Add default, expert, and vision DeepSeek model families

internal/deepseek/client_auth.go

@@ -66,9 +66,7 @@ func (c *Client) CreateSession(ctx context.Context, a *auth.RequestAuth, maxAtte
 		}
 		code, bizCode, msg, bizMsg := extractResponseStatus(resp)
 		if status == http.StatusOK && code == 0 && bizCode == 0 {
-			data, _ := resp["data"].(map[string]any)
-			bizData, _ := data["biz_data"].(map[string]any)
-			sessionID, _ := bizData["id"].(string)
+			sessionID := extractCreateSessionID(resp)
 			if sessionID != "" {
 				return sessionID, nil
 			}
@@ -204,6 +202,22 @@ func isAuthIndicativeBizFailure(msg string, bizMsg string) bool {
 	return false
 }
 
+// DeepSeek has returned create-session ids in both biz_data.id and
+// biz_data.chat_session.id across observed response variants; accept either.
+func extractCreateSessionID(resp map[string]any) string {
+	data, _ := resp["data"].(map[string]any)
+	bizData, _ := data["biz_data"].(map[string]any)
+	if sessionID, _ := bizData["id"].(string); strings.TrimSpace(sessionID) != "" {
+		return strings.TrimSpace(sessionID)
+	}
+	if chatSession, ok := bizData["chat_session"].(map[string]any); ok {
+		if sessionID, _ := chatSession["id"].(string); strings.TrimSpace(sessionID) != "" {
+			return strings.TrimSpace(sessionID)
+		}
+	}
+	return ""
+}
+
 func extractResponseStatus(resp map[string]any) (code int, bizCode int, msg string, bizMsg string) {
 	code = intFrom(resp["code"])
 	msg, _ = resp["msg"].(string)

internal/deepseek/client_auth_test.go

@@ -0,0 +1,34 @@
+package deepseek
+
+import "testing"
+
+func TestExtractCreateSessionIDSupportsLegacyShape(t *testing.T) {
+	resp := map[string]any{
+		"data": map[string]any{
+			"biz_data": map[string]any{
+				"id": "legacy-session-id",
+			},
+		},
+	}
+
+	if got := extractCreateSessionID(resp); got != "legacy-session-id" {
+		t.Fatalf("expected legacy session id, got %q", got)
+	}
+}
+
+func TestExtractCreateSessionIDSupportsNestedChatSessionShape(t *testing.T) {
+	resp := map[string]any{
+		"data": map[string]any{
+			"biz_data": map[string]any{
+				"chat_session": map[string]any{
+					"id":         "nested-session-id",
+					"model_type": "default",
+				},
+			},
+		},
+	}
+
+	if got := extractCreateSessionID(resp); got != "nested-session-id" {
+		t.Fatalf("expected nested session id, got %q", got)
+	}
+}

internal/deepseek/constants.go

@@ -19,11 +19,11 @@ const (
 
 var defaultBaseHeaders = map[string]string{
 	"Host":              "chat.deepseek.com",
-	"User-Agent":        "DeepSeek/1.6.11 Android/35",
+	"User-Agent":        "DeepSeek/1.8.0 Android/35",
 	"Accept":            "application/json",
 	"Content-Type":      "application/json",
 	"x-client-platform": "android",
-	"x-client-version":  "1.6.11",
+	"x-client-version":  "1.8.0",
 	"x-client-locale":   "zh_CN",
 	"accept-charset":    "UTF-8",
 }

internal/deepseek/constants_shared.json

@@ -1,11 +1,11 @@
 {
   "base_headers": {
     "Host": "chat.deepseek.com",
-    "User-Agent": "DeepSeek/1.6.11 Android/35",
+    "User-Agent": "DeepSeek/1.8.0 Android/35",
     "Accept": "application/json",
     "Content-Type": "application/json",
     "x-client-platform": "android",
-    "x-client-version": "1.6.11",
+    "x-client-version": "1.8.0",
     "x-client-locale": "zh_CN",
     "accept-charset": "UTF-8"
   },