diff --git a/mypy/fastparse.py b/mypy/fastparse.py
index aed04c6f2eb9..6c59f44829bb 100644
--- a/mypy/fastparse.py
+++ b/mypy/fastparse.py
@@ -270,7 +270,9 @@ def parse(
         errors.report(
             e.lineno if e.lineno is not None else -1,
             e.offset,
-            message,
+            re.sub(
+                r"^(\s*\w)", lambda m: m.group(1).upper(), message
+            ),  # Standardizing error message
             blocker=True,
             code=codes.SYNTAX,
         )
diff --git a/mypy/test/teststubtest.py b/mypy/test/teststubtest.py
index 492897d33a4a..7925f2a6bd3e 100644
--- a/mypy/test/teststubtest.py
+++ b/mypy/test/teststubtest.py
@@ -2581,7 +2581,7 @@ def test_mypy_build(self) -> None:
         output = run_stubtest(stub="+", runtime="", options=[])
         assert output == (
             "error: not checking stubs due to failed mypy compile:\n{}.pyi:1: "
-            "error: invalid syntax  [syntax]\n".format(TEST_MODULE_NAME)
+            "error: Invalid syntax  [syntax]\n".format(TEST_MODULE_NAME)
         )
 
         output = run_stubtest(stub="def f(): ...\ndef f(): ...", runtime="", options=[])
diff --git a/test-data/unit/check-basic.test b/test-data/unit/check-basic.test
index 6ecbbdcc13eb..3f2164bf5a24 100644
--- a/test-data/unit/check-basic.test
+++ b/test-data/unit/check-basic.test
@@ -289,7 +289,7 @@ x in 1,  # E: Unsupported right operand type for in ("int")
 [case testTrailingCommaInIfParsing]
 if x in 1, : pass
 [out]
-main:1: error: invalid syntax
+main:1: error: Invalid syntax
 
 [case testInitReturnTypeError]
 class C:
diff --git a/test-data/unit/check-columns.test b/test-data/unit/check-columns.test
index 8f91d99a0576..c18313bbc24f 100644
--- a/test-data/unit/check-columns.test
+++ b/test-data/unit/check-columns.test
@@ -4,7 +4,7 @@
 f()
 1 +
 [out]
-main:2:5: error: invalid syntax
+main:2:5: error: Invalid syntax
 
 [case testColumnsNestedFunctions]
 import typing
diff --git a/test-data/unit/check-errorcodes.test b/test-data/unit/check-errorcodes.test
index 21112b7d85a2..0cd6dc081629 100644
--- a/test-data/unit/check-errorcodes.test
+++ b/test-data/unit/check-errorcodes.test
@@ -33,9 +33,9 @@ reveal_type(1) # N: Revealed type is "Literal[1]?"
 [case testErrorCodeSyntaxError]
 1 ''
 [out]
-main:1: error: invalid syntax  [syntax]
+main:1: error: Invalid syntax  [syntax]
 [out version==3.10.0]
-main:1: error: invalid syntax. Perhaps you forgot a comma?  [syntax]
+main:1: error: Invalid syntax. Perhaps you forgot a comma?  [syntax]
 
 [case testErrorCodeSyntaxError2]
 def f(): # E: Type signature has too many arguments  [syntax]
diff --git a/test-data/unit/check-expressions.test b/test-data/unit/check-expressions.test
index 81eb4c7c0dc8..a3b15a3b1da4 100644
--- a/test-data/unit/check-expressions.test
+++ b/test-data/unit/check-expressions.test
@@ -1861,7 +1861,7 @@ None < None  # E: Unsupported left operand type for < ("None")
 
 [case testDictWithStarExpr]
 
-b = {'z': 26, *a}  # E: invalid syntax
+b = {'z': 26, *a}  # E: Invalid syntax
 [builtins fixtures/dict.pyi]
 
 [case testDictWithStarStarExpr]
diff --git a/test-data/unit/check-fastparse.test b/test-data/unit/check-fastparse.test
index f93e4fe07218..80d314333ddc 100644
--- a/test-data/unit/check-fastparse.test
+++ b/test-data/unit/check-fastparse.test
@@ -1,6 +1,6 @@
 [case testFastParseSyntaxError]
 
