diff --git a/app/main.py b/app/main.py
index 02a7026..f85caeb 100644
--- a/app/main.py
+++ b/app/main.py
@@ -654,10 +654,11 @@ def api_check(model_id: str):
             # упадёт, реально потраченные токены сохраняются в checks.
             usage = extract_usage(resp)
             choice = resp["choices"][0]
-            content = choice["message"].get("content")
-            ok = isinstance(content, str) and bool(content.strip())
+            message = choice["message"]
+            ok = any(isinstance(message.get(field), str) and message[field].strip()
+                     for field in ("content", "reasoning_content"))
             if not ok:
-                error = f"Empty text response (finish_reason={choice.get('finish_reason')})"
+                error = f"Empty content and reasoning (finish_reason={choice.get('finish_reason')})"
     except Exception as e:
         error = f"{type(e).__name__}: {e}"
         print(f"[check] {model_id}: {error}")
diff --git a/app/probe.py b/app/probe.py
index b322be8..dac03c3 100644
--- a/app/probe.py
+++ b/app/probe.py
@@ -51,13 +51,16 @@ def check_model(model_id: str) -> tuple[bool, int | None, str | None, dict]:
             resp = json.loads(r.read())
             # Usage — до любой валидации контента.
             usage = extract_usage(resp)
-            # HTTP 200 может содержать только reasoning и content=null.
-            # Это не успешный текстовый ответ и не ошибка Python.
+            # HTTP 200 может содержать только reasoning при исчерпании лимита.
+            # Наличие текста в любом из двух полей достаточно для liveness.
             choice = resp["choices"][0]
-            content = choice["message"].get("content")
-            ok = isinstance(content, str) and bool(content.strip())
+            message = choice["message"]
+            # Liveness: непустой текст в content ИЛИ reasoning_content.
+            # Usage само по себе не доказывает, что модель выдала ответ.
+            ok = any(isinstance(message.get(field), str) and message[field].strip()
+                     for field in ("content", "reasoning_content"))
             if not ok:
-                error = f"Empty text response (finish_reason={choice.get('finish_reason')})"
+                error = f"Empty content and reasoning (finish_reason={choice.get('finish_reason')})"
     except Exception as e:
         error = f"{type(e).__name__}: {e}"
         print(f"  ✗ {model_id}: {error}", file=sys.stderr)
diff --git a/tests/test_reasoning_probe.py b/tests/test_reasoning_probe.py
index c024950..bd913f9 100644
--- a/tests/test_reasoning_probe.py
+++ b/tests/test_reasoning_probe.py
@@ -1,34 +1,47 @@
-"""Оба пути пробы запрашивают none и не падают на reasoning-only ответе."""
-import json
+"""Оба пути пробы принимают текст в content или reasoning_content."""
 import sqlite3
 
 
-def test_cron_disables_reasoning_and_reports_null_content(core, omni_server):
-    omni_server.set_completions(content=None, reasoning_content="thinking", finish_reason="length",
+def test_cron_accepts_reasoning_only(core, omni_server):
+    omni_server.set_completions(content=None, reasoning_content=" thinking ", finish_reason="length",
                                 usage={"prompt_tokens": 12, "completion_tokens": 5, "total_tokens": 17})
     ok, latency, error, usage = core.probe.check_model("zai/test-model-a")
-    assert ok is False
-    assert error == "Empty text response (finish_reason=length)"
+    assert ok is True and error is None
     assert usage["total_tokens"] == 17
     request = omni_server.requests[-1]["body"]
     assert request["reasoning_effort"] == "none"
     assert request["max_tokens"] == 5
 
 
-def test_manual_disables_reasoning_and_persists_empty_text(core, omni_server):
+def test_manual_accepts_reasoning_only_and_persists_usage(core, omni_server):
     omni_server.set_completions(content=None, reasoning_content="thinking", finish_reason="length",
                                 usage={"prompt_tokens": 12, "completion_tokens": 5, "total_tokens": 17})
     response = core.client.get("/api/check/zai/test-model-a")
     assert response.status_code == 200
-    assert response.json()["ok"] is False
+    assert response.json()["ok"] is True
     assert omni_server.requests[-1]["body"]["reasoning_effort"] == "none"
     db = sqlite3.connect(core.db_path)
     row = db.execute("SELECT ok,error,total_tokens FROM checks ORDER BY id DESC LIMIT 1").fetchone()
     db.close()
-    assert row == (0, "Empty text response (finish_reason=length)", 17)
+    assert row == (1, None, 17)
+
+
+def test_both_fields_empty_are_not_success(core, omni_server):
+    omni_server.set_completions(content="  ", reasoning_content="\t", finish_reason="length",
+                                usage={"prompt_tokens": 12, "completion_tokens": 5, "total_tokens": 17})
+    ok, _, error, usage = core.probe.check_model("zai/test-model-a")
+    assert ok is False
+    assert error == "Empty content and reasoning (finish_reason=length)"
+    assert usage["total_tokens"] == 17
+    response = core.client.get("/api/check/zai/test-model-a")
+    assert response.json()["ok"] is False
+    db = sqlite3.connect(core.db_path)
+    row = db.execute("SELECT ok,error,total_tokens FROM checks ORDER BY id DESC LIMIT 1").fetchone()
+    db.close()
+    assert row == (0, "Empty content and reasoning (finish_reason=length)", 17)
 
 
 def test_text_response_still_succeeds(core, omni_server):
-    omni_server.set_completions(content=" 4 ")
+    omni_server.set_completions(content=" 4 ", reasoning_content=None)
     assert core.probe.check_model("zai/test-model-a")[0] is True
     assert core.client.get("/api/check/zai/test-model-a").json()["ok"] is True