diff --git a/hermes_cli/auth.py b/hermes_cli/auth.py
index 3a80780f..293f91e0 100644
--- a/hermes_cli/auth.py
+++ b/hermes_cli/auth.py
@@ -145,7 +145,7 @@ PROVIDER_REGISTRY: Dict[str, ProviderConfig] = {
         id="minimax",
         name="MiniMax",
         auth_type="api_key",
-        inference_base_url="https://api.minimax.io/v1",
+        inference_base_url="https://api.minimax.io/anthropic",
         api_key_env_vars=("MINIMAX_API_KEY",),
         base_url_env_var="MINIMAX_BASE_URL",
     ),
@@ -168,7 +168,7 @@ PROVIDER_REGISTRY: Dict[str, ProviderConfig] = {
         id="minimax-cn",
         name="MiniMax (China)",
         auth_type="api_key",
-        inference_base_url="https://api.minimaxi.com/v1",
+        inference_base_url="https://api.minimaxi.com/anthropic",
         api_key_env_vars=("MINIMAX_CN_API_KEY",),
         base_url_env_var="MINIMAX_CN_BASE_URL",
     ),
diff --git a/hermes_cli/runtime_provider.py b/hermes_cli/runtime_provider.py
index ed9e2854..b00db5cf 100644
--- a/hermes_cli/runtime_provider.py
+++ b/hermes_cli/runtime_provider.py
@@ -387,6 +387,12 @@ def resolve_runtime_provider(
             # (e.g. https://api.minimax.io/anthropic, https://dashscope.../anthropic)
             elif base_url.rstrip("/").endswith("/anthropic"):
                 api_mode = "anthropic_messages"
+            # MiniMax providers always use Anthropic Messages API.
+            # Auto-correct stale /v1 URLs (from old .env or config) to /anthropic.
+            elif provider in ("minimax", "minimax-cn"):
+                api_mode = "anthropic_messages"
+                if base_url.rstrip("/").endswith("/v1"):
+                    base_url = base_url.rstrip("/")[:-3] + "/anthropic"
         return {
             "provider": provider,
             "api_mode": api_mode,
diff --git a/tests/test_api_key_providers.py b/tests/test_api_key_providers.py
index 1bb91eef..95d18bdd 100644
--- a/tests/test_api_key_providers.py
+++ b/tests/test_api_key_providers.py
@@ -92,8 +92,8 @@ class TestProviderRegistry:
         assert PROVIDER_REGISTRY["copilot-acp"].inference_base_url == "acp://copilot"
         assert PROVIDER_REGISTRY["zai"].inference_base_url == "https://api.z.ai/api/paas/v4"
         assert PROVIDER_REGISTRY["kimi-coding"].inference_base_url == "https://api.moonshot.ai/v1"
-        assert PROVIDER_REGISTRY["minimax"].inference_base_url == "https://api.minimax.io/v1"
-        assert PROVIDER_REGISTRY["minimax-cn"].inference_base_url == "https://api.minimaxi.com/v1"
+        assert PROVIDER_REGISTRY["minimax"].inference_base_url == "https://api.minimax.io/anthropic"
+        assert PROVIDER_REGISTRY["minimax-cn"].inference_base_url == "https://api.minimaxi.com/anthropic"
         assert PROVIDER_REGISTRY["ai-gateway"].inference_base_url == "https://ai-gateway.vercel.sh/v1"
         assert PROVIDER_REGISTRY["kilocode"].inference_base_url == "https://api.kilo.ai/api/gateway"
 
@@ -399,14 +399,14 @@ class TestResolveApiKeyProviderCredentials:
         creds = resolve_api_key_provider_credentials("minimax")
         assert creds["provider"] == "minimax"
         assert creds["api_key"] == "mm-secret-key"
-        assert creds["base_url"] == "https://api.minimax.io/v1"
+        assert creds["base_url"] == "https://api.minimax.io/anthropic"
 
     def test_resolve_minimax_cn_with_key(self, monkeypatch):
         monkeypatch.setenv("MINIMAX_CN_API_KEY", "mmcn-secret-key")
         creds = resolve_api_key_provider_credentials("minimax-cn")
         assert creds["provider"] == "minimax-cn"
         assert creds["api_key"] == "mmcn-secret-key"
-        assert creds["base_url"] == "https://api.minimaxi.com/v1"
+        assert creds["base_url"] == "https://api.minimaxi.com/anthropic"
 