-1 +  # E: invalid syntax
+1 +  # E: Invalid syntax
 
 [case testFastParseTypeCommentSyntaxError]
 
@@ -158,7 +158,7 @@ def f(a,        # type: A
 
 [case testFastParsePerArgumentAnnotationsWithAnnotatedBareStar]
 
-def f(*, # type: int  # E: bare * has associated type comment
+def f(*, # type: int  # E: Bare * has associated type comment
       x  # type: str
       ):
       # type: (...) -> int
diff --git a/test-data/unit/check-ignore.test b/test-data/unit/check-ignore.test
index fa451f373e70..a4234e7a37a1 100644
--- a/test-data/unit/check-ignore.test
+++ b/test-data/unit/check-ignore.test
@@ -38,7 +38,7 @@ from m import a # type: ignore
 [file m.py]
 +
 [out]
-tmp/m.py:1: error: invalid syntax
+tmp/m.py:1: error: Invalid syntax
 
 [case testIgnoreAppliesOnlyToMissing]
 import a # type: ignore
@@ -59,7 +59,7 @@ from m import * # type: ignore
 [file m.py]
 +
 [out]
-tmp/m.py:1: error: invalid syntax
+tmp/m.py:1: error: Invalid syntax
 
 [case testIgnoreAssignmentTypeError]
 x = 1
diff --git a/test-data/unit/check-newsyntax.test b/test-data/unit/check-newsyntax.test
index 3ed4c6d3d8e2..a696eb2932fe 100644
--- a/test-data/unit/check-newsyntax.test
+++ b/test-data/unit/check-newsyntax.test
@@ -1,5 +1,5 @@
 [case testNewSyntaxSyntaxError]
-x: int: int  # E: invalid syntax
+x: int: int  # E: Invalid syntax
 [out]
 
 [case testNewSyntaxBasics]
@@ -126,4 +126,4 @@ reveal_type(f'{1}') # N: Revealed type is "builtins.str"
 # flags: --python-version 3.99
 x *** x this is what future python looks like public static void main String[] args await goto exit
 [out]
-main:2: error: invalid syntax; you likely need to run mypy using Python 3.99 or newer
+main:2: error: Invalid syntax; you likely need to run mypy using Python 3.99 or newer
diff --git a/test-data/unit/check-statements.test b/test-data/unit/check-statements.test
index 9f77100863be..b0b673f696e1 100644
--- a/test-data/unit/check-statements.test
+++ b/test-data/unit/check-statements.test
@@ -1311,7 +1311,7 @@ def f() -> Iterator[List[int]]:
 
 [case testYieldFromNotAppliedToNothing]
 def h():
-    yield from  # E: invalid syntax
+    yield from  # E: Invalid syntax
 [out]
 
 [case testYieldFromAndYieldTogether]
diff --git a/test-data/unit/cmdline.test b/test-data/unit/cmdline.test
index 748a655d5a10..fb2e0c01fe0e 100644
--- a/test-data/unit/cmdline.test
+++ b/test-data/unit/cmdline.test
@@ -896,7 +896,7 @@ some_file.py:11: error: Argument 1 to "some_interesting_method" of
 [file some_file.py]
 it_looks_like_we_started_typing_something_but_then. = did_not_notice(an_extra_dot)
 [out]
-some_file.py:1: error: invalid syntax  [syntax]
+some_file.py:1: error: Invalid syntax  [syntax]
     ...ooks_like_we_started_typing_something_but_then. = did_not_notice(an_ex...
                                                         ^
 == Return code: 2
@@ -1035,15 +1035,15 @@ public static void main(String[] args)
 [file pkg/y.py]
 x: str = 0
 [out]
-pkg/x.py:1: error: invalid syntax
+pkg/x.py:1: error: Invalid syntax
 Found 1 error in 1 file (errors prevented further checking)
 == Return code: 2
 [out version>=3.10]
-pkg/x.py:1: error: invalid syntax. Perhaps you forgot a comma?
+pkg/x.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 Found 1 error in 1 file (errors prevented further checking)
 == Return code: 2
 [out version>=3.10.3]
-pkg/x.py:1: error: invalid syntax
+pkg/x.py:1: error: Invalid syntax
 Found 1 error in 1 file (errors prevented further checking)
 == Return code: 2
 
