diff --git a/devloop b/devloop
index 98e2ba7..e4ff81c 100755
--- a/devloop
+++ b/devloop
@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
 set -uo pipefail
 
-CODEX_MODEL_ARGS=(-m gpt-5.5)
+CODEX_MODEL_ARGS=(-m gpt-5.6-sol)
 CODEX_REASONING_ARGS=(-c 'model_reasoning_effort="xhigh"')
 CLAUDE_MODEL_ARGS=(--model claude-opus-4-8)
-CLAUDE_EFFORT_ARGS=(--effort max)
+CLAUDE_EFFORT_ARGS=(--effort xhigh)
 DEFAULT_TIMEOUT_MINUTES=30
 DEFAULT_SPEC_DIR=".devloop/specs"
 DEFAULT_CODER="codex"
diff --git a/scripts/devloop_test.sh b/scripts/devloop_test.sh
index 534409b..3bfec90 100755
--- a/scripts/devloop_test.sh
+++ b/scripts/devloop_test.sh
@@ -57,8 +57,10 @@ ok "bash syntax"
 DEVLOOP_LIB=1
 source "$REPO_ROOT/devloop"
 unset DEVLOOP_LIB
-equals "${CODEX_MODEL_ARGS[*]}" "-m gpt-5.5" "codex model args"
+equals "${CODEX_MODEL_ARGS[*]}" "-m gpt-5.6-sol" "codex model args"
+equals "${CODEX_REASONING_ARGS[*]}" '-c model_reasoning_effort="xhigh"' "codex reasoning args"
 equals "${CLAUDE_MODEL_ARGS[*]}" "--model claude-opus-4-8" "claude model args"
+equals "${CLAUDE_EFFORT_ARGS[*]}" "--effort xhigh" "claude effort args"
 
 version="$(sed -n '1p' "$REPO_ROOT/VERSION")"
 equals "$("$REPO_ROOT/devloop" --version)" "devloop $version" "version output"