diff --git a/tests/integration/test_openapi_json.py b/tests/integration/test_openapi_json.py
new file mode 100644
index 00000000..6986f01f
--- /dev/null
+++ b/tests/integration/test_openapi_json.py
@@ -0,0 +1,91 @@
+"""Tests the OpenAPI specification that is to be stored in docs/openapi.json."""
+
+import json
+from pathlib import Path
+
+import pytest
+
+# Strategy:
+# - Load the OpenAPI document from docs/openapi.json
+# - Validate critical structure based on the PR diff:
+#   * openapi version, info, servers
+#   * presence of paths/methods and key response codes
+#   * presence and key attributes of important component schemas (enums, required fields)
+
+OPENAPI_FILE = "docs/openapi.json"
+
+
+def _load_openapi_spec() -> dict:
+    """Load OpenAPI specification from configured path."""
+    path = Path(OPENAPI_FILE)
+    if path.is_file():
+        with path.open("r", encoding="utf-8") as f:
+            return json.load(f)
+
+    pytest.fail("OpenAPI spec not found")
+    return {}
+
+
+@pytest.fixture(scope="module", name="spec")
+def open_api_spec() -> dict:
+    """Fixture containing OpenAPI specification represented as a dictionary."""
+    return _load_openapi_spec()
+
+
+def test_openapi_top_level_info(spec: dict):
+    """Test all top level informations stored in OpenAPI specification."""
+    assert spec.get("openapi") == "3.1.0"
+
+    info = spec.get("info") or {}
+    assert info.get("title") == "Lightspeed Core Service (LCS) service - OpenAPI"
+    assert "version" in info
+
+    contact = info.get("contact") or {}
+    assert contact is not None
+
+    license_info = info.get("license") or {}
+    assert license_info.get("name") == "Apache 2.0"
+    assert "apache.org/licenses" in (license_info.get("url") or "")
+
+
+def test_servers_section_present(spec: dict):
+    """Test the servers section stored in OpenAPI specification."""
+    servers = spec.get("servers")
+    assert isinstance(servers, list) and servers, "servers must be a non-empty list"
+
+
+@pytest.mark.parametrize(
+    "path,method,expected_codes",
+    [
+        ("/", "get", {"200"}),
+        ("/v1/info", "get", {"200", "500"}),
+        ("/v1/models", "get", {"200", "503"}),
+        ("/v1/query", "post", {"200", "400", "403", "503", "422"}),
+        ("/v1/streaming_query", "post", {"200", "422"}),
+        ("/v1/config", "get", {"200", "503"}),
+        ("/v1/feedback", "post", {"200", "401", "403", "500", "422"}),
+        ("/v1/feedback/status", "get", {"200"}),
+        ("/v1/feedback/status", "put", {"200", "422"}),
+        ("/v1/conversations", "get", {"200", "503"}),
+        ("/v1/conversations/{conversation_id}", "get", {"200", "404", "503", "422"}),
+        ("/v1/conversations/{conversation_id}", "delete", {"200", "404", "503", "422"}),
+        ("/readiness", "get", {"200", "503"}),
+        ("/liveness", "get", {"200", "503"}),
+        ("/authorized", "post", {"200", "400", "403"}),
+        ("/metrics", "get", {"200"}),
+    ],
+)
+def test_paths_and_responses_exist(
+    spec: dict, path: str, method: str, expected_codes: set[str]
+):
+    """Tests all paths defined in OpenAPI specification."""
+    paths = spec.get("paths") or {}
+    assert path in paths, f"Missing path: {path}"
+    op = (paths[path] or {}).get(method)
+    assert isinstance(op, dict), f"Missing method {method.upper()} for path {path}"
+    responses = op.get("responses") or {}
+    got_codes = set(responses.keys())
+    for code in expected_codes:
+        assert (
+            code in got_codes
+        ), f"Missing response code {code} for {method.upper()} {path}"