diff --git a/test-data/unit/fine-grained-blockers.test b/test-data/unit/fine-grained-blockers.test
index 33dedd887114..8e16da053d6a 100644
--- a/test-data/unit/fine-grained-blockers.test
+++ b/test-data/unit/fine-grained-blockers.test
@@ -19,13 +19,13 @@ def f(x: int) -> None: pass
 def f() -> None: pass
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 main:2: error: Missing positional argument "x" in call to "f"
 ==
 [out version>=3.10]
 ==
-a.py:1: error: expected ':'
+a.py:1: error: Expected ':'
 ==
 main:2: error: Missing positional argument "x" in call to "f"
 ==
@@ -44,7 +44,7 @@ def f(x: int) -> None: pass
 def f() -> None: pass
 [out]
 ==
-a.py:1: error: invalid syntax  [syntax]
+a.py:1: error: Invalid syntax  [syntax]
     def f(x: int) ->
                     ^
 ==
@@ -54,7 +54,7 @@ main:3: error: Missing positional argument "x" in call to "f"  [call-arg]
 ==
 [out version>=3.10]
 ==
-a.py:1: error: expected ':'  [syntax]
+a.py:1: error: Expected ':'  [syntax]
     def f(x: int) ->
                    ^
 ==
@@ -77,16 +77,16 @@ def f(x: int
 def f(x: int) -> None: pass
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
-a.py:2: error: invalid syntax
+a.py:2: error: Invalid syntax
 ==
 main:2: error: Missing positional argument "x" in call to "f"
 [out version>=3.10]
 ==
-a.py:1: error: expected ':'
+a.py:1: error: Expected ':'
 ==
-a.py:2: error: expected ':'
+a.py:2: error: Expected ':'
 ==
 main:2: error: Missing positional argument "x" in call to "f"
 
@@ -124,7 +124,7 @@ def f() -> None: pass
 main:3: error: Too many arguments for "f"
 main:5: error: Too many arguments for "f"
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 main:3: error: Too many arguments for "f"
 main:5: error: Too many arguments for "f"
@@ -132,7 +132,7 @@ main:5: error: Too many arguments for "f"
 main:3: error: Too many arguments for "f"
 main:5: error: Too many arguments for "f"
 ==
-a.py:1: error: expected ':'
+a.py:1: error: Expected ':'
 ==
 main:3: error: Too many arguments for "f"
 main:5: error: Too many arguments for "f"
@@ -153,12 +153,12 @@ class C:
     def f(self, x: int) -> None: pass
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 main:5: error: Missing positional argument "x" in call to "f" of "C"
 [out version==3.10.0]
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 main:5: error: Missing positional argument "x" in call to "f" of "C"
 
@@ -173,14 +173,14 @@ def f() -> None: pass
 main:1: error: Cannot find implementation or library stub for module named "a"
 main:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 main:2: error: Too many arguments for "f"
 [out version==3.10.0]
 main:1: error: Cannot find implementation or library stub for module named "a"
 main:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 main:2: error: Too many arguments for "f"
 
@@ -208,7 +208,7 @@ a.f()
 def g() -> None: pass
 [out]
 ==
-b.py:1: error: invalid syntax
+b.py:1: error: Invalid syntax
 ==
 
 [case testModifyTwoFilesOneWithBlockingError2]
@@ -235,7 +235,7 @@ def f() -> None: pass
 b.g()
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 
 [case testBlockingErrorRemainsUnfixed]
@@ -254,16 +254,16 @@ import b
 b.f()
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 a.py:2: error: Missing positional argument "x" in call to "f"
 [out version==3.10.0]
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 a.py:2: error: Missing positional argument "x" in call to "f"
 
