diff --git a/agents/coil-public-knowledge.yaml b/agents/coil-public-knowledge.yaml
index ebc9bd7..b1046ba 100644
--- a/agents/coil-public-knowledge.yaml
+++ b/agents/coil-public-knowledge.yaml
@@ -38,7 +38,7 @@ runner:
   skillSources: []
   dreaming:
     trigger: off
-  model: letta/auto
+  model: chatgpt-plus-pro/gpt-5.6-luna
   maxOutputTokens: 2000
   timeoutMs: 180000
 accounting:
diff --git a/test/public-knowledge-consumer.test.ts b/test/public-knowledge-consumer.test.ts
index ae20633..0cb23ef 100644
--- a/test/public-knowledge-consumer.test.ts
+++ b/test/public-knowledge-consumer.test.ts
@@ -160,7 +160,7 @@ describe("Coil Public Knowledge consumer", () => {
       cwd: "/tmp/co-memory",
       env: { MEMORY_DIR: "/tmp/co-memory" },
       filesystemConfinement: "memory",
-      model: "letta/auto",
+      model: "chatgpt-plus-pro/gpt-5.6-luna",
     });
     const [binding] = await fixture.store.listLettaConversationBindings();
     expect(binding).toMatchObject({
@@ -375,7 +375,7 @@ function publicKnowledgeDeclaration(): ThoughtAgentDeclaration {
     description: "Fixture",
     mode: "letta-agent-sdk",
     provider: "letta-local",
-    model: "letta/auto",
+    model: "chatgpt-plus-pro/gpt-5.6-luna",
     outputContract: { ...PUBLIC_KNOWLEDGE_RECOMMENDATION_OUTPUT_CONTRACT.identity },
     lettaAgent: {
       backend: "local",