diff --git a/doc/cp.nvim.txt b/doc/cp.nvim.txt
index e85ea45..49cdaf7 100644
--- a/doc/cp.nvim.txt
+++ b/doc/cp.nvim.txt
@@ -143,7 +143,7 @@ run CSES problems with Rust using the single schema:
                         (default: concatenates contest_id and problem_id, lowercased)
         {ui}            (|CpUI|) UI settings: panel, diff backend, picker.
         {open_url}      (boolean) Open the contest & problem url in the browser
-                        when the contest is first opened.
+                        when a new contest is opened or the active problem changes.
 
                                                                   *CpPlatform*
     Fields: ~
diff --git a/lua/cp/setup.lua b/lua/cp/setup.lua
index e3bb38d..deeadd9 100644
--- a/lua/cp/setup.lua
+++ b/lua/cp/setup.lua
@@ -121,6 +121,7 @@ end
 ---@param language? string
 function M.setup_contest(platform, contest_id, problem_id, language)
   local old_platform, old_contest_id = state.get_platform(), state.get_contest_id()
+  local old_problem_id = state.get_problem_id()
 
   state.set_platform(platform)
   state.set_contest_id(contest_id)
@@ -133,7 +134,7 @@ function M.setup_contest(platform, contest_id, problem_id, language)
     end
   end
 
-  local is_new_contest = old_platform ~= platform and old_contest_id ~= contest_id
+  local is_new_contest = old_platform ~= platform or old_contest_id ~= contest_id
 
   cache.load()
 
@@ -143,7 +144,9 @@ function M.setup_contest(platform, contest_id, problem_id, language)
     M.setup_problem(pid, language)
     start_tests(platform, contest_id, problems)
 
-    if config_module.get_config().open_url and is_new_contest and contest_data.url then
+    local is_new_problem = old_problem_id ~= pid
+    local should_open_url = config_module.get_config().open_url and (is_new_contest or is_new_problem)
+    if should_open_url and contest_data.url then
       vim.ui.open(contest_data.url:format(pid))
     end
   end