fix: remove hardcoded OpenRouter/opus defaults

No model, base_url, or provider is assumed when the user hasn't
configured one.  Previously the defaults dict in cli.py, AIAgent
constructor args, and several fallback paths all hardcoded
anthropic/claude-opus-4.6 + openrouter.ai/api/v1 — silently routing
unconfigured users to OpenRouter, which 404s for anyone using a
different provider.

Now empty defaults force the setup wizard to run, and existing users
who already completed setup are unaffected (their config.yaml has
the model they chose).

Files changed:
- cli.py: defaults dict, _DEFAULT_CONFIG_MODEL
- run_agent.py: AIAgent.__init__ defaults, main() defaults
- hermes_cli/config.py: DEFAULT_CONFIG
- hermes_cli/runtime_provider.py: is_fallback sentinel
- acp_adapter/session.py: default_model
- tests: updated to reflect empty defaults

acp_adapter/session.py

@@ -426,7 +426,7 @@ class SessionManager:
 
         config = load_config()
         model_cfg = config.get("model")
-        default_model = "anthropic/claude-opus-4.6"
+        default_model = ""
         config_provider = None
         if isinstance(model_cfg, dict):
             default_model = str(model_cfg.get("default") or default_model)

cli.py

@@ -144,8 +144,8 @@ def load_cli_config() -> Dict[str, Any]:
     # Default configuration
     defaults = {
         "model": {
-            "default": "anthropic/claude-opus-4.6",
+            "default": "",
-            "base_url": OPENROUTER_BASE_URL,
+            "base_url": "",
             "provider": "auto",
         },
         "terminal": {
@@ -1103,7 +1103,7 @@ class HermesCLI:
         # env vars would stomp each other.
         _model_config = CLI_CONFIG.get("model", {})
         _config_model = (_model_config.get("default") or _model_config.get("model") or "") if isinstance(_model_config, dict) else (_model_config or "")
-        _DEFAULT_CONFIG_MODEL = "anthropic/claude-opus-4.6"
+        _DEFAULT_CONFIG_MODEL = ""
         self.model = model or _config_model or _DEFAULT_CONFIG_MODEL
         # Auto-detect model from local server if still on default
         if self.model == _DEFAULT_CONFIG_MODEL:

hermes_cli/config.py

@@ -196,7 +196,7 @@ def ensure_hermes_home():
 # =============================================================================
 
 DEFAULT_CONFIG = {
-    "model": "anthropic/claude-opus-4.6",
+    "model": "",
     "fallback_providers": [],
     "credential_pool_strategies": {},
     "toolsets": ["hermes-cli"],

hermes_cli/runtime_provider.py

@@ -71,7 +71,7 @@ def _get_model_config() -> Dict[str, Any]:
         default = (cfg.get("default") or "").strip()
         base_url = (cfg.get("base_url") or "").strip()
         is_local = "localhost" in base_url or "127.0.0.1" in base_url
-        is_fallback = not default or default == "anthropic/claude-opus-4.6"
+        is_fallback = not default
         if is_local and is_fallback and base_url:
             detected = _auto_detect_local_model(base_url)
             if detected:

run_agent.py

@@ -471,7 +471,7 @@ class AIAgent:
         acp_args: list[str] | None = None,
         command: str = None,
         args: list[str] | None = None,
-        model: str = "anthropic/claude-opus-4.6",  # OpenRouter format
+        model: str = "",
         max_iterations: int = 90,  # Default tool-calling iterations (shared with subagents)
         tool_delay: float = 1.0,
         enabled_toolsets: List[str] = None,
@@ -586,10 +586,9 @@ class AIAgent:
         self.log_prefix_chars = log_prefix_chars
         self.log_prefix = f"{log_prefix} " if log_prefix else ""
         # Store effective base URL for feature detection (prompt caching, reasoning, etc.)
-        # When no base_url is provided, the client defaults to OpenRouter, so reflect that here.
+        self.base_url = base_url or ""
-        self.base_url = base_url or OPENROUTER_BASE_URL
         provider_name = provider.strip().lower() if isinstance(provider, str) and provider.strip() else None
-        self.provider = provider_name or "openrouter"
+        self.provider = provider_name or ""
         self.acp_command = acp_command or command
         self.acp_args = list(acp_args or args or [])
         if api_mode in {"chat_completions", "codex_responses", "anthropic_messages"}:
@@ -8520,9 +8519,9 @@ class AIAgent:
 
 def main(
     query: str = None,
-    model: str = "anthropic/claude-opus-4.6",
+    model: str = "",
     api_key: str = None,
-    base_url: str = "https://openrouter.ai/api/v1",
+    base_url: str = "",
     max_turns: int = 10,
     enabled_toolsets: str = None,
     disabled_toolsets: str = None,

tests/test_api_key_providers.py

@@ -704,14 +704,14 @@ class TestHasAnyProviderConfigured:
         assert _has_any_provider_configured() is True
 
     def test_config_dict_no_provider_no_creds_still_false(self, monkeypatch, tmp_path):
-        """config.yaml model dict with only 'default' key and no creds stays false."""
+        """config.yaml model dict with empty default and no creds stays false."""
         import yaml
         from hermes_cli import config as config_module
         hermes_home = tmp_path / ".hermes"
         hermes_home.mkdir()
         config_file = hermes_home / "config.yaml"
         config_file.write_text(yaml.dump({
-            "model": {"default": "anthropic/claude-opus-4.6"},
+            "model": {"default": ""},
         }))
         monkeypatch.setattr(config_module, "get_env_path", lambda: hermes_home / ".env")
         monkeypatch.setattr(config_module, "get_hermes_home", lambda: hermes_home)

tests/test_codex_models.py

@@ -187,12 +187,12 @@ class TestNormalizeModelForProvider:
         assert cli.model == "claude-opus-4.6"
 
     def test_default_model_replaced(self):
-        """The untouched default (anthropic/claude-opus-4.6) gets swapped."""
+        """No model configured (empty default) gets swapped for codex."""
         import cli as _cli_mod
         _clean_config = {
             "model": {
-                "default": "anthropic/claude-opus-4.6",
+                "default": "",
-                "base_url": "https://openrouter.ai/api/v1",
+                "base_url": "",
                 "provider": "auto",
             },
             "display": {"compact": False, "tool_progress": "all", "resume_display": "full"},
@@ -219,12 +219,12 @@ class TestNormalizeModelForProvider:
         assert cli.model == "gpt-5.3-codex"
 
     def test_default_fallback_when_api_fails(self):
-        """Default model falls back to gpt-5.3-codex when API unreachable."""
+        """No model configured falls back to gpt-5.3-codex when API unreachable."""
         import cli as _cli_mod
         _clean_config = {
             "model": {
-                "default": "anthropic/claude-opus-4.6",
+                "default": "",
-                "base_url": "https://openrouter.ai/api/v1",
+                "base_url": "",
                 "provider": "auto",
             },
             "display": {"compact": False, "tool_progress": "all", "resume_display": "full"},