diff --git a/containers/api-proxy/model-api-mapping.json b/containers/api-proxy/model-api-mapping.json
index 5feb40d60..f3776155f 100644
--- a/containers/api-proxy/model-api-mapping.json
+++ b/containers/api-proxy/model-api-mapping.json
@@ -1,7 +1,7 @@
 {
   "title": "Model-to-API Endpoint Mapping",
   "description": "Maps AI model families to their supported API endpoints. Used to determine which endpoint (chat/completions vs responses vs messages) a model requires.",
-  "lastUpdated": "2026-07-25T06:01:17Z",
+  "lastUpdated": "2026-08-12T05:43:00Z",
   "sources": {
     "openai": "https://platform.openai.com/docs/models",
     "anthropic": "https://docs.anthropic.com/en/docs/about-claude/models"
@@ -19,11 +19,23 @@
         }
       },
       "models": [
+        {
+          "family": "gpt-daybreak",
+          "patterns": ["gpt-daybreak-blue-latest", "gpt-daybreak-red-latest"],
+          "endpoints": ["responses"],
+          "notes": "Responses API only (ResponsesModel-only Literal). Experimental/preview aliases not present in ChatModel."
+        },
+        {
+          "family": "gpt-5.6-cyber",
+          "patterns": ["gpt-5.6-cyber*"],
+          "endpoints": ["responses"],
+          "notes": "Responses API only (ResponsesModel-only Literal, not in ChatModel). More specific than gpt-5.6* pattern below."
+        },
         {
           "family": "gpt-5.6",
           "patterns": ["gpt-5.6*"],
           "endpoints": ["chat_completions", "responses"],
-          "notes": "Supports both endpoints. Includes gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna per OpenAI SDK ChatModel."
+          "notes": "Supports both endpoints. Includes gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna per OpenAI SDK ChatModel. gpt-5.6-cyber is responses-only (see separate entry above)."
         },
         {
           "family": "gpt-5.5",
diff --git a/containers/api-proxy/model-api-mapping.test.js b/containers/api-proxy/model-api-mapping.test.js
index 897114763..2a66dadef 100644
--- a/containers/api-proxy/model-api-mapping.test.js
+++ b/containers/api-proxy/model-api-mapping.test.js
@@ -136,7 +136,7 @@ describe('model-api-mapping', () => {
       expect(reflect.available).toBe(true);
       expect(reflect.providers).toContain('openai');
       expect(reflect.providers).toContain('anthropic');
-      expect(reflect.last_updated).toBe('2026-07-25T06:01:17Z');
+      expect(reflect.last_updated).toBe('2026-08-12T05:43:00Z');
       expect(reflect.models.anthropic.models[0].family).toBe('claude-opus-5');
       expect(reflect.error).toBeNull();
     });
diff --git a/docs/model-api-mapping.json b/docs/model-api-mapping.json
index cc48bc04d..f3776155f 100644
--- a/docs/model-api-mapping.json
+++ b/docs/model-api-mapping.json
@@ -1,7 +1,7 @@
 {
   "title": "Model-to-API Endpoint Mapping",
   "description": "Maps AI model families to their supported API endpoints. Used to determine which endpoint (chat/completions vs responses vs messages) a model requires.",
-  "lastUpdated": "2026-08-05T06:03:21Z",
+  "lastUpdated": "2026-08-12T05:43:00Z",
   "sources": {
     "openai": "https://platform.openai.com/docs/models",
     "anthropic": "https://docs.anthropic.com/en/docs/about-claude/models"
@@ -19,11 +19,23 @@
         }
       },
       "models": [
+        {
+          "family": "gpt-daybreak",
+          "patterns": ["gpt-daybreak-blue-latest", "gpt-daybreak-red-latest"],
+          "endpoints": ["responses"],
+          "notes": "Responses API only (ResponsesModel-only Literal). Experimental/preview aliases not present in ChatModel."
+        },
+        {
+          "family": "gpt-5.6-cyber",
+          "patterns": ["gpt-5.6-cyber*"],
+          "endpoints": ["responses"],
+          "notes": "Responses API only (ResponsesModel-only Literal, not in ChatModel). More specific than gpt-5.6* pattern below."
+        },
         {
           "family": "gpt-5.6",
           "patterns": ["gpt-5.6*"],
           "endpoints": ["chat_completions", "responses"],
-          "notes": "Supports both endpoints. Includes gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna per OpenAI SDK ChatModel."
+          "notes": "Supports both endpoints. Includes gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna per OpenAI SDK ChatModel. gpt-5.6-cyber is responses-only (see separate entry above)."
         },
         {
           "family": "gpt-5.5",
diff --git a/src/copilot-model-catalog-sync.test.ts b/src/copilot-model-catalog-sync.test.ts
index 991918fbe..6e4cdd966 100644
--- a/src/copilot-model-catalog-sync.test.ts
+++ b/src/copilot-model-catalog-sync.test.ts
@@ -75,6 +75,8 @@ const SUPPORTED_WITHOUT_CURATED_PRICING = new Set([
 ]);
 
 const MAPPING_FAMILIES_NOT_EXPOSED_BY_COPILOT_CLI = new Set([
+  'gpt-daybreak', // responses-only preview aliases; not in the Copilot CLI model picker
+  'gpt-5-6-cyber', // responses-only gpt-5.6 variant; not in the Copilot CLI model picker
   'gpt-5-1-codex-max',
   'gpt-5-codex/pro',
   'o4-mini-deep-research',