Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -2473,7 +2473,12 @@
   nextToken();
   if (FormatTok->is(tok::exclaim))
     nextToken();
+
+  bool KeepIfBraces = false;
+  bool KeepElseBraces = false;
   if (FormatTok->is(tok::kw_consteval)) {
+    KeepIfBraces = true;
+    KeepElseBraces = true;
     nextToken();
   } else {
     if (FormatTok->isOneOf(tok::kw_constexpr, tok::identifier))
@@ -2501,10 +2506,10 @@
     parseUnbracedBody();
   }
 
-  bool KeepIfBraces = false;
   if (Style.RemoveBracesLLVM) {
     assert(!NestedTooDeep.empty());
-    KeepIfBraces = (IfLeftBrace && !IfLeftBrace->MatchingParen) ||
+    KeepIfBraces = KeepIfBraces ||
+                   (IfLeftBrace && !IfLeftBrace->MatchingParen) ||
                    NestedTooDeep.back() || IfBlockKind == IfStmtKind::IfOnly ||
                    IfBlockKind == IfStmtKind::IfElseIf;
   }
@@ -2558,8 +2563,9 @@
     return nullptr;
 
   assert(!NestedTooDeep.empty());
-  const bool KeepElseBraces =
-      (ElseLeftBrace && !ElseLeftBrace->MatchingParen) || NestedTooDeep.back();
+  KeepElseBraces = KeepElseBraces ||
+                   (ElseLeftBrace && !ElseLeftBrace->MatchingParen) ||
+                   NestedTooDeep.back();
 
   NestedTooDeep.pop_back();
 
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -25379,6 +25379,25 @@
                "}",
                Style);
 
+  verifyFormat("if consteval {\n"
+               "  f();\n"
+               "} else {\n"
+               "  g();\n"
+               "}",
+               Style);
+
+  verifyFormat("if not consteval {\n"
+               "  f();\n"
+               "} else if (a) {\n"
+               "  g();\n"
+               "}",
+               Style);
+
+  verifyFormat("if !consteval {\n"
+               "  g();\n"
+               "}",
+               Style);
+
   Style.ColumnLimit = 65;
 
   verifyFormat("if (condition) {\n"