diff --git a/lua/cp/config.lua b/lua/cp/config.lua
index d92c267..0616e9f 100644
--- a/lua/cp/config.lua
+++ b/lua/cp/config.lua
@@ -36,6 +36,7 @@
 ---@field next_test_key string Key to navigate to next test case
 ---@field prev_test_key string Key to navigate to previous test case
 ---@field toggle_diff_key string Key to toggle diff mode
+---@field max_output_lines number Maximum lines of test output to display
 
 ---@class DiffGitConfig
 ---@field command string Git executable name
@@ -84,6 +85,7 @@ M.defaults = {
     next_test_key = '<c-n>',
     prev_test_key = '<c-p>',
     toggle_diff_key = 't',
+    max_output_lines = 50,
   },
   diff = {
     git = {
@@ -203,6 +205,13 @@ function M.setup(user_config)
       end,
       'toggle_diff_key must be a non-empty string',
     },
+    max_output_lines = {
+      config.run_panel.max_output_lines,
+      function(value)
+        return type(value) == 'number' and value > 0 and value == math.floor(value)
+      end,
+      'max_output_lines must be a positive integer',
+    },
   })
 
   vim.validate({
diff --git a/lua/cp/test.lua b/lua/cp/test.lua
index 329f03c..385a105 100644
--- a/lua/cp/test.lua
+++ b/lua/cp/test.lua
@@ -118,7 +118,7 @@ end
 ---@param contest_config ContestConfig
 ---@param test_case TestCase
 ---@return table
-local function run_single_test_case(ctx, contest_config, test_case)
+local function run_single_test_case(ctx, contest_config, cp_config, test_case)
   local language = vim.fn.fnamemodify(ctx.source_file, ':e')
   local language_name = constants.filetype_to_language[language] or contest_config.default_language
   local language_config = contest_config[language_name]
@@ -187,6 +187,18 @@ local function run_single_test_case(ctx, contest_config, test_case)
   local execution_time = (vim.uv.hrtime() - start_time) / 1000000
 
   local actual_output = (result.stdout or ''):gsub('\n$', '')
+
+  local max_lines = cp_config.run_panel.max_output_lines
+  local output_lines = vim.split(actual_output, '\n')
+  if #output_lines > max_lines then
+    local trimmed_lines = {}
+    for i = 1, max_lines do
+      table.insert(trimmed_lines, output_lines[i])
+    end
+    table.insert(trimmed_lines, string.format('... (output trimmed after %d lines)', max_lines))
+    actual_output = table.concat(trimmed_lines, '\n')
+  end
+
   local expected_output = test_case.expected:gsub('\n$', '')
   local ok = actual_output == expected_output
 
@@ -238,7 +250,7 @@ end
 ---@param contest_config ContestConfig
 ---@param index number
 ---@return boolean
-function M.run_test_case(ctx, contest_config, index)
+function M.run_test_case(ctx, contest_config, cp_config, index)
   local test_case = run_panel_state.test_cases[index]
   if not test_case then
     return false