diff --git a/open-sse/config/providers/registry/github/index.ts b/open-sse/config/providers/registry/github/index.ts
index e4f6f7e563..1dc6a22764 100644
--- a/open-sse/config/providers/registry/github/index.ts
+++ b/open-sse/config/providers/registry/github/index.ts
@@ -114,6 +114,9 @@ export const githubProvider: RegistryEntry = {
       contextLength: 1000000,
       maxOutputTokens: 64000,
     },
+    { id: "gpt-5.6-sol", name: "GPT-5.6 Sol", maxOutputTokens: 128000 },
+    { id: "gpt-5.6-terra", name: "GPT-5.6 Terra", maxOutputTokens: 128000 },
+    { id: "gpt-5.6-luna", name: "GPT-5.6 Luna", maxOutputTokens: 128000 },
     { id: "gpt-5.5", name: "GPT-5.5", ...GPT_5_5_CODEX_CAPABILITIES, maxOutputTokens: 128000 },
     {
       id: "gpt-5.4",
diff --git a/open-sse/services/githubCopilotModels.ts b/open-sse/services/githubCopilotModels.ts
index be7994bfb9..766666ecbe 100644
--- a/open-sse/services/githubCopilotModels.ts
+++ b/open-sse/services/githubCopilotModels.ts
@@ -32,6 +32,9 @@ export const GITHUB_COPILOT_MODEL_ALLOWLIST = [
   "claude-haiku-4.5",
   "gemini-3.1-pro-preview",
   "gemini-3.5-flash",
+  "gpt-5.6-sol",
+  "gpt-5.6-terra",
+  "gpt-5.6-luna",
   "gpt-5.5",
   "gpt-5.4",
   "gpt-5.4-mini",
@@ -206,7 +209,11 @@ export function parseGheCopilotModels(data: unknown): GitHubCopilotModel[] {
       toNonEmptyString(item.display_name) ||
       toNonEmptyString(item.label) ||
       id;
-    models.push({ id, name, owned_by: toNonEmptyString(item.vendor || item.provider) || "ghe-copilot" });
+    models.push({
+      id,
+      name,
+      owned_by: toNonEmptyString(item.vendor || item.provider) || "ghe-copilot",
+    });
   }
 
   return models;
diff --git a/tests/unit/github-copilot-model-discovery.test.ts b/tests/unit/github-copilot-model-discovery.test.ts
index bf3ed4c43c..1c612eb7ab 100644
--- a/tests/unit/github-copilot-model-discovery.test.ts
+++ b/tests/unit/github-copilot-model-discovery.test.ts
@@ -140,6 +140,9 @@ test("curated Copilot allowlist contains the final approved model ids only", ()
       "claude-haiku-4.5",
       "gemini-3.1-pro-preview",
       "gemini-3.5-flash",
+      "gpt-5.6-sol",
+      "gpt-5.6-terra",
+      "gpt-5.6-luna",
       "gpt-5.5",
       "gpt-5.4",
       "gpt-5.4-mini",
@@ -155,6 +158,24 @@ test("curated Copilot allowlist contains the final approved model ids only", ()
   );
 });
 
+test("newly approved Copilot models survive live and fallback discovery", async () => {
+  const expected = ["gpt-5.6-sol", "gpt-5.6-terra", "gpt-5.6-luna"];
+  const live = parseGitHubCopilotModels({ data: expected.map((id) => ({ id, name: id })) });
+  assert.deepEqual(
+    live.map((model) => model.id),
+    expected
+  );
+
+  const fallback = await fetchGitHubCopilotModels({
+    token: "",
+    fallbackModels: expected.map((id) => ({ id, name: id })),
+  });
+  assert.deepEqual(
+    fallback.models.map((model) => model.id),
+    expected
+  );
+});
+
 test("fetch falls back when no token is provided (unauthed refresh stays safe)", async () => {
   let called = false;
   const fakeFetch = (async () => {