@@ -303,9 +303,9 @@ def g() -> None: pass
 a.f(1)
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 a.py:3: error: Too many arguments for "g"
 b.py:3: error: Too many arguments for "f"
@@ -325,14 +325,14 @@ x x
 [delete a.py.3]
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 main:1: error: Cannot find implementation or library stub for module named "a"
 main:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 b.py:1: error: Cannot find implementation or library stub for module named "a"
 [out version==3.10.0]
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 main:1: error: Cannot find implementation or library stub for module named "a"
 main:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
@@ -353,14 +353,14 @@ x x
 [delete a.py.3]
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 b.py:1: error: Cannot find implementation or library stub for module named "a"
 b.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 main:1: error: Cannot find implementation or library stub for module named "a"
 [out version==3.10.0]
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 b.py:1: error: Cannot find implementation or library stub for module named "a"
 b.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
@@ -382,17 +382,17 @@ a.f()
 [builtins fixtures/module.pyi]
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 b.py:2: error: Module has no attribute "f"
 b.py:3: error: "int" not callable
 [out version==3.10.0]
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 b.py:2: error: Module has no attribute "f"
 b.py:3: error: "int" not callable
@@ -408,12 +408,12 @@ import blocker
 def f() -> None: pass
 [out]
 ==
-<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: invalid syntax
+<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: Invalid syntax
 ==
 a.py:1: error: "int" not callable
 [out version==3.10.0]
 ==
-<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: invalid syntax. Perhaps you forgot a comma?
+<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 a.py:1: error: "int" not callable
 
@@ -485,16 +485,16 @@ import sys
 [builtins fixtures/tuple.pyi]
 [out]
 ==
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
-<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: invalid syntax
+<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: Invalid syntax
 ==
 a.py:2: error: "int" not callable
 [out version==3.10.0]
 ==
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
-<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: invalid syntax. Perhaps you forgot a comma?
+<ROOT>/test-data/unit/lib-stub/blocker.pyi:2: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 a.py:2: error: "int" not callable
 
@@ -511,12 +511,12 @@ x = 1
 def f() -> int:
     return 0
 [out]
-a.py:1: error: invalid syntax
+a.py:1: error: Invalid syntax
 ==
 b.py:2: error: Incompatible return value type (got "str", expected "int")
 ==
 [out version==3.10.0]
-a.py:1: error: invalid syntax. Perhaps you forgot a comma?
+a.py:1: error: Invalid syntax. Perhaps you forgot a comma?
 ==
 b.py:2: error: Incompatible return value type (got "str", expected "int")
 ==
diff --git a/test-data/unit/fine-grained-suggest.test b/test-data/unit/fine-grained-suggest.test
index 2539886229cf..ba6006300a4c 100644
--- a/test-data/unit/fine-grained-suggest.test
+++ b/test-data/unit/fine-grained-suggest.test
@@ -1035,10 +1035,10 @@ def foo():
 
 (
 [out]
-foo.py:4: error: unexpected EOF while parsing
+foo.py:4: error: Unexpected EOF while parsing
 Command 'suggest' is only valid after a 'check' command (that produces no parse errors)
 ==
-foo.py:4: error: unexpected EOF while parsing
+foo.py:4: error: Unexpected EOF while parsing
 [out version>=3.10]
 foo.py:4: error: '(' was never closed
 Command 'suggest' is only valid after a 'check' command (that produces no parse errors)
diff --git a/test-data/unit/parse-errors.test b/test-data/unit/parse-errors.test
index 33c2a6ddf5c0..a192cc02d0cc 100644
--- a/test-data/unit/parse-errors.test
+++ b/test-data/unit/parse-errors.test
@@ -12,102 +12,102 @@
 def f()
   pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testUnexpectedIndent]
 1
  2
 [out]
-file:2: error: unexpected indent
+file:2: error: Unexpected indent
 
 [case testInconsistentIndent]
 if x:
   1
    1
 [out]
-file:3: error: unexpected indent
+file:3: error: Unexpected indent
 
 [case testInconsistentIndent2]
 if x:
    1
   1
 [out]
-file:3: error: unindent does not match any outer indentation level
+file:3: error: Unindent does not match any outer indentation level
 
 [case testInvalidBinaryOp]
 1>
 a*
 a+1*
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testDoubleStar]
 **a
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testMissingSuperClass]
 class A(:
   pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testUnexpectedEof]
 if 1:
 [out]
-file:1: error: expected an indented block
+file:1: error: Expected an indented block
 
