diff --git a/cmd/config.go b/cmd/config.go
index 0607f61..5caca37 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -122,7 +122,7 @@ func runInteractiveConfig() {
 	// Dynamically generate available models for OpenAI
 	availableModels := map[string][]string{
 		"openai":  {},
-		"copilot": {"gpt-5-mini"}, // TODO: update if copilot models are dynamic
+		"copilot": {"openai/gpt-5-mini"}, // TODO: update if copilot models are dynamic
 	}
 
 	modelDisplayToID := map[string]string{}
diff --git a/internal/config/config.go b/internal/config/config.go
index 36191a4..6a96550 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/url"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -13,8 +14,8 @@ import (
 )
 
 type ProviderConfig struct {
-	APIKey     string `mapstructure:"api_key"`
-	Model      string `mapstructure:"model"`
+	APIKey      string `mapstructure:"api_key"`
+	Model       string `mapstructure:"model"`
 	EndpointURL string `mapstructure:"endpoint_url"`
 }
 
@@ -37,7 +38,7 @@ func InitConfig() {
 		viper.SetDefault("providers.copilot.model", "openai/gpt-5-mini")
 	} else {
 		viper.SetDefault("active_provider", "openai")
-		viper.SetDefault("providers.openai.model", "gpt-5-mini")
+		viper.SetDefault("providers.openai.model", "openai/gpt-5-mini")
 	}
 
 	viper.AutomaticEnv()
@@ -90,9 +91,6 @@ func GetAPIKey() (string, error) {
 	if cfg == nil {
 		InitConfig()
 	}
-	if cfg.ActiveProvider == "copilot" {
-		return LoadGitHubToken()
-	}
 
 	providerConfig, err := GetActiveProviderConfig()
 	if err != nil {
@@ -213,12 +211,9 @@ func SetEndpoint(provider, endpoint string) error {
 }
 
 func LoadGitHubToken() (string, error) {
-	if token := os.Getenv("GITHUB_TOKEN"); token != "" {
-		return token, nil
-	}
-
-	if token := os.Getenv("GITHUB_MODELS_TOKEN"); token != "" {
-		return token, nil
+	tok, err := tryGetTokenFromGHCLI()
+	if err == nil && tok != "" {
+		return tok, nil
 	}
 
 	configDir := getConfigDir()
@@ -248,20 +243,30 @@ func LoadGitHubToken() (string, error) {
 		}
 	}
 
-	return "", fmt.Errorf("GitHub token not found. Please set GITHUB_TOKEN or GITHUB_MODELS_TOKEN environment variable with a Personal Access Token that has 'models' scope")
+	return "", fmt.Errorf("GitHub token not found via 'gh auth token'; run 'gh auth login' to authenticate the GitHub CLI")
+}
+func tryGetTokenFromGHCLI() (string, error) {
+	out, err := exec.Command("gh", "auth", "token").Output()
+	if err != nil {
+		return "", err
+	}
+	tok := strings.TrimSpace(string(out))
+	if tok == "" {
+		return "", fmt.Errorf("gh returned empty token")
+	}
+	return tok, nil
 }
 
 func getConfigDir() string {
 	if xdgConfig := os.Getenv("XDG_CONFIG_HOME"); xdgConfig != "" {
 		return xdgConfig
-
-	// WARNING: The code is not woking
 	} else if runtime.GOOS == "windows" {
-		if localAppData := os.Getenv("LOCALAPPDATA"); localAppData != "" {
-			return localAppData
-		} else {
-			return filepath.Join(os.Getenv("HOME"), "AppData", "Local")
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			fmt.Println("Error getting user home directory:", err)
+			os.Exit(1)
 		}
+		return filepath.Join(homeDir, "AppData", "Local")
 	} else {
 		return filepath.Join(os.Getenv("HOME"), ".config")
 	}
diff --git a/internal/provider/copilot.go b/internal/provider/copilot.go
index aa6e040..12d8235 100644
--- a/internal/provider/copilot.go
+++ b/internal/provider/copilot.go
@@ -2,7 +2,6 @@ package provider
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"net/http"
 	"os"
@@ -59,39 +58,6 @@ func normalizeCopilotModel(model string) string {
 	return m
 }
 
-func (c *CopilotProvider) exchangeGitHubToken(ctx context.Context, githubToken string) (string, error) {
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://api.github.com/copilot_internal/v2/token", nil)
-	if err != nil {
-		return "", fmt.Errorf("failed creating token request: %w", err)
-	}
-	req.Header.Set("Authorization", "Token "+githubToken)
-	req.Header.Set("User-Agent", "lazycommit/1.0")
-
-	resp, err := c.httpClient.Do(req)
-	if err != nil {
-		return "", fmt.Errorf("failed exchanging token: %w", err)
-	}
-	defer resp.Body.Close()
-	if resp.StatusCode != http.StatusOK {
-		var body struct {
-			Message string `json:"message"`
-		}
-		_ = json.NewDecoder(resp.Body).Decode(&body)
-		return "", fmt.Errorf("token exchange failed: %d %s", resp.StatusCode, body.Message)
-	}
-	var tr struct {
-		Token     string `json:"token"`
-		ExpiresAt int64  `json:"expires_at"`
-	}
-	if err := json.NewDecoder(resp.Body).Decode(&tr); err != nil {
-		return "", fmt.Errorf("failed decoding token response: %w", err)
-	}
-	if tr.Token == "" {
-		return "", fmt.Errorf("empty copilot bearer token")
-	}
-	return tr.Token, nil
-}
-
 func (c *CopilotProvider) getGitHubToken() string {
 	if c.apiKey != "" {
 		return c.apiKey
@@ -122,10 +88,7 @@ func (c *CopilotProvider) GenerateCommitMessages(ctx context.Context, diff strin
 		return nil, fmt.Errorf("GitHub token is required for Copilot provider")
 	}
 
-	bearer, err := c.exchangeGitHubToken(ctx, githubToken)
-	if err != nil {
-		return nil, err
-	}
+	bearer := githubToken
 
 	client := openai.NewClient(
 		option.WithBaseURL(c.endpoint),