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Codex CLI Responses API Base URL Setup

· One min read
AI Supermarket
AI Supermarket
AI API Gateway Docs

Codex CLI and Codex Desktop users often search for exact configuration phrases rather than broad AI terms. That makes Codex CLI base_url and Codex CLI Responses API useful niche keywords.

For AI Supermarket, Codex should use the OpenAI-compatible /v1 endpoint:

https://aisupermarket.work/v1

Example config.toml​

model_provider = "OpenAI"
model = "your-model"
review_model = "your-model"
model_reasoning_effort = "high"
disable_response_storage = true

[model_providers.OpenAI]
name = "OpenAI"
base_url = "https://aisupermarket.work/v1"
wire_api = "responses"
requires_openai_auth = true

Example auth.json​

{
  "OPENAI_API_KEY": "your-api-key"
}

Why wire_api = "responses" Matters​

Codex-style workflows often expect the Responses API rather than classic Chat Completions. If your client supports a wire_api field, set it to:

wire_api = "responses"

If you use a model or group that only supports Chat Completions, switch to a compatible group or use a client configuration that explicitly supports Chat Completions.

Debugging Checklist​

  • base_url includes /v1
  • wire_api is set to responses
  • the model exists in your Key group
  • auth.json contains the correct API Key
  • Codex Desktop or the IDE extension was restarted after config changes