 [case testInvalidKeywordArguments1]
 f(x=y, z)
 [out]
-file:1: error: positional argument follows keyword argument
+file:1: error: Positional argument follows keyword argument
 
 [case testInvalidKeywordArguments2]
 f(**x, y)
 [out]
-file:1: error: positional argument follows keyword argument unpacking
+file:1: error: Positional argument follows keyword argument unpacking
 
 [case testInvalidBareAsteriskAndVarArgs2]
 def f(*x: A, *) -> None: pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidBareAsteriskAndVarArgs3]
 def f(*, *x: A) -> None: pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidBareAsteriskAndVarArgs4]
 def f(*, **x: A) -> None: pass
 [out]
-file:1: error: named arguments must follow bare *
+file:1: error: Named arguments must follow bare *
 
 [case testInvalidBareAsterisk1]
 def f(*) -> None: pass
 [out]
-file:1: error: named arguments must follow bare *
+file:1: error: Named arguments must follow bare *
 
 [case testInvalidBareAsterisk2]
 def f(x, *) -> None: pass
 [out]
-file:1: error: named arguments must follow bare *
+file:1: error: Named arguments must follow bare *
 
 [case testInvalidFuncDefArgs1]
 def f(x = y, x): pass
 [out]
-file:1: error: non-default argument follows default argument
+file:1: error: Non-default argument follows default argument
 
 [case testInvalidFuncDefArgs3]
 def f(**x, y):
    pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidFuncDefArgs4]
 def f(**x, y=x):
     pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidTypeComment]
 0
@@ -154,7 +154,7 @@ file:2: error: Syntax error in type comment "A B"
 [case testMissingBracket]
 def foo(
 [out]
-file:1: error: unexpected EOF while parsing
+file:1: error: Unexpected EOF while parsing
 [out version>=3.10]
 file:1: error: '(' was never closed
 
@@ -288,153 +288,153 @@ file:1: error: Missing parentheses in call to 'print'. Did you mean print(1)?
 [case testInvalidConditionInConditionalExpression]
 1 if 2, 3 else 4
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidConditionInConditionalExpression2]
 1 if x for y in z else 4
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidConditionInConditionalExpression3]
 1 if x else for y in z
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testYieldFromNotRightParameter]
 def f():
     yield from
 [out]
-file:2: error: invalid syntax
+file:2: error: Invalid syntax
 
 [case testYieldFromAfterReturn]
 def f():
     return yield from h()
 [out]
-file:2: error: invalid syntax
+file:2: error: Invalid syntax
 
 [case testImportDotModule]
 import .x
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testImportDot]
 import .
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidFunctionName]
 def while(): pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testInvalidEllipsis1]
 ...0
 ..._
 ...a
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testBlockStatementInSingleLineIf]
 if 1: if 2: pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testBlockStatementInSingleLineIf2]
 if 1: while 2: pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testBlockStatementInSingleLineIf3]
 if 1: for x in y: pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testUnexpectedEllipsis]
 a = a...
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testParseErrorBeforeUnicodeLiteral]
 x u'y'
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testParseErrorInExtendedSlicing]
 x[:,
 [out]
-file:1: error: unexpected EOF while parsing
+file:1: error: Unexpected EOF while parsing
 
 [case testParseErrorInExtendedSlicing2]
 x[:,::
 [out]
-file:1: error: unexpected EOF while parsing
+file:1: error: Unexpected EOF while parsing
 
 [case testParseErrorInExtendedSlicing3]
 x[:,:
 [out]
-file:1: error: unexpected EOF while parsing
+file:1: error: Unexpected EOF while parsing
 
 [case testInvalidEncoding]
 # foo
 # coding: uft-8
 [out]
-file:0: error: unknown encoding: uft-8
+file:0: error: Unknown encoding: uft-8
 
 [case testInvalidEncoding2]
 # coding=Uft.8
 [out]
-file:0: error: unknown encoding: Uft.8
+file:0: error: Unknown encoding: Uft.8
 
 [case testInvalidEncoding3]
 #!/usr/bin python
 # vim: set fileencoding=uft8 :
 [out]
-file:0: error: unknown encoding: uft8
+file:0: error: Unknown encoding: uft8
 
