Alternatives

Letta / MemGPT alternatives in 2026 (Zep, Mem0, Cognee, Anthropic Memory, OpenAI Memory)

Top Letta alternatives in 2026: Zep (production memory layer), Mem0 (developer-friendly), Cognee (graph), Anthropic Memory (Claude-native), OpenAI Memory (ChatGPT-native).

Why people search this

People look for Letta / MemGPT alternatives because they want production-grade memory (Zep), developer-friendly DX (Mem0), graph-based memory (Cognee), or provider-native memory (Anthropic, OpenAI).

The ranking

Zep

Best for: Production agent memory, temporal facts, knowledge graph · Price: Per-seat / per-mem-op

Production memory layer for AI agents with temporal facts and Graphiti knowledge graph.

Read our deep dive →

Mem0

Best for: Production agent memory with strong DX · Price: Free OSS + paid cloud

Developer-friendly memory layer with multi-level memory and strong DX.

Cognee

Best for: Graph-based agent memory · Price: Free OSS + paid

Graph-based memory pipeline — extract, cognify, load.

Anthropic Memory

Best for: Claude-native stacks · Price: Included in Claude usage

Provider-native memory for Claude Projects + apps.

OpenAI Memory

Best for: ChatGPT-native stacks · Price: Included in ChatGPT Plus / API

Provider-native memory for ChatGPT.

FAQ

Best Letta alternative for production?

Zep or Mem0 — both production-grade with stronger ergonomics than Letta for typical agent workloads.

Best OSS alternative?

Mem0 (OSS + cloud) or Cognee (graph-based OSS).

Best provider-native?

Anthropic Memory for Claude; OpenAI Memory for ChatGPT.

Last updated: 2026-06-01.