Claude Code memory proxy

This is an experimental proxy service currently in trial. Join our Discord for support and feedback.

Add persistent Letta memory to your Claude Code instance. Claude becomes a persistent entity across every session, similar to CLAUDE.md but passively managed with a customizable memory architecture.

How it works

1. You set your Anthropic base URL to point to the Letta proxy (https://api.letta.com/v1/anthropic)
2. Letta captures your requests and prepends a Claude Code-specific agent’s memory blocks to the prompt
3. Anthropic processes the request and returns the response
4. A Letta sleeptime agent processes the conversation and performs memory operations in the background

This gives Claude persistent memory that improves over time. You get a single agent across all Claude Code instances, meaning Claude is personalized to you wherever you start it.

Requirements

• A Letta Developer Platform account and API key
• A Claude Code subscription (Max/Pro) or Anthropic API key
• Letta credits for sleeptime memory operations (free tier includes $5/month)

Your Claude Code key (OAuth for Max/Pro plans, or raw API key) is used for inference with Anthropic. Letta credits are only used for the background memory operations.

Setup

Set these environment variables before starting Claude Code:

export ANTHROPIC_BASE_URL=https://api.letta.com/v1/anthropic
export ANTHROPIC_AUTH_TOKEN=<your-letta-api-key>

Then start Claude Code:

claude

Or run it all in one line:

ANTHROPIC_BASE_URL=https://api.letta.com/v1/anthropic ANTHROPIC_AUTH_TOKEN=sk-let-... claude

You should start noticing Claude accumulating memory. Try asking it what memory blocks it has available.

Specifying an agent

By default, Letta creates and uses a single agent for all your Claude Code sessions. To use a specific agent:

export ANTHROPIC_CUSTOM_HEADERS="X-LETTA-AGENT-ID:agent-xxx"

z.ai integration

If you use the z.ai coding plan through Claude Code, set these environment variables instead:

export ANTHROPIC_BASE_URL=https://api.letta.com/v1/zai
export ANTHROPIC_AUTH_TOKEN=<your-letta-api-key>
export ANTHROPIC_API_KEY=<your-zai-api-key>

Feedback

This is a proof of concept and we’re actively improving observability and ease of use. Join our Discord to share feedback.