 [case testDoubleEncoding]
 # coding: uft8
 # coding: utf8
 # The first coding cookie should be used and fail.
 [out]
-file:0: error: unknown encoding: uft8
+file:0: error: Unknown encoding: uft8
 
 [case testDoubleEncoding2]
 # Again the first cookie should be used and fail.
 # coding: uft8
 # coding: utf8
 [out]
-file:0: error: unknown encoding: uft8
+file:0: error: Unknown encoding: uft8
 
 [case testLongLiteralInPython3]
 2L
 0x2L
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testPython2LegacyInequalityInPython3]
 1 <> 2
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testLambdaInListComprehensionInPython3]
 ([ 0 for x in 1, 2 if 3 ])
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testTupleArgListInPython3]
 def f(x, (y, z)): pass
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testBackquoteInPython3]
 `1 + 2`
 [out]
-file:1: error: invalid syntax
+file:1: error: Invalid syntax
 
 [case testSmartQuotes]
 foo = ‘bar’
 [out]
-file:1: error: invalid character '‘' (U+2018)
+file:1: error: Invalid character '‘' (U+2018)
 
 [case testExceptCommaInPython3]
 try:
@@ -442,4 +442,4 @@ try:
 except KeyError, IndexError:
     pass
 [out]
-file:3: error: invalid syntax
+file:3: error: Invalid syntax
diff --git a/test-data/unit/parse.test b/test-data/unit/parse.test
index 943ca49081f1..fa1d797fada4 100644
--- a/test-data/unit/parse.test
+++ b/test-data/unit/parse.test
@@ -932,20 +932,20 @@ MypyFile:1(
 [case testNotAsBinaryOp]
 x not y
 [out]
-main:1: error: invalid syntax
+main:1: error: Invalid syntax
 [out version==3.10.0]
-main:1: error: invalid syntax. Perhaps you forgot a comma?
+main:1: error: Invalid syntax. Perhaps you forgot a comma?
 
 [case testNotIs]
-x not is y # E: invalid syntax
+x not is y # E: Invalid syntax
 [out]
 
 [case testBinaryNegAsBinaryOp]
 1 ~ 2
 [out]
-main:1: error: invalid syntax
+main:1: error: Invalid syntax
 [out version==3.10.0]
-main:1: error: invalid syntax. Perhaps you forgot a comma?
+main:1: error: Invalid syntax. Perhaps you forgot a comma?
 
 [case testSliceInList39]
 # flags: --python-version 3.9
@@ -3211,7 +3211,7 @@ MypyFile:1(
 [case testParseExtendedSlicing4]
 m[*index, :]
 [out]
-main:1: error: invalid syntax
+main:1: error: Invalid syntax
 [out version>=3.11]
 MypyFile:1(
   ExpressionStmt:1(
diff --git a/test-data/unit/semanal-errors.test b/test-data/unit/semanal-errors.test
index 52c658c97c3b..fa5cec795931 100644
--- a/test-data/unit/semanal-errors.test
+++ b/test-data/unit/semanal-errors.test
@@ -361,84 +361,84 @@ main:2: error: "yield" outside function
 [case testInvalidLvalues1]
 1 = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 [out version>=3.10]
-main:1: error: cannot assign to literal here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to literal here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalues2]
 (1) = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 [out version>=3.10]
-main:1: error: cannot assign to literal here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to literal here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalues3]
 (1, 1) = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 
 [case testInvalidLvalues4]
 [1, 1] = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 
 [case testInvalidLvalues6]
 x = y = z = 1  # ok
 x, (y, 1) = 1
 [out]
-main:2: error: cannot assign to literal
+main:2: error: Cannot assign to literal
 
 [case testInvalidLvalues7]
 x, [y, 1] = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 
 [case testInvalidLvalues8]
 x, [y, [z, 1]] = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 
 [case testInvalidLvalues9]
 x, (y) = 1 # ok
 x, (y, (z, z)) = 1 # ok
 x, (y, (z, 1)) = 1
 [out]
-main:3: error: cannot assign to literal
+main:3: error: Cannot assign to literal
 
