feat: honor OPENAI_BASE_URL for the built-in openai provider (#1487)

Some users have proxies or other setups where they are ultimately
hitting OpenAI endpoints, but need a custom `base_url` rather than the
default value of `"https://api.openai.com/v1"`. This PR makes it
possible to override the `base_url` for the `openai` provider via the
`OPENAI_BASE_URL` environment variable.

codex-rs/config.md

@@ -94,15 +94,15 @@ env_http_headers = { "X-Example-Features": "EXAMPLE_FEATURES" }
 
 ## model_provider
 
-Identifies which provider to use from the `model_providers` map. Defaults to `"openai"`.
+Identifies which provider to use from the `model_providers` map. Defaults to `"openai"`. You can override the `base_url` for the built-in `openai` provider via the `OPENAI_BASE_URL` environment variable.
 
 Note that if you override `model_provider`, then you likely want to override
 `model`, as well. For example, if you are running ollama with Mistral locally,
 then you would need to add the following to your config in addition to the new entry in the `model_providers` map:
 
 ```toml
-model = "mistral"
 model_provider = "ollama"
+model = "mistral"
 ```
 
 ## approval_policy

codex-rs/core/src/model_provider_info.rs

@@ -176,7 +176,15 @@ pub fn built_in_model_providers() -> HashMap<String, ModelProviderInfo> {
             "openai",
             P {
                 name: "OpenAI".into(),
-                base_url: "https://api.openai.com/v1".into(),
+                // Allow users to override the default OpenAI endpoint by
+                // exporting `OPENAI_BASE_URL`. This is useful when pointing
+                // Codex at a proxy, mock server, or Azure-style deployment
+                // without requiring a full TOML override for the built-in
+                // OpenAI provider.
+                base_url: std::env::var("OPENAI_BASE_URL")
+                    .ok()
+                    .filter(|v| !v.trim().is_empty())
+                    .unwrap_or_else(|| "https://api.openai.com/v1".to_string()),
                 env_key: Some("OPENAI_API_KEY".into()),
                 env_key_instructions: Some("Create an API key (https://platform.openai.com) and export it as an environment variable.".into()),
                 wire_api: WireApi::Responses,