diff --git a/containers/api-proxy/model-api-mapping.json b/containers/api-proxy/model-api-mapping.json
index 202789b8f..444aee014 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": "2026-07-01T08:18:06Z",
+  "lastUpdated": "2026-07-02T22:45:35Z",
   "sources": {
     "openai": "https://platform.openai.com/docs/models",
     "anthropic": "https://docs.anthropic.com/en/docs/about-claude/models"
@@ -28,38 +28,56 @@
         {
           "family": "gpt-5.4",
           "patterns": ["gpt-5.4*"],
-          "endpoints": ["responses"],
-          "notes": "Responses API only."
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints. Includes gpt-5.4-mini, gpt-5.4-nano."
         },
         {
           "family": "gpt-5.3",
           "patterns": ["gpt-5.3*"],
-          "endpoints": ["responses"],
-          "notes": "Responses API only. Includes gpt-5.3-codex variants."
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints. Only gpt-5.3-chat-latest confirmed in OpenAPI spec; gpt-5.3-codex variants not present."
         },
         {
           "family": "gpt-5.2",
           "patterns": ["gpt-5.2*"],
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints. Includes gpt-5.2-pro."
+        },
+        {
+          "family": "gpt-5.1-codex-max",
+          "patterns": ["gpt-5.1-codex-max"],
           "endpoints": ["responses"],
-          "notes": "Responses API only."
+          "notes": "Responses API only (ResponsesOnlyModel)."
         },
         {
           "family": "gpt-5.1",
           "patterns": ["gpt-5.1*"],
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints for gpt-5.1, gpt-5.1-codex, gpt-5.1-mini."
+        },
+        {
+          "family": "gpt-5-codex/pro",
+          "patterns": ["gpt-5-codex", "gpt-5-pro"],
           "endpoints": ["responses"],
-          "notes": "Responses API only. Includes gpt-5.1-codex, gpt-5.1-codex-max, gpt-5.1-codex-mini variants."
+          "notes": "Responses API only for gpt-5-codex and gpt-5-pro (ResponsesOnlyModel)."
         },
         {
           "family": "gpt-5",
           "patterns": ["gpt-5", "gpt-5-*"],
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints for gpt-5, gpt-5-mini, gpt-5-nano."
+        },
+        {
+          "family": "o4-mini-deep-research",
+          "patterns": ["o4-mini-deep-research"],
           "endpoints": ["responses"],
-          "notes": "Responses API only. Includes gpt-5-mini, gpt-5-nano, gpt-5-pro."
+          "notes": "Responses API only (ResponsesOnlyModel)."
         },
         {
           "family": "o4",
           "patterns": ["o4*"],
-          "endpoints": ["responses"],
-          "notes": "Reasoning model. Responses API only. Includes o4-mini."
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Reasoning model. o4-mini supports both endpoints (ModelIdsShared)."
         },
         {
           "family": "o3",
@@ -83,7 +101,7 @@
           "family": "gpt-4.1",
           "patterns": ["gpt-4.1*"],
           "endpoints": ["chat_completions", "responses"],
-          "notes": "Supports both endpoints."
+          "notes": "Supports both endpoints. Includes gpt-4.1-mini, gpt-4.1-nano."
