Providers

Features

Model providers and plans supported by Letta Code

Letta API

The Letta API supports a wide range of model providers, including OpenAI, Anthropic, Google Gemini, zAI, and more (view the full list of available models). Users on a Letta Pro Plan or Letta Max Plan can directly access any model on the Letta API through their subscription, and pay for additional usage via pay-as-you-go credits (view usage page to configure auto top-up).

BYOK authentication

You can also add your own LLM API provider keys via the /connect command. This allows you to use your own API keys for the following providers:

You can also use Letta Code with existing OpenAI ChatGPT Pro/Plus plans (includes Codex usage), the zAI Coding Plan, and the Minimax Coding Plan.

Local mode providers

Local mode uses the same /connect flow, but stores provider configuration in the embedded local backend. This is useful when you want local agent state, local inference, or both.

Inside a local Letta Code session, run:

> /connect

From the shell, pass --backend local before connect:

letta --backend local connect ollama
letta --backend local connect lmstudio --base-url http://127.0.0.1:1234/v1
letta --backend local connect llama-cpp --base-url http://localhost:8080/v1

Local mode can also use remote providers such as Anthropic, OpenAI, Gemini, OpenRouter, Bedrock, and ChatGPT/Codex. In that setup, agent state stays local, but prompts still go to the remote model provider.

ChatGPT Pro / Plus (Codex OAuth)

Connect your ChatGPT Pro / Plus subscription to use OpenAI models with your existing plan.

Authentication

Use the /connect command to authenticate with OpenAI:

> /connect chatgpt

/connect codex remains supported as an alias.

This will open a browser window to authorize Letta Code with your OpenAI account. Once connected, your ChatGPT Pro / Plus plan quota will be used for OpenAI models with the provider name chatgpt-pro-plus. To disconnect from your OpenAI account, you can run:

> /disconnect chatgpt

/disconnect codex remains supported as an alias.

zAI Coding Plan

To connect your zAI Coding Plan, run:

> /connect zai-coding

If you want to use a standard zAI API key instead, run:

> /connect zai

Minimax Coding Plan

Connect your Minimax Coding Plan to use MiniMax models with your existing plan.

Authentication

Use the /connect command with your Minimax API key:

> /connect minimax <api_key>

Once connected, your Minimax Coding Plan quota will be used for MiniMax models. To disconnect from your Minimax account, you can run:

> /disconnect minimax