diff --git a/action.yml b/action.yml
index 7777d56..c8dd56b 100644
--- a/action.yml
+++ b/action.yml
@@ -89,6 +89,14 @@ inputs:
     description: Customize badge title
     required: false
     default: 'tests'
+  collapsed:
+    description: |
+      Controls whether test report details are collapsed or expanded. Supported options:
+        - auto: Collapse only if all tests pass (default behavior)
+        - always: Always collapse the report details
+        - never: Always expand the report details
+    required: false
+    default: 'auto'
   token:
     description: GitHub Access Token
     required: false
diff --git a/dist/index.js b/dist/index.js
index d5914fe..7a5188d 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -309,6 +309,7 @@ class TestReporter {
     useActionsSummary = core.getInput('use-actions-summary', { required: false }) === 'true';
     badgeTitle = core.getInput('badge-title', { required: false });
     reportTitle = core.getInput('report-title', { required: false });
+    collapsed = core.getInput('collapsed', { required: false });
     token = core.getInput('token', { required: true });
     octokit;
     context = (0, github_utils_1.getCheckRunContext)();
@@ -401,7 +402,7 @@ class TestReporter {
                 throw error;
             }
         }
-        const { listSuites, listTests, onlySummary, useActionsSummary, badgeTitle, reportTitle } = this;
+        const { listSuites, listTests, onlySummary, useActionsSummary, badgeTitle, reportTitle, collapsed } = this;
         const passed = results.reduce((sum, tr) => sum + tr.passed, 0);
         const failed = results.reduce((sum, tr) => sum + tr.failed, 0);
         const skipped = results.reduce((sum, tr) => sum + tr.skipped, 0);
@@ -415,7 +416,8 @@ class TestReporter {
                 onlySummary,
                 useActionsSummary,
                 badgeTitle,
-                reportTitle
+                reportTitle,
+                collapsed
             });
             core.info('Summary content:');
             core.info(summary);
@@ -443,7 +445,8 @@ class TestReporter {
                 onlySummary,
                 useActionsSummary,
                 badgeTitle,
-                reportTitle
+                reportTitle,
+                collapsed
             });
             core.info('Creating annotations');
             const annotations = (0, get_annotations_1.getAnnotations)(results, this.maxAnnotations);
@@ -1924,7 +1927,8 @@ exports.DEFAULT_OPTIONS = {
     onlySummary: false,
     useActionsSummary: true,
     badgeTitle: 'tests',
-    reportTitle: ''
+    reportTitle: '',
+    collapsed: 'auto'
 };
 function getReport(results, options = exports.DEFAULT_OPTIONS) {
     core.info('Generating check run summary');
@@ -2031,7 +2035,10 @@ function getBadge(passed, failed, skipped, options) {
 function getTestRunsReport(testRuns, options) {
     const sections = [];
     const totalFailed = testRuns.reduce((sum, tr) => sum + tr.failed, 0);
-    if (totalFailed === 0) {
+    // Determine if report should be collapsed based on collapsed option
+    const shouldCollapse = options.collapsed === 'always' ||
+        (options.collapsed === 'auto' && totalFailed === 0);
+    if (shouldCollapse) {
         sections.push(`<details><summary>Expand for details</summary>`);
         sections.push(` `);
     }
@@ -2056,7 +2063,7 @@ function getTestRunsReport(testRuns, options) {
         const suitesReports = testRuns.map((tr, i) => getSuitesReport(tr, i, options)).flat();
         sections.push(...suitesReports);
     }
-    if (totalFailed === 0) {
+    if (shouldCollapse) {
         sections.push(`</details>`);
     }
     return sections;
diff --git a/src/main.ts b/src/main.ts
index 57137ab..1dccea7 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -49,6 +49,7 @@ class TestReporter {
   readonly useActionsSummary = core.getInput('use-actions-summary', {required: false}) === 'true'
   readonly badgeTitle = core.getInput('badge-title', {required: false})
   readonly reportTitle = core.getInput('report-title', {required: false})
+  readonly collapsed = core.getInput('collapsed', {required: false}) as 'auto' | 'always' | 'never'
   readonly token = core.getInput('token', {required: true})
   readonly octokit: InstanceType<typeof GitHub>
   readonly context = getCheckRunContext()
@@ -166,7 +167,7 @@ class TestReporter {
       }
     }
 
-    const {listSuites, listTests, onlySummary, useActionsSummary, badgeTitle, reportTitle} = this
+    const {listSuites, listTests, onlySummary, useActionsSummary, badgeTitle, reportTitle, collapsed} = this
 
     const passed = results.reduce((sum, tr) => sum + tr.passed, 0)
     const failed = results.reduce((sum, tr) => sum + tr.failed, 0)
@@ -182,7 +183,8 @@ class TestReporter {
         onlySummary,
         useActionsSummary,
         badgeTitle,
-        reportTitle
+        reportTitle,
+        collapsed
       })
 
       core.info('Summary content:')
@@ -211,7 +213,8 @@ class TestReporter {
         onlySummary,
         useActionsSummary,
         badgeTitle,
-        reportTitle
+        reportTitle,
+        collapsed
       })
 
       core.info('Creating annotations')
diff --git a/src/report/get-report.ts b/src/report/get-report.ts
index 5168b7a..08bea71 100644
--- a/src/report/get-report.ts
+++ b/src/report/get-report.ts
@@ -16,6 +16,7 @@ export interface ReportOptions {
   useActionsSummary: boolean
   badgeTitle: string
   reportTitle: string
+  collapsed: 'auto' | 'always' | 'never'
 }
 
 export const DEFAULT_OPTIONS: ReportOptions = {
@@ -25,7 +26,8 @@ export const DEFAULT_OPTIONS: ReportOptions = {
   onlySummary: false,
   useActionsSummary: true,
   badgeTitle: 'tests',
-  reportTitle: ''
+  reportTitle: '',
+  collapsed: 'auto'
 }
 
 export function getReport(results: TestRunResult[], options: ReportOptions = DEFAULT_OPTIONS): string {
@@ -154,7 +156,13 @@ export function getBadge(passed: number, failed: number, skipped: number, option
 function getTestRunsReport(testRuns: TestRunResult[], options: ReportOptions): string[] {
   const sections: string[] = []
   const totalFailed = testRuns.reduce((sum, tr) => sum + tr.failed, 0)
-  if (totalFailed === 0) {
+
+  // Determine if report should be collapsed based on collapsed option
+  const shouldCollapse =
+    options.collapsed === 'always' ||
+    (options.collapsed === 'auto' && totalFailed === 0)
+
+  if (shouldCollapse) {
     sections.push(`<details><summary>Expand for details</summary>`)
     sections.push(` `)
   }
@@ -187,7 +195,7 @@ function getTestRunsReport(testRuns: TestRunResult[], options: ReportOptions): s
     sections.push(...suitesReports)
   }
 
-  if (totalFailed === 0) {
+  if (shouldCollapse) {
     sections.push(`</details>`)
   }
   return sections