Codex CLI

Codex CLI connects through the FUNCD Responses API. Configure the API URL, model ID, and environment variable name.

Configure the FUNCD provider

Save the following in your user-level ~/.codex/config.toml:

model = "tokener-gpt-5-6-luna"
model_provider = "funcd"

[model_providers.funcd]
name = "FUNCD"
base_url = "https://api.funcd.org/v1"
env_key = "FUNCD_API_KEY"
wire_api = "responses"

Provide the key through an environment variable:

export FUNCD_API_KEY="pk_live_..."
codex

Choose another model for one run:

codex -m tokener-gpt-5-6-luna

Base URL

Set base_url to https://api.funcd.org/v1. Codex appends POST /responses; do not add /responses yourself.

Requirements

• The key must allow the selected model.
• The account balance and key spending limit must be sufficient.
• The selected upstream model must support the Responses API.
• Keep the token in FUNCD_API_KEY, not in config.toml.

FUNCD has verified standard Responses, streaming output, and function tools with tokener-gpt-5-6-luna. Test other models with the Responses example first.