diff --git a/.github/mypy-primer-ty.toml b/.github/mypy-primer-ty.toml
index 981f7d77c8..0e8e75303e 100644
--- a/.github/mypy-primer-ty.toml
+++ b/.github/mypy-primer-ty.toml
@@ -4,3 +4,4 @@
 # Enable off-by-default rules.
 [rules]
 possibly-unresolved-reference = "warn"
+unused-ignore-comment = "warn"
diff --git a/crates/ruff_benchmark/benches/ty.rs b/crates/ruff_benchmark/benches/ty.rs
index 65731e9a91..028a3e8563 100644
--- a/crates/ruff_benchmark/benches/ty.rs
+++ b/crates/ruff_benchmark/benches/ty.rs
@@ -59,13 +59,7 @@ type KeyDiagnosticFields = (
     Severity,
 );
 
-static EXPECTED_TOMLLIB_DIAGNOSTICS: &[KeyDiagnosticFields] = &[(
-    DiagnosticId::lint("unused-ignore-comment"),
-    Some("/src/tomllib/_parser.py"),
-    Some(22299..22333),
-    "Unused blanket `type: ignore` directive",
-    Severity::Warning,
-)];
+static EXPECTED_TOMLLIB_DIAGNOSTICS: &[KeyDiagnosticFields] = &[];
 
 fn tomllib_path(file: &TestFile) -> SystemPathBuf {
     SystemPathBuf::from("src").join(file.name())
diff --git a/crates/ty/docs/rules.md b/crates/ty/docs/rules.md
index 81162cb9ec..d5eab62611 100644
--- a/crates/ty/docs/rules.md
+++ b/crates/ty/docs/rules.md
@@ -1495,36 +1495,6 @@ a = 20 / 0  # ty: ignore[division-by-zero]
 * [View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Fsuppression.rs#L40)
 </details>
 
-## `unused-ignore-comment`
-
-**Default level**: warn
-
-<details>
-<summary>detects unused <code>type: ignore</code> comments</summary>
-
-### What it does
-Checks for `type: ignore` or `ty: ignore` directives that are no longer applicable.
-
-### Why is this bad?
-A `type: ignore` directive that no longer matches any diagnostic violations is likely
-included by mistake, and should be removed to avoid confusion.
-
-### Examples
-```py
-a = 20 / 2  # ty: ignore[division-by-zero]
-```
-
-Use instead:
-
-```py
-a = 20 / 2
-```
-
-### Links
-* [Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unused-ignore-comment)
-* [View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Fsuppression.rs#L15)
-</details>
-
 ## `possibly-unresolved-reference`
 
 **Default level**: ignore
@@ -1552,3 +1522,33 @@ print(x)  # NameError: name 'x' is not defined
 * [View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Ftypes%2Fdiagnostic.rs#L836)
 </details>
 
+## `unused-ignore-comment`
+
+**Default level**: ignore
+
+<details>
+<summary>detects unused <code>type: ignore</code> comments</summary>
+
+### What it does
+Checks for `type: ignore` or `ty: ignore` directives that are no longer applicable.
+
+### Why is this bad?
+A `type: ignore` directive that no longer matches any diagnostic violations is likely
+included by mistake, and should be removed to avoid confusion.
+
+### Examples
+```py
+a = 20 / 2  # ty: ignore[division-by-zero]
+```
+
+Use instead:
+
+```py
+a = 20 / 2
+```
+
+### Links
+* [Related issues](https://github.com/astral-sh/ty/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20unused-ignore-comment)
+* [View source](https://github.com/astral-sh/ruff/blob/main/crates%2Fty_python_semantic%2Fsrc%2Fsuppression.rs#L15)
+</details>
+
diff --git a/crates/ty_python_semantic/resources/mdtest/snapshots/mro.md_-_Method_Resolution_Order_tests_-_`__bases__`_lists_with_duplicate_bases.snap b/crates/ty_python_semantic/resources/mdtest/snapshots/mro.md_-_Method_Resolution_Order_tests_-_`__bases__`_lists_with_duplicate_bases.snap
index efe5a34412..2b9a33d7f1 100644
--- a/crates/ty_python_semantic/resources/mdtest/snapshots/mro.md_-_Method_Resolution_Order_tests_-_`__bases__`_lists_with_duplicate_bases.snap
+++ b/crates/ty_python_semantic/resources/mdtest/snapshots/mro.md_-_Method_Resolution_Order_tests_-_`__bases__`_lists_with_duplicate_bases.snap
@@ -345,7 +345,7 @@ info: `lint:duplicate-base` is enabled by default
 ```
 
 ```
-warning: lint:unused-ignore-comment
+info: lint:unused-ignore-comment
   --> src/mdtest_snippet.py:72:9
    |
 70 |     A,
@@ -388,7 +388,7 @@ info: `lint:duplicate-base` is enabled by default
 ```
 
 ```
-warning: lint:unused-ignore-comment
+info: lint:unused-ignore-comment
   --> src/mdtest_snippet.py:81:13
    |
 79 | ):
diff --git a/crates/ty_python_semantic/src/suppression.rs b/crates/ty_python_semantic/src/suppression.rs
index dcccf57194..dc8713b988 100644
--- a/crates/ty_python_semantic/src/suppression.rs
+++ b/crates/ty_python_semantic/src/suppression.rs
@@ -33,7 +33,7 @@ declare_lint! {
     pub(crate) static UNUSED_IGNORE_COMMENT = {
         summary: "detects unused `type: ignore` comments",
         status: LintStatus::preview("1.0.0"),
-        default_level: Level::Warn,
+        default_level: Level::Ignore,
     }
 }
 
diff --git a/ty.schema.json b/ty.schema.json
index 96ff87a26f..1d3f6b6f44 100644
--- a/ty.schema.json
+++ b/ty.schema.json
@@ -813,7 +813,7 @@
         "unused-ignore-comment": {
           "title": "detects unused `type: ignore` comments",
           "description": "## What it does\nChecks for `type: ignore` or `ty: ignore` directives that are no longer applicable.\n\n## Why is this bad?\nA `type: ignore` directive that no longer matches any diagnostic violations is likely\nincluded by mistake, and should be removed to avoid confusion.\n\n## Examples\n```py\na = 20 / 2  # ty: ignore[division-by-zero]\n```\n\nUse instead:\n\n```py\na = 20 / 2\n```",
-          "default": "warn",
+          "default": "ignore",
           "oneOf": [
             {
               "$ref": "#/definitions/Level"