         },
         {
           "family": "gpt-4.5",
diff --git a/containers/api-proxy/model-api-mapping.test.js b/containers/api-proxy/model-api-mapping.test.js
index eb29dc3f8..120db22e4 100644
--- a/containers/api-proxy/model-api-mapping.test.js
+++ b/containers/api-proxy/model-api-mapping.test.js
@@ -33,10 +33,32 @@ describe('model-api-mapping', () => {
       expect(result.endpoints).toEqual(['responses']);
     });
 
-    it('finds GPT-5.1 as responses-only', () => {
+    it('finds GPT-5.1 as supporting both endpoints', () => {
       const result = lookupModelEndpoints('gpt-5.1-codex', 'openai');
       expect(result).not.toBeNull();
       expect(result.family).toBe('gpt-5.1');
+      expect(result.endpoints).toContain('chat_completions');
+      expect(result.endpoints).toContain('responses');
+    });
+
+    it('finds GPT-5.1-codex-max as responses-only', () => {
+      const result = lookupModelEndpoints('gpt-5.1-codex-max', 'openai');
+      expect(result).not.toBeNull();
+      expect(result.family).toBe('gpt-5.1-codex-max');
+      expect(result.endpoints).toEqual(['responses']);
+    });
+
+    it('finds GPT-5-codex as responses-only', () => {
+      const result = lookupModelEndpoints('gpt-5-codex', 'openai');
+      expect(result).not.toBeNull();
+      expect(result.family).toBe('gpt-5-codex/pro');
+      expect(result.endpoints).toEqual(['responses']);
+    });
+
+    it('finds o4-mini-deep-research as responses-only', () => {
+      const result = lookupModelEndpoints('o4-mini-deep-research', 'openai');
+      expect(result).not.toBeNull();
+      expect(result.family).toBe('o4-mini-deep-research');
       expect(result.endpoints).toEqual(['responses']);
     });
 
@@ -89,7 +111,7 @@ describe('model-api-mapping', () => {
       expect(reflect.available).toBe(true);
       expect(reflect.providers).toContain('openai');
       expect(reflect.providers).toContain('anthropic');
-      expect(reflect.last_updated).toBe('2026-07-01T08:18:06Z');
+      expect(reflect.last_updated).toBe('2026-07-02T22:45:35Z');
       expect(reflect.error).toBeNull();
     });
   });
diff --git a/docs/model-api-mapping.json b/docs/model-api-mapping.json
index 202789b8f..444aee014 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": "2026-07-01T08:18:06Z",
+  "lastUpdated": "2026-07-02T22:45:35Z",
   "sources": {
     "openai": "https://platform.openai.com/docs/models",
     "anthropic": "https://docs.anthropic.com/en/docs/about-claude/models"
@@ -28,38 +28,56 @@
         {
           "family": "gpt-5.4",
           "patterns": ["gpt-5.4*"],
-          "endpoints": ["responses"],
-          "notes": "Responses API only."
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints. Includes gpt-5.4-mini, gpt-5.4-nano."
         },
         {
           "family": "gpt-5.3",
           "patterns": ["gpt-5.3*"],
-          "endpoints": ["responses"],
-          "notes": "Responses API only. Includes gpt-5.3-codex variants."
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints. Only gpt-5.3-chat-latest confirmed in OpenAPI spec; gpt-5.3-codex variants not present."
         },
         {
           "family": "gpt-5.2",
           "patterns": ["gpt-5.2*"],
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints. Includes gpt-5.2-pro."
+        },
+        {
+          "family": "gpt-5.1-codex-max",
+          "patterns": ["gpt-5.1-codex-max"],
           "endpoints": ["responses"],
-          "notes": "Responses API only."
+          "notes": "Responses API only (ResponsesOnlyModel)."
         },
         {
           "family": "gpt-5.1",
           "patterns": ["gpt-5.1*"],
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints for gpt-5.1, gpt-5.1-codex, gpt-5.1-mini."
+        },
+        {
+          "family": "gpt-5-codex/pro",
+          "patterns": ["gpt-5-codex", "gpt-5-pro"],
           "endpoints": ["responses"],
-          "notes": "Responses API only. Includes gpt-5.1-codex, gpt-5.1-codex-max, gpt-5.1-codex-mini variants."
+          "notes": "Responses API only for gpt-5-codex and gpt-5-pro (ResponsesOnlyModel)."
         },
         {
           "family": "gpt-5",
           "patterns": ["gpt-5", "gpt-5-*"],
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Supports both endpoints for gpt-5, gpt-5-mini, gpt-5-nano."
+        },
+        {
+          "family": "o4-mini-deep-research",
+          "patterns": ["o4-mini-deep-research"],
           "endpoints": ["responses"],
-          "notes": "Responses API only. Includes gpt-5-mini, gpt-5-nano, gpt-5-pro."
+          "notes": "Responses API only (ResponsesOnlyModel)."
         },
         {
           "family": "o4",
           "patterns": ["o4*"],
-          "endpoints": ["responses"],
-          "notes": "Reasoning model. Responses API only. Includes o4-mini."
+          "endpoints": ["chat_completions", "responses"],
+          "notes": "Reasoning model. o4-mini supports both endpoints (ModelIdsShared)."
         },
         {
           "family": "o3",
@@ -83,7 +101,7 @@
           "family": "gpt-4.1",
           "patterns": ["gpt-4.1*"],
           "endpoints": ["chat_completions", "responses"],
-          "notes": "Supports both endpoints."
+          "notes": "Supports both endpoints. Includes gpt-4.1-mini, gpt-4.1-nano."
         },
         {
           "family": "gpt-4.5",