diff --git a/lib/public/modules/app-panels.js b/lib/public/modules/app-panels.js
index 450d36db..2e722305 100644
--- a/lib/public/modules/app-panels.js
+++ b/lib/public/modules/app-panels.js
@@ -108,6 +108,7 @@ var CODEX_WEBSEARCH_OPTIONS = [
 var KNOWN_CONTEXT_WINDOWS = {
   "opus-4-6": 1000000,
   "claude-sonnet-4": 1000000,
+  "gpt-5.6": 272000,
   "gpt-5.5": 1048576,
   "gpt-5.4": 1048576,
   "gpt-5.3": 1048576,
diff --git a/lib/yoke/adapters/codex.js b/lib/yoke/adapters/codex.js
index d46b6f19..40aade0c 100644
--- a/lib/yoke/adapters/codex.js
+++ b/lib/yoke/adapters/codex.js
@@ -620,7 +620,7 @@ function createCodexQueryHandle(appServer, queryOpts) {
     done: false,
     aborted: false,
     loopStarted: false,
-    model: queryOpts.model || "gpt-5.5",
+    model: queryOpts.model || "gpt-5.6-terra",
     // Track incremental text deltas
     textBlocks: {},     // itemId -> true (text_start sent)
     textLengths: {},    // itemId -> last sent length
@@ -865,7 +865,7 @@ function createCodexQueryHandle(appServer, queryOpts) {
 
       // Start or resume thread
       var threadParams = {
-        model: queryOpts.model || "gpt-5.5",
+        model: queryOpts.model || "gpt-5.6-terra",
         sandbox: queryOpts.sandboxMode || "workspace-write",
         approvalPolicy: queryOpts.approvalPolicy || "on-failure",
         cwd: queryOpts.cwd,
@@ -1086,6 +1086,9 @@ function createCodexAdapter(opts) {
   // slow/failed `initialize` leaves the picker empty and the chip shows the
   // previous vendor's model.
   var CODEX_MODELS = [
+    "gpt-5.6-terra",
+    "gpt-5.6-sol",
+    "gpt-5.6-luna",
     "gpt-5.5",
     "gpt-5.4",
     "gpt-5.4-mini",
@@ -1131,7 +1134,7 @@ function createCodexAdapter(opts) {
   function buildReadyResponse(skillNames) {
     return {
       models: _cachedModels,
-      defaultModel: "gpt-5.5",
+      defaultModel: "gpt-5.6-terra",
       skills: skillNames || [],
       slashCommands: skillNames || [],
       fastModeState: null,
@@ -1428,7 +1431,7 @@ function createCodexAdapter(opts) {
         throw new Error("[yoke/codex] Adapter not initialized. Call init() first.");
       }
 
-      var model = queryOpts.model || "gpt-5.5";
+      var model = queryOpts.model || "gpt-5.6-terra";
       var ac = queryOpts.abortController || new AbortController();
       var activeEntry = {
         abort: function() {