Providers

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

When using BYOK authentication, you are billed directly by the LLM API provider at their own rates.

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:

• OpenAI
• Anthropic
• Google Gemini
• Z.ai
• Minimax
• OpenRouter
• Claude on Amazon Bedrock
• Azure OpenAI
• Together AI

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

Codex (ChatGPT Pro / Plus)

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

Authentication

Use the /connect command to authenticate with OpenAI:

> /connect codex

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 codex

zAI GLM Coding Plan

To connect your zAI GLM Coding Plan, simply run /connect, then select zAI to connect your zAI API key.

Minimax Coding Plan

To connect your Minimax Coding Plan, simply run /connect, then select Minimax to connect your Minimax API key.