--- internal/config/config.go
+++ internal/config/config.go
@@ -177,6 +177,22 @@ 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"
+	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
+	}
+}
+
 type MCPType string