diff --git a/src/shared/model-requirements.ts b/src/shared/model-requirements.ts
index fc1f2486..a1bde297 100644
--- a/src/shared/model-requirements.ts
+++ b/src/shared/model-requirements.ts
@@ -65,7 +65,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   momus: {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "medium" },
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5" },
+      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
     ],
   },