     def test_resolve_ai_gateway_with_key(self, monkeypatch):
         monkeypatch.setenv("AI_GATEWAY_API_KEY", "gw-secret-key")
diff --git a/tests/test_runtime_provider_resolution.py b/tests/test_runtime_provider_resolution.py
index 4789287c..6a50db79 100644
--- a/tests/test_runtime_provider_resolution.py
+++ b/tests/test_runtime_provider_resolution.py
@@ -479,8 +479,8 @@ def test_api_key_provider_explicit_api_mode_config(monkeypatch):
     assert resolved["api_mode"] == "anthropic_messages"
 
 
-def test_api_key_provider_default_url_stays_chat_completions(monkeypatch):
-    """API-key providers with default /v1 URL should stay on chat_completions."""
+def test_minimax_default_url_uses_anthropic_messages(monkeypatch):
+    """MiniMax with default /anthropic URL should auto-detect anthropic_messages mode."""
     monkeypatch.setattr(rp, "resolve_provider", lambda *a, **k: "minimax")
     monkeypatch.setattr(rp, "_get_model_config", lambda: {})
     monkeypatch.setenv("MINIMAX_API_KEY", "test-minimax-key")
@@ -488,9 +488,50 @@ def test_api_key_provider_default_url_stays_chat_completions(monkeypatch):
 
     resolved = rp.resolve_runtime_provider(requested="minimax")
 
+    assert resolved["provider"] == "minimax"
+    assert resolved["api_mode"] == "anthropic_messages"
+    assert resolved["base_url"] == "https://api.minimax.io/anthropic"
+
+
+def test_minimax_stale_v1_url_auto_corrected(monkeypatch):
+    """MiniMax with stale /v1 base URL should be auto-corrected to /anthropic."""
+    monkeypatch.setattr(rp, "resolve_provider", lambda *a, **k: "minimax")
+    monkeypatch.setattr(rp, "_get_model_config", lambda: {})
+    monkeypatch.setenv("MINIMAX_API_KEY", "test-minimax-key")
+    monkeypatch.setenv("MINIMAX_BASE_URL", "https://api.minimax.io/v1")
+
+    resolved = rp.resolve_runtime_provider(requested="minimax")
+
+    assert resolved["provider"] == "minimax"
+    assert resolved["api_mode"] == "anthropic_messages"
+    assert resolved["base_url"] == "https://api.minimax.io/anthropic"
+
+
+def test_minimax_cn_stale_v1_url_auto_corrected(monkeypatch):
+    """MiniMax-CN with stale /v1 base URL should be auto-corrected to /anthropic."""
+    monkeypatch.setattr(rp, "resolve_provider", lambda *a, **k: "minimax-cn")
+    monkeypatch.setattr(rp, "_get_model_config", lambda: {})
+    monkeypatch.setenv("MINIMAX_CN_API_KEY", "test-minimax-cn-key")
+    monkeypatch.setenv("MINIMAX_CN_BASE_URL", "https://api.minimaxi.com/v1")
+
+    resolved = rp.resolve_runtime_provider(requested="minimax-cn")
+
+    assert resolved["provider"] == "minimax-cn"
+    assert resolved["api_mode"] == "anthropic_messages"
+    assert resolved["base_url"] == "https://api.minimaxi.com/anthropic"
+
+
+def test_minimax_explicit_api_mode_respected(monkeypatch):
+    """Explicit api_mode config should override MiniMax auto-detection."""
+    monkeypatch.setattr(rp, "resolve_provider", lambda *a, **k: "minimax")
+    monkeypatch.setattr(rp, "_get_model_config", lambda: {"api_mode": "chat_completions"})
+    monkeypatch.setenv("MINIMAX_API_KEY", "test-minimax-key")
+    monkeypatch.delenv("MINIMAX_BASE_URL", raising=False)
+
+    resolved = rp.resolve_runtime_provider(requested="minimax")
+
     assert resolved["provider"] == "minimax"
     assert resolved["api_mode"] == "chat_completions"
-    assert resolved["base_url"] == "https://api.minimax.io/v1"
 
 
 def test_named_custom_provider_anthropic_api_mode(monkeypatch):