diff --git a/CHANGELOG.md b/CHANGELOG.md
index 815a17f..7835fed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## 3.1.0
 * Feature: Add `list-files` input to control test report file listing https://github.com/dorny/test-reporter/pull/773
-* Feature: Add `summary` output with the generated summary in Markdown format https://github.com/dorny/test-reporter/pull/772
+* Feature: Add `summary_file` output with the path to the generated summary in Markdown format https://github.com/dorny/test-reporter/pull/772
 
 ## 3.0.0
 * Feature: Use NodeJS 24 LTS as default runtime https://github.com/dorny/test-reporter/pull/738
diff --git a/README.md b/README.md
index a7e4674..f6624d8 100644
--- a/README.md
+++ b/README.md
@@ -225,7 +225,7 @@ jobs:
 | time       | Test execution time [ms] |
 | url        | Check run URL            |
 | url_html   | Check run URL HTML       |
-| summary    | Generated test report summary in Markdown format |
+| summary_file | Path to a file containing the generated test report summary in Markdown format |
 | slug_prefix| Random anchor links slug prefix generated for the summary headers |
 
 ## Supported formats
diff --git a/action.yml b/action.yml
index ef1aeff..fb11227 100644
--- a/action.yml
+++ b/action.yml
@@ -130,8 +130,8 @@ outputs:
     description: Check run URL
   url_html:
     description: Check run URL HTML
-  summary:
-    description: Generated test report summary in Markdown format
+  summary_file:
+    description: Path to a file containing the generated test report summary in Markdown format
   slug_prefix:
     description: Random prefix added to generated report anchor slugs for this action run
 runs:
diff --git a/src/main.ts b/src/main.ts
index f6cfcc0..62da4bc 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -2,6 +2,9 @@ import * as core from '@actions/core'
 import * as github from '@actions/github'
 import {GitHub} from '@actions/github/lib/utils'
 import {randomBytes} from 'node:crypto'
+import {writeFileSync} from 'node:fs'
+import {tmpdir} from 'node:os'
+import {join} from 'node:path'
 
 import {ArtifactProvider} from './input-providers/artifact-provider.js'
 import {LocalFileProvider} from './input-providers/local-file-provider.js'
@@ -221,7 +224,7 @@ class TestReporter {
 
       core.info('Summary content:')
       core.info(summary)
-      core.setOutput('summary', summary)
+      this.writeSummaryFile(summary)
       await core.summary.addRaw(summary).write()
     } else {
       core.info(`Creating check run ${name}`)
@@ -253,7 +256,7 @@ class TestReporter {
 
       core.info('Creating annotations')
       const annotations = getAnnotations(results, this.maxAnnotations)
-      core.setOutput('summary', summary)
+      this.writeSummaryFile(summary)
 
       const isFailed = this.failOnError && results.some(tr => tr.result === 'failed')
       const conclusion = isFailed ? 'failure' : 'success'
@@ -280,6 +283,14 @@ class TestReporter {
     return results
   }
 
+  writeSummaryFile(summary: string): void {
+    const dir = process.env.RUNNER_TEMP || tmpdir()
+    const file = join(dir, `test-reporter-summary-${randomBytes(8).toString('hex')}.md`)
+    writeFileSync(file, summary)
+    core.info(`Summary written to ${file}`)
+    core.setOutput('summary_file', file)
+  }
+
   getParser(reporter: string, options: ParseOptions): TestParser {
     switch (reporter) {
       case 'dart-json':