diff --git a/src/agents/orchestrator-sisyphus.ts b/src/agents/orchestrator-sisyphus.ts
index 12b389f4..86105599 100644
--- a/src/agents/orchestrator-sisyphus.ts
+++ b/src/agents/orchestrator-sisyphus.ts
@@ -1442,7 +1442,7 @@ export function createOrchestratorSisyphusAgent(ctx?: OrchestratorContext): Agen
     description:
       "Orchestrates work via sisyphus_task() to complete ALL tasks in a todo list until fully done",
     mode: "primary" as const,
-    model: "anthropic/claude-opus-4-5",
+    model: "anthropic/claude-sonnet-4-5",
     temperature: 0.1,
     prompt: buildDynamicOrchestratorPrompt(ctx),
     thinking: { type: "enabled", budgetTokens: 32000 },