diff --git a/.ralph-tui/config.toml b/.ralph-tui/config.toml
index ced8801..956f0d4 100644
--- a/.ralph-tui/config.toml
+++ b/.ralph-tui/config.toml
@@ -4,7 +4,8 @@
 
 configVersion = "2.1"
 tracker = "json"
-agent = "opencode"
+agent = "codex"
+model = "gpt-5.6-terra"
 maxIterations = 0
 autoCommit = true