diff --git a/interface/src/api/client.ts b/interface/src/api/client.ts
index 6390f6ba3..d88eae00d 100644
--- a/interface/src/api/client.ts
+++ b/interface/src/api/client.ts
@@ -1596,7 +1596,7 @@ export const api = {
 		return response.json() as Promise<Types.ProviderUpdateResponse>;
 	},
 	testProviderModel: async (provider: string, apiKey: string, model: string) => {
-		const response = await fetch(`${getApiBase()}/providers/test`, {
+		const response = await fetch(`${getApiBase()}/providers/test-model`, {
 			method: "POST",
 			headers: { "Content-Type": "application/json" },
 			body: JSON.stringify({ provider, api_key: apiKey, model }),
diff --git a/src/api/providers.rs b/src/api/providers.rs
index 3b923e9b5..319da4fb3 100644
--- a/src/api/providers.rs
+++ b/src/api/providers.rs
@@ -192,6 +192,21 @@ fn build_test_llm_config(provider: &str, credential: &str) -> crate::config::Llm
     let mut providers = HashMap::new();
     if let Some(provider_config) = crate::config::default_provider_config(provider, credential) {
         providers.insert(provider.to_string(), provider_config);
+    } else if provider == "github-copilot" {
+        // GitHub Copilot uses token exchange, so default_provider_config returns None.
+        // For testing, add a provider entry with the PAT as the api_key —
+        // LlmManager::get_copilot_token() will exchange it for a real Copilot token.
+        providers.insert(
+            provider.to_string(),
+            crate::config::ProviderConfig {
+                api_type: crate::config::ApiType::OpenAiChatCompletions,
+                base_url: crate::config::GITHUB_COPILOT_DEFAULT_BASE_URL.to_string(),
+                api_key: credential.to_string(),
+                name: Some("GitHub Copilot".to_string()),
+                use_bearer_auth: true,
+                extra_headers: vec![],
+            },
+        );
     }
 
     crate::config::LlmConfig {
@@ -431,6 +446,15 @@ pub(super) async fn get_providers(
             env_set(env_var)
         };
 
+        // Copilot: only check TOML key, not env var. The env var GITHUB_COPILOT_API_KEY
+        // is a fallback for config loading but shouldn't keep the provider visible in
+        // the settings UI after a remove — the env var can't be unset from the process.
+        let copilot_configured = doc
+            .get("llm")
+            .and_then(|llm| llm.get("github_copilot_key"))
+            .and_then(|val| val.as_str())
+            .is_some_and(|s| resolve_value(s).is_some());
+
         (
             has_value("anthropic_key", "ANTHROPIC_API_KEY"),
             has_value("openai_key", "OPENAI_API_KEY"),
@@ -454,7 +478,7 @@ pub(super) async fn get_providers(
             has_value("minimax_cn_key", "MINIMAX_CN_API_KEY"),
             has_value("moonshot_key", "MOONSHOT_API_KEY"),
             has_value("zai_coding_plan_key", "ZAI_CODING_PLAN_API_KEY"),
-            has_value("github_copilot_key", "GITHUB_COPILOT_API_KEY"),
+            copilot_configured,
         )
     } else {
         (
@@ -794,7 +818,7 @@ pub(super) async fn openai_browser_oauth_status(
 }
 
 #[utoipa::path(
-    post,
+    put,
     path = "/providers",
     request_body = ProviderUpdateRequest,
     responses(
@@ -1083,4 +1107,24 @@ mod tests {
         assert_eq!(provider.base_url, "http://remote-ollama.local:11434");
         assert_eq!(provider.api_key, "");
     }
+
+    #[test]
+    fn build_test_llm_config_registers_github_copilot_provider() {
+        let config = build_test_llm_config("github-copilot", "ghp_test_pat_token");
+        let provider = config
+            .providers
+            .get("github-copilot")
+            .expect("github-copilot provider should be registered");
+
+        assert_eq!(
+            provider.base_url,
+            crate::config::GITHUB_COPILOT_DEFAULT_BASE_URL
+        );
+        assert_eq!(provider.api_key, "ghp_test_pat_token");
+        assert!(provider.use_bearer_auth);
+        assert_eq!(
+            config.github_copilot_key.as_deref(),
+            Some("ghp_test_pat_token")
+        );
+    }
 }
diff --git a/src/config.rs b/src/config.rs
index db0e51b98..80a30aac7 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -18,6 +18,7 @@ pub use permissions::{
     DiscordPermissions, MattermostPermissions, SignalPermissions, SlackPermissions,
     TelegramPermissions, TwitchPermissions,
 };
+pub(crate) use providers::GITHUB_COPILOT_DEFAULT_BASE_URL;
 pub(crate) use providers::default_provider_config;
 pub use runtime::RuntimeConfig;
 pub use types::*;
diff --git a/src/config/providers.rs b/src/config/providers.rs
index 091ca71cc..4216aa152 100644
--- a/src/config/providers.rs
+++ b/src/config/providers.rs
@@ -26,7 +26,7 @@ pub(super) const NVIDIA_PROVIDER_BASE_URL: &str = "https://integrate.api.nvidia.
 pub(super) const FIREWORKS_PROVIDER_BASE_URL: &str = "https://api.fireworks.ai/inference";
 pub(crate) const GEMINI_PROVIDER_BASE_URL: &str =
     "https://generativelanguage.googleapis.com/v1beta/openai";
-pub(super) const GITHUB_COPILOT_DEFAULT_BASE_URL: &str = "https://api.individual.githubcopilot.com";
+pub(crate) const GITHUB_COPILOT_DEFAULT_BASE_URL: &str = "https://api.individual.githubcopilot.com";
 
 /// App attribution headers sent with every OpenRouter API request.
 /// See <https://openrouter.ai/docs/app-attribution>.