feat(cli): collapse regional duplicates; refresh Qwen catalog

Qwen and MiniMax each had two main-dropdown entries (intl + CN);
consolidate to one entry per provider and prompt for region as a
secondary step. Internal provider keys (qwen-cn, minimax-cn) and
endpoint routing unchanged. Add qwen3.6-flash to the Qwen catalog
and drop the version-less aliases (qwen-flash, qwen-plus) that
auto-shift their backing model per Alibaba's docs.

#758

cli/main.py

@@ -559,6 +559,14 @@ def get_user_selections():
     )
     selected_llm_provider, backend_url = select_llm_provider()
 
+    # Providers with regional endpoints prompt for the region as a secondary
+    # step so the main dropdown stays clean (mainland China and international
+    # accounts cannot share API keys).
+    if selected_llm_provider == "qwen":
+        selected_llm_provider, backend_url = ask_qwen_region()
+    elif selected_llm_provider == "minimax":
+        selected_llm_provider, backend_url = ask_minimax_region()
+
     # Step 7: Thinking agents
     console.print(
         create_question_box(

cli/utils.py

@@ -237,10 +237,9 @@ def select_llm_provider() -> tuple[str, str | None]:
         ("Anthropic", "anthropic", "https://api.anthropic.com/"),
         ("xAI", "xai", "https://api.x.ai/v1"),
         ("DeepSeek", "deepseek", "https://api.deepseek.com"),
-        ("Qwen", "qwen", "https://dashscope.aliyuncs.com/compatible-mode/v1"),
+        ("Qwen", "qwen", "https://dashscope-intl.aliyuncs.com/compatible-mode/v1"),
         ("GLM", "glm", "https://open.bigmodel.cn/api/paas/v4/"),
         ("MiniMax", "minimax", "https://api.minimax.io/v1"),
-        ("MiniMax CN", "minimax-cn", "https://api.minimaxi.com/v1"),
         ("OpenRouter", "openrouter", "https://openrouter.ai/api/v1"),
         ("Azure OpenAI", "azure", None),
         ("Ollama", "ollama", "http://localhost:11434/v1"),
@@ -330,6 +329,60 @@ def ask_gemini_thinking_config() -> str | None:
     ).ask()
 
 
+def ask_qwen_region() -> tuple[str, str]:
+    """Ask which Qwen region (international vs China) to use.
+
+    Alibaba DashScope exposes two endpoints with separate accounts —
+    a key from one region does NOT authenticate against the other
+    (fixes #758). Returns (provider_key, backend_url).
+    """
+    return questionary.select(
+        "Select Qwen region:",
+        choices=[
+            questionary.Choice(
+                "International — dashscope-intl.aliyuncs.com (uses DASHSCOPE_API_KEY)",
+                value=("qwen", "https://dashscope-intl.aliyuncs.com/compatible-mode/v1"),
+            ),
+            questionary.Choice(
+                "China — dashscope.aliyuncs.com (uses DASHSCOPE_CN_API_KEY)",
+                value=("qwen-cn", "https://dashscope.aliyuncs.com/compatible-mode/v1"),
+            ),
+        ],
+        style=questionary.Style([
+            ("selected", "fg:cyan noinherit"),
+            ("highlighted", "fg:cyan noinherit"),
+            ("pointer", "fg:cyan noinherit"),
+        ]),
+    ).ask()
+
+
+def ask_minimax_region() -> tuple[str, str]:
+    """Ask which MiniMax region (global vs China) to use.
+
+    MiniMax exposes two endpoints with separate accounts — a key from
+    one region does NOT authenticate against the other. Returns
+    (provider_key, backend_url).
+    """
+    return questionary.select(
+        "Select MiniMax region:",
+        choices=[
+            questionary.Choice(
+                "Global — api.minimax.io (uses MINIMAX_API_KEY)",
+                value=("minimax", "https://api.minimax.io/v1"),
+            ),
+            questionary.Choice(
+                "China — api.minimaxi.com (uses MINIMAX_CN_API_KEY)",
+                value=("minimax-cn", "https://api.minimaxi.com/v1"),
+            ),
+        ],
+        style=questionary.Style([
+            ("selected", "fg:cyan noinherit"),
+            ("highlighted", "fg:cyan noinherit"),
+            ("pointer", "fg:cyan noinherit"),
+        ]),
+    ).ask()
+
+
 def ask_output_language() -> str:
     """Ask for report output language."""
     choice = questionary.select(

tradingagents/llm_clients/model_catalog.py

@@ -8,6 +8,31 @@ ModelOption = Tuple[str, str]
 ProviderModeOptions = Dict[str, Dict[str, List[ModelOption]]]
 
 
+# Shared model list for Qwen's global (dashscope-intl) and CN (dashscope) endpoints.
+# Source: modelstudio.console.alibabacloud.com (Featured Models — Flagship + Cost-optimized).
+#
+# Only versioned IDs are exposed in the dropdown. The version-less aliases
+# (qwen-plus, qwen-flash) are documented by Alibaba as auto-upgrading
+# pointers ("backbone, latest, and snapshot ... have been upgraded to the
+# Qwen3 series"), which means their behavior shifts when Alibaba rotates
+# the backing model. Users who want a specific generation pick it
+# explicitly; users who really want auto-latest can enter the alias via
+# "Custom model ID".
+_QWEN_MODELS: Dict[str, List[ModelOption]] = {
+    "quick": [
+        ("Qwen 3.6 Flash - Latest fast, agentic coding + vision-language", "qwen3.6-flash"),
+        ("Qwen 3.5 Flash - Previous-gen fast", "qwen3.5-flash"),
+        ("Custom model ID", "custom"),
+    ],
+    "deep": [
+        ("Qwen 3.6 Plus - Flagship vision-language, agentic coding SOTA", "qwen3.6-plus"),
+        ("Qwen 3.5 Plus - Previous-gen flagship", "qwen3.5-plus"),
+        ("Qwen 3 Max - Specialized for agent programming + tool use", "qwen3-max"),
+        ("Custom model ID", "custom"),
+    ],
+}
+
+
 # Shared model list for MiniMax's global and CN endpoints (same IDs).
 # Full official lineup per platform.minimax.io/docs/api-reference/text-openai-api.
 # All M2.x models share a 204,800-token context window.
@@ -97,19 +122,10 @@ MODEL_OPTIONS: ProviderModeOptions = {
             ("Custom model ID", "custom"),
         ],
     },
-    "qwen": {
-        "quick": [
-            ("Qwen 3.5 Flash", "qwen3.5-flash"),
-            ("Qwen Plus", "qwen-plus"),
-            ("Custom model ID", "custom"),
-        ],
-        "deep": [
-            ("Qwen 3.6 Plus", "qwen3.6-plus"),
-            ("Qwen 3.5 Plus", "qwen3.5-plus"),
-            ("Qwen 3 Max", "qwen3-max"),
-            ("Custom model ID", "custom"),
-        ],
-    },
+    # Qwen: same model IDs across global (dashscope-intl) and China
+    # (dashscope) endpoints, so the two provider keys share one model list.
+    "qwen": _QWEN_MODELS,
+    "qwen-cn": _QWEN_MODELS,
     "glm": {
         "quick": [
             ("GLM-4.7", "glm-4.7"),