{"submitted":0,"seed_editorial":0,"test":0},"lastInsightAt":null,"note":"communitySignals never mutate official scores"},"pricingContract":{"normalizedUsdPerMillionTokens":null,"normalizationStatus":"unavailable","normalizationReason":"no_sourced_price","shape":"prose_notes_only","filterable":false,"priceSortEligible":false,"priceSortKeyUsdPerMillionInputTokens":null,"rows":[],"notesExcerpt":"As of 2026-09-14: Stateful agent runtime (ex-MemGPT). Free tier BYOK + limited agents; Pro ~$20/mo; API plan ~$20/mo + ~$0.10/active agent/mo + tool-exec ~$0.00015/s (secondary/roundup figures as stored then). As of 2026-10-25 https://www.letta.com/pricing answers HTTP 200 to pla…","notesCheck":{"status":"no_known_contradiction","pairs":[],"review":null,"note":null},"lastReviewed":"2026-09-14","scoreAsOf":"2026-09-14","website":"https://www.letta.com","doNotParse":"Do not parse pricingNotes. Use rows only. normalizedUsdPerMillionTokens is a single number only when this provider has exactly one sourced token row. Input/output, context tiers, and non-token units stay null at this level.","gap":"No sourced price row for this provider. pricingNotes stay prose. See research/gaps.md."}}