Codex

A Codex custom provider uses the Responses API. Select a Flex247 model that supports /v1/responses.

1. Set the API key

Windows PowerShell

$env:FLEX247_API_KEY = "sk-your-flex247-key"

macOS / Linux

export FLEX247_API_KEY="sk-your-flex247-key"

2. Edit config.toml

User-level configuration is stored at:

• Windows: %USERPROFILE%\.codex\config.toml
• macOS / Linux: ~/.codex/config.toml

Add:

model = "your-responses-model-id"
model_provider = "flex247"
model_reasoning_effort = "medium"

[model_providers.flex247]
name = "Flex247"
base_url = "https://api.noflex.work/v1"
env_key = "FLEX247_API_KEY"
wire_api = "responses"

Model requirement

Codex custom providers currently use responses as the wire API. Use a Responses-compatible model from Model Square.

3. Start and verify

From a test project directory, run:

codex

Ask Codex to list the current directory without modifying files, then confirm the request in Flex247 Usage Logs.

Troubleshooting

Missing environment variable

Set FLEX247_API_KEY in the same terminal that launches Codex.

404 or Responses error

Verify base_url = "https://api.noflex.work/v1" and select a Responses-compatible model.

Configuration does not apply

Provider, authentication and Base URL settings belong in user-level config.toml, not only in a project .codex/config.toml.