diff --git a/modules/ai/omp.nix b/modules/ai/omp.nix
index b8ef4c0..5e67e80 100644
--- a/modules/ai/omp.nix
+++ b/modules/ai/omp.nix
@@ -91,5 +91,39 @@ in
       Never read or write anything in the vault outside `vault://_/Agents/` — including vault-wide
       searches — without explicit user approval in the conversation.
     '';
+
+    # Upstream catalog gap (can1357/oh-my-pi#9910): zai/glm-5.3-flash is served by
+    # api.z.ai/api/anthropic but missing from the bundled models.json (static provider,
+    # no runtime discovery). Verified by headless completion 2026-08-27; remove when
+    # `omp models find glm-5.3` lists it under zai after an input update.
+    home.file.".omp/agent/models.yml".text = ''
+      providers:
+        zai:
+          auth: oauth
+          api: anthropic-messages
+          baseUrl: https://api.z.ai/api/anthropic
+          models:
+            - id: glm-5.3-flash
+              name: GLM-5.3 Flash
+              reasoning: true
+              input:
+                - text
+                - image
+              thinking:
+                mode: effort
+                efforts:
+                  - low
+                  - high
+                  - max
+                requiresEffort: true
+              supportsTools: true
+              contextWindow: 1000000
+              maxTokens: 131072
+              cost:
+                input: 0.075
+                output: 0.25
+                cacheRead: 0.015
+                cacheWrite: 0
+    '';
   };
 }