fix(chatgpt-web): map advertised gpt-5.5/5.4-pro/5.2-pro slugs to prevent silent model substitution (#4665)

CHANGELOG.md

@@ -16,6 +16,7 @@ _In development — bullets added per PR; finalized at release._
 - **fix(dashboard):** on OAuth providers (e.g. GLM Coding), "Test all models" with auto-hide-failed now switches the model list to the "visible" filter after the run, so just-hidden failed models actually disappear on-screen — parity with the passthrough-provider path (#3610). Previously they were hidden in the DB but stayed visible under the "All" filter, so it looked like nothing was hidden. (#4887)
 - **fix(pollinations):** stop forcing `jsonMode` on every request. Pollinations treats `jsonMode=true` as "the model MUST return JSON" and rejects (HTTP 400 "messages must contain the word 'json'") any normal chat request whose messages don't mention "json", so all non-JSON chat was broken. `jsonMode` is now only enabled when the caller actually requests JSON output (`response_format.type` of `json_object` or `json_schema`). (#3981)
 - **fix(antigravity):** default `safetySettings` to all-OFF for parity with the native Gemini paths. The Antigravity (Google Cloud Code) request builder set `safetySettings: undefined`, which `JSON.stringify` drops — so no safety settings reached Google and its server-side defaults false-flagged benign technical prompts as `prohibited_content` (HTTP 200 + blocked body, which combo failover treats as terminal). Now honors a caller-supplied value and otherwise defaults to `DEFAULT_SAFETY_SETTINGS`, matching the claude-to-gemini / openai-to-gemini paths (#5003)
+- **fix(chatgpt-web):** map the advertised `gpt-5.5`, `gpt-5.5-pro`, `gpt-5.4-pro` and `gpt-5.2-pro` catalog ids to their dash-form ChatGPT backend slugs. They were missing from `MODEL_MAP`, so the executor sent the dot-form id verbatim, which the ChatGPT backend silently ignored and served the default Plus model instead of the requested one. Adds a drift guard asserting no advertised dot-form id reaches the backend verbatim. (#4665)
 
 ---
 

config/quality/file-size-baseline.json

@@ -240,7 +240,7 @@
     "tests/unit/cc-compatible-provider.test.ts": 1179,
     "tests/unit/chatcore-sanitization.test.ts": 829,
     "tests/unit/chatcore-translation-paths.test.ts": 2810,
-    "tests/unit/chatgpt-web.test.ts": 2809,
+    "tests/unit/chatgpt-web.test.ts": 2855,
     "tests/unit/combo-routing-engine.test.ts": 3213,
     "tests/unit/combo-strategy-fallbacks.test.ts": 880,
     "tests/unit/db-core-init.test.ts": 867,

open-sse/executors/chatgpt-web.ts

@@ -82,9 +82,13 @@ const MODEL_MAP: Record<string, string> = {
   "gpt-5.3-instant": "gpt-5-3-instant",
   "gpt-5.3": "gpt-5-3",
   "gpt-5.3-mini": "gpt-5-3-mini",
+  "gpt-5.5-pro": "gpt-5-5-pro",
   "gpt-5.5-thinking": "gpt-5-5-thinking",
+  "gpt-5.5": "gpt-5-5",
+  "gpt-5.4-pro": "gpt-5-4-pro",
   "gpt-5.4-thinking": "gpt-5-4-thinking",
   "gpt-5.4-thinking-mini": "gpt-5-4-t-mini",
+  "gpt-5.2-pro": "gpt-5-2-pro",
   "gpt-5.2-instant": "gpt-5-2-instant",
   "gpt-5.2": "gpt-5-2",
   "gpt-5.2-thinking": "gpt-5-2-thinking",

tests/unit/chatgpt-web.test.ts

@@ -1119,6 +1119,13 @@ test("Executor MODEL_MAP: dot-form OmniRoute IDs translate to dash-form ChatGPT
       ["gpt-5.4-thinking-mini", "gpt-5-4-t-mini"],
       ["gpt-5.2-thinking", "gpt-5-2-thinking"],
       ["o3", "o3"],
+      // Regression #4665: these advertised catalog ids were missing from
+      // MODEL_MAP and fell through as their dot-form slug verbatim, which the
+      // ChatGPT backend-api silently rejects → served the default Plus model.
+      ["gpt-5.5", "gpt-5-5"],
+      ["gpt-5.5-pro", "gpt-5-5-pro"],
+      ["gpt-5.4-pro", "gpt-5-4-pro"],
+      ["gpt-5.2-pro", "gpt-5-2-pro"],
     ];
     for (const [omniId, expectedSlug] of cases) {
       m.calls.urls.length = 0;
@@ -1141,6 +1148,45 @@ test("Executor MODEL_MAP: dot-form OmniRoute IDs translate to dash-form ChatGPT
   }
 });
 
+test("MODEL_MAP drift guard: every advertised dot-form catalog id resolves to a dash-form backend slug (no verbatim fall-through) (#4665)", async () => {
+  reset();
+  const { getRegistryEntry } = await import("../../open-sse/config/providerRegistry.ts");
+  const ids = (getRegistryEntry("chatgpt-web")?.models || []).map((m) => m.id);
+  // Dot-form ids must never reach the ChatGPT backend verbatim — the backend
+  // only accepts dash-form slugs. (Ids that are already dash-form, e.g.
+  // "gpt-4-5", legitimately pass through unchanged and are exempt.)
+  const dotFormIds = ids.filter((id) => id.includes("."));
+  const m = installMockFetch();
+  try {
+    for (const omniId of dotFormIds) {
+      m.calls.urls.length = 0;
+      m.calls.bodies.length = 0;
+      const executor = new ChatGptWebExecutor();
+      await executor.execute({
+        model: omniId,
+        body: { messages: [{ role: "user", content: "hi" }] },
+        stream: false,
+        credentials: { apiKey: "test" },
+        signal: AbortSignal.timeout(10_000),
+        log: null,
+      });
+      const convIdx = m.calls.urls.findIndex((u) => u.endsWith("/backend-api/f/conversation"));
+      const body = JSON.parse(m.calls.bodies[convIdx]);
+      assert.ok(
+        !body.model.includes("."),
+        `${omniId} reached the backend as "${body.model}" (still dot-form) — missing MODEL_MAP entry causes silent model substitution`,
+      );
+      assert.notEqual(
+        body.model,
+        omniId,
+        `${omniId} fell through MODEL_MAP verbatim — add a dash-form mapping`,
+      );
+    }
+  } finally {
+    m.restore();
+  }
+});
+
 // ─── thinking_effort PATCH user_last_used_model_config ─────────────────────
 
 test("thinking_effort: high → PATCH user_last_used_model_config with extended", async () => {