 [case testInvalidLvalues10]
 x + x = 1
 [out]
-main:1: error: cannot assign to operator
+main:1: error: Cannot assign to operator
 [out version>=3.10]
-main:1: error: cannot assign to expression here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to expression here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalues11]
 -x = 1
 [out]
-main:1: error: cannot assign to operator
+main:1: error: Cannot assign to operator
 [out version>=3.10]
-main:1: error: cannot assign to expression here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to expression here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalues12]
 1.1 = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 [out version>=3.10]
-main:1: error: cannot assign to literal here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to literal here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalues13]
 'x' = 1
 [out]
-main:1: error: cannot assign to literal
+main:1: error: Cannot assign to literal
 [out version>=3.10]
-main:1: error: cannot assign to literal here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to literal here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalues14]
 x() = 1
 [out]
-main:1: error: cannot assign to function call
+main:1: error: Cannot assign to function call
 [out version>=3.10]
-main:1: error: cannot assign to function call here. Maybe you meant '==' instead of '='?
+main:1: error: Cannot assign to function call here. Maybe you meant '==' instead of '='?
 
 [case testTwoStarExpressions]
 a, *b, *c = 1
@@ -492,15 +492,15 @@ main:2: error: can't use starred expression here
 x = 1
 del x(1)
 [out]
-main:2: error: cannot delete function call
+main:2: error: Cannot delete function call
 
 [case testInvalidDel2]
 x = 1
 del x + 1
 [out]
-main:2: error: cannot delete operator
+main:2: error: Cannot delete operator
 [out version>=3.10]
-main:2: error: cannot delete expression
+main:2: error: Cannot delete expression
 
 [case testInvalidDel3]
 del z     # E: Name "z" is not defined
@@ -897,9 +897,9 @@ import typing
 def f(): pass
 f() = 1 # type: int
 [out]
-main:3: error: cannot assign to function call
+main:3: error: Cannot assign to function call
 [out version>=3.10]
-main:3: error: cannot assign to function call here. Maybe you meant '==' instead of '='?
+main:3: error: Cannot assign to function call here. Maybe you meant '==' instead of '='?
 
 [case testIndexedAssignmentWithTypeDeclaration]
 import typing
@@ -975,9 +975,9 @@ x, y = 1, 2 # type: int # E: Tuple type expected for multiple variables
 a = 1
 a() = None # type: int
 [out]
-main:2: error: cannot assign to function call
+main:2: error: Cannot assign to function call
 [out version>=3.10]
-main:2: error: cannot assign to function call here. Maybe you meant '==' instead of '='?
+main:2: error: Cannot assign to function call here. Maybe you meant '==' instead of '='?
 
 [case testInvalidLvalueWithExplicitType2]
 a = 1
@@ -1299,7 +1299,7 @@ main:2: note: Did you forget to import it from "typing"? (Suggestion: "from typi
 def f(): pass
 with f() as 1: pass
 [out]
-main:2: error: cannot assign to literal
+main:2: error: Cannot assign to literal
 
 [case testInvalidTypeAnnotation]
 import typing
@@ -1313,9 +1313,9 @@ import typing
 def f() -> None:
     f() = 1  # type: int
 [out]
-main:3: error: cannot assign to function call
+main:3: error: Cannot assign to function call
 [out version>=3.10]
-main:3: error: cannot assign to function call here. Maybe you meant '==' instead of '='?
+main:3: error: Cannot assign to function call here. Maybe you meant '==' instead of '='?
 
 [case testInvalidReferenceToAttributeOfOuterClass]
 class A:
diff --git a/test-data/unit/semanal-statements.test b/test-data/unit/semanal-statements.test
index f828e2a3263f..a2e8691733ef 100644
--- a/test-data/unit/semanal-statements.test
+++ b/test-data/unit/semanal-statements.test
@@ -557,9 +557,9 @@ MypyFile:1(
 def f(x, y) -> None:
     del x, y + 1
 [out]
-main:2: error: cannot delete operator
+main:2: error: Cannot delete operator
 [out version>=3.10]
-main:2: error: cannot delete expression
+main:2: error: Cannot delete expression
 
 [case testTry]
 class c: pass