diff --git a/zsh/functions/co.zsh b/zsh/functions/co.zsh
index 2749143..ce613ba 100644
--- a/zsh/functions/co.zsh
+++ b/zsh/functions/co.zsh
@@ -1,6 +1,6 @@
 co() {
   local -a codex_cmd
-  codex_cmd=(codex --sandbox danger-full-access -m gpt-5-codex -c 'model_reasoning_summary_format=experimental' -c 'model_reasoning_effort=medium' --search)
+  codex_cmd=(codex --sandbox danger-full-access -m gpt-5 -c 'model_reasoning_summary_format=experimental' -c 'model_reasoning_effort=high' --search)
   local search_dir=$PWD
   local overlay_file=""
   while :; do