feat: add Alibaba Cloud provider and Anthropic base_url override (#1673)

Add Alibaba Cloud (DashScope) as a first-class inference provider
using the Anthropic-compatible endpoint. This gives access to Qwen
models (qwen3.5-plus, qwen3-max, qwen3-coder-plus, etc.) through
the same api_mode as native Anthropic.

Also add ANTHROPIC_BASE_URL env var support so users can point the
Anthropic provider at any compatible endpoint.

Changes:
- auth.py: Add alibaba ProviderConfig + ANTHROPIC_BASE_URL on anthropic
- models.py: Add alibaba to catalog, labels, aliases (dashscope/aliyun/qwen), provider order
- runtime_provider.py: Add alibaba resolution (anthropic_messages api_mode) + ANTHROPIC_BASE_URL
- model_metadata.py: Add Qwen model context lengths (128K)
- config.py: Add DASHSCOPE_API_KEY, DASHSCOPE_BASE_URL, ANTHROPIC_BASE_URL env vars

Usage:
  hermes --provider alibaba --model qwen3.5-plus
  # or via aliases:
  hermes --provider qwen --model qwen3-max

hermes_cli/auth.py

@@ -138,6 +138,15 @@ PROVIDER_REGISTRY: Dict[str, ProviderConfig] = {
         auth_type="api_key",
         inference_base_url="https://api.anthropic.com",
         api_key_env_vars=("ANTHROPIC_API_KEY", "ANTHROPIC_TOKEN", "CLAUDE_CODE_OAUTH_TOKEN"),
+        base_url_env_var="ANTHROPIC_BASE_URL",
+    ),
+    "alibaba": ProviderConfig(
+        id="alibaba",
+        name="Alibaba Cloud (DashScope)",
+        auth_type="api_key",
+        inference_base_url="https://dashscope-intl.aliyuncs.com/apps/anthropic",
+        api_key_env_vars=("DASHSCOPE_API_KEY",),
+        base_url_env_var="DASHSCOPE_BASE_URL",
     ),
     "minimax-cn": ProviderConfig(
         id="minimax-cn",

hermes_cli/config.py

@@ -492,6 +492,29 @@ OPTIONAL_ENV_VARS = {
         "password": False,
         "category": "provider",
     },
+    "ANTHROPIC_BASE_URL": {
+        "description": "Custom Anthropic-compatible API base URL (e.g. Alibaba Cloud DashScope)",
+        "prompt": "Anthropic Base URL",
+        "url": "",
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
+    "DASHSCOPE_API_KEY": {
+        "description": "Alibaba Cloud DashScope API key for Qwen models",
+        "prompt": "DashScope API Key",
+        "url": "https://modelstudio.console.alibabacloud.com/",
+        "password": True,
+        "category": "provider",
+    },
+    "DASHSCOPE_BASE_URL": {
+        "description": "Custom DashScope base URL (default: international endpoint)",
+        "prompt": "DashScope Base URL",
+        "url": "",
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
     "OPENCODE_ZEN_API_KEY": {
         "description": "OpenCode Zen API key (pay-as-you-go access to curated models)",
         "prompt": "OpenCode Zen API key",

hermes_cli/models.py

@@ -146,6 +146,15 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "google/gemini-3-pro-preview",
         "google/gemini-3-flash-preview",
     ],
+    "alibaba": [
+        "qwen3.5-plus",
+        "qwen3-max",
+        "qwen3-coder-plus",
+        "qwen3-coder-next",
+        "qwen-plus-latest",
+        "qwen3.5-flash",
+        "qwen-vl-max",
+    ],
 }
 
 _PROVIDER_LABELS = {
@@ -162,6 +171,7 @@ _PROVIDER_LABELS = {
     "opencode-go": "OpenCode Go",
     "ai-gateway": "AI Gateway",
     "kilocode": "Kilo Code",
+    "alibaba": "Alibaba Cloud (DashScope)",
     "custom": "Custom endpoint",
 }
 
@@ -187,6 +197,10 @@ _PROVIDER_ALIASES = {
     "kilo": "kilocode",
     "kilo-code": "kilocode",
     "kilo-gateway": "kilocode",
+    "dashscope": "alibaba",
+    "aliyun": "alibaba",
+    "qwen": "alibaba",
+    "alibaba-cloud": "alibaba",
 }
 
 
@@ -220,7 +234,7 @@ def list_available_providers() -> list[dict[str, str]]:
     # Canonical providers in display order
     _PROVIDER_ORDER = [
         "openrouter", "nous", "openai-codex",
-        "zai", "kimi-coding", "minimax", "minimax-cn", "kilocode", "anthropic",
+        "zai", "kimi-coding", "minimax", "minimax-cn", "kilocode", "anthropic", "alibaba",
         "opencode-zen", "opencode-go",
         "ai-gateway", "deepseek", "custom",
     ]

hermes_cli/runtime_provider.py

@@ -276,15 +276,30 @@ def resolve_runtime_provider(
                 "No Anthropic credentials found. Set ANTHROPIC_TOKEN or ANTHROPIC_API_KEY, "
                 "run 'claude setup-token', or authenticate with 'claude /login'."
             )
+        # Support custom Anthropic-compatible endpoints via ANTHROPIC_BASE_URL
+        base_url = os.getenv("ANTHROPIC_BASE_URL", "").strip() or "https://api.anthropic.com"
         return {
             "provider": "anthropic",
             "api_mode": "anthropic_messages",
-            "base_url": "https://api.anthropic.com",
+            "base_url": base_url,
             "api_key": token,
             "source": "env",
             "requested_provider": requested_provider,
         }
 
+    # Alibaba Cloud / DashScope (Anthropic-compatible endpoint)
+    if provider == "alibaba":
+        creds = resolve_api_key_provider_credentials(provider)
+        base_url = creds.get("base_url", "").rstrip("/") or "https://dashscope-intl.aliyuncs.com/apps/anthropic"
+        return {
+            "provider": "alibaba",
+            "api_mode": "anthropic_messages",
+            "base_url": base_url,
+            "api_key": creds.get("api_key", ""),
+            "source": creds.get("source", "env"),
+            "requested_provider": requested_provider,
+        }
+
     # API-key providers (z.ai/GLM, Kimi, MiniMax, MiniMax-CN)
     pconfig = PROVIDER_REGISTRY.get(provider)
     if pconfig and pconfig.auth_type == "api_key":