diff --git a/packages/adapters/codex-local/src/index.ts b/packages/adapters/codex-local/src/index.ts
index a3d1eceea5..6af08521c2 100644
--- a/packages/adapters/codex-local/src/index.ts
+++ b/packages/adapters/codex-local/src/index.ts
@@ -40,6 +40,7 @@ export function isCodexLocalFastModeSupported(model: string | null | undefined):
 export const models = [
   { id: DEFAULT_CODEX_LOCAL_MODEL, label: DEFAULT_CODEX_LOCAL_MODEL },
   { id: "gpt-5.4", label: "gpt-5.4" },
+  { id: "gpt-5.4-mini", label: "gpt-5.4-mini" },
   { id: "gpt-5.3-codex-spark", label: "gpt-5.3-codex-spark" },
   { id: "gpt-5", label: "gpt-5" },
   { id: "o3", label: "o3" },
diff --git a/packages/adapters/codex-local/src/server/codex-args.test.ts b/packages/adapters/codex-local/src/server/codex-args.test.ts
index 46a9890d91..53a86a3455 100644
--- a/packages/adapters/codex-local/src/server/codex-args.test.ts
+++ b/packages/adapters/codex-local/src/server/codex-args.test.ts
@@ -109,6 +109,23 @@ describe("buildCodexExecArgs", () => {
     ]);
   });
 
+  it("ignores fast mode for gpt-5.4-mini", () => {
+    const result = buildCodexExecArgs({
+      model: "gpt-5.4-mini",
+      fastMode: true,
+    });
+
+    expect(result.fastModeRequested).toBe(true);
+    expect(result.fastModeApplied).toBe(false);
+    expect(result.args).toEqual([
+      "exec",
+      "--json",
+      "--model",
+      "gpt-5.4-mini",
+      "-",
+    ]);
+  });
+
   it("adds --skip-git-repo-check when requested", () => {
     const result = buildCodexExecArgs(
       {
diff --git a/packages/adapters/opencode-local/src/index.ts b/packages/adapters/opencode-local/src/index.ts
index 18c2df6740..bb0e60171c 100644
--- a/packages/adapters/opencode-local/src/index.ts
+++ b/packages/adapters/opencode-local/src/index.ts
@@ -55,7 +55,9 @@ export function isValidOpenCodeModelId(value: unknown): value is string {
 
 export const models: Array<{ id: string; label: string }> = [
   { id: DEFAULT_OPENCODE_LOCAL_MODEL, label: DEFAULT_OPENCODE_LOCAL_MODEL },
+  { id: "openai/gpt-5.5", label: "openai/gpt-5.5" },
   { id: "openai/gpt-5.4", label: "openai/gpt-5.4" },
+  { id: "openai/gpt-5.4-mini", label: "openai/gpt-5.4-mini" },
   { id: "openai/gpt-5.2", label: "openai/gpt-5.2" },
   { id: "openai/gpt-5.1-codex-max", label: "openai/gpt-5.1-codex-max" },
   { id: "openai/gpt-5.1-codex-mini", label: "openai/gpt-5.1-codex-mini" },