Index: internal/config/config.go
--- internal/config/config.go.orig
+++ internal/config/config.go
@@ -178,6 +178,26 @@ func (c *ProviderConfig) SetupGitHubCopilot() {
 	maps.Copy(c.ExtraHeaders, copilot.Headers())
 }
 
+func (c *ProviderConfig) SetupClaudeCode() {
+	c.FlatRate = true
+	c.SystemPromptPrefix = "You are Claude Code, Anthropic's official CLI for Claude."
+	if c.ExtraHeaders == nil {
+		c.ExtraHeaders = make(map[string]string)
+	}
+	c.ExtraHeaders["anthropic-version"] = "2023-06-01"
+	c.ExtraHeaders["User-Agent"] = "claude-code/2.1.112"
+	const want = "oauth-2025-04-20"
+	if v := c.ExtraHeaders["anthropic-beta"]; !strings.Contains(v, want) {
+		if v != "" {
+			v += ","
+		}
+		c.ExtraHeaders["anthropic-beta"] = v + want
+	}
+	if c.APIKey != "" && !strings.HasPrefix(c.APIKey, "Bearer ") {
+		c.APIKey = "Bearer " + c.APIKey
+	}
+}
+
 type MCPType string
 
 const (