diff --git a/templates/chapter_polish.yml b/templates/chapter_polish.yml
index 69c1811..6b57f8f 100644
--- a/templates/chapter_polish.yml
+++ b/templates/chapter_polish.yml
@@ -2,7 +2,7 @@ name: chapter_polish
 description: >
   Iris polishes the chapter using the editorial consensus from the review roundtable.
 debug: true
-model: anthropic/claude-sonnet-4.6
+model: x-ai/grok-4
 system: agent_prompt
 
 skills: