feat(providers): add max thinking level for gpt-5.6-sol (#2500)

Expose max in the Codex thinking dropdown for gpt-5.6-sol only (maps to
xhigh on wire; live probe rejected ultra). Include custom/kilo models
when computing provider thinking options so manually added gpt-5.6-sol
contributes its max level.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/providers/thinkingLevels.js

@@ -32,6 +32,8 @@ const FORMAT_LEVELS = {
 
 // Model-name pattern overrides (glob, first match wins) — more precise than format default.
 const PATTERN_THINKING = [
+  // gpt-5.6-sol accepts max (maps to xhigh on wire); live probe rejected ultra.
+  { pattern: "*gpt-5.6-sol*", levels: ["none", "minimal", "low", "medium", "high", "xhigh", "max"] },
   { pattern: "*codex*", levels: ["low", "medium", "high", "xhigh"] }, // codex cannot disable thinking
 ];
 

src/app/(dashboard)/dashboard/providers/[id]/page.js

@@ -156,17 +156,27 @@ export default function ProviderDetailPage() {
     const levels = getThinkingLevels(providerId, modelId);
     return levels && levels.includes(thinkingMode) ? thinkingMode : null;
   };
+  const providerStorageAlias = isCompatible ? providerId : providerAlias;
   // Union of levels across this provider's reasoning models — drives the level picker options.
+  // Include custom models too (e.g. manually added gpt-5.6-sol → max).
   const providerThinkingLevels = (() => {
     const set = new Set();
-    for (const m of models) {
+    const seen = new Set();
-      const lv = getThinkingLevels(providerId, m.id);
+    const addLevels = (modelId) => {
+      if (!modelId || seen.has(modelId)) return;
+      seen.add(modelId);
+      const lv = getThinkingLevels(providerId, modelId);
       if (lv) lv.forEach((l) => { if (l !== "none") set.add(l); });
+    };
+    for (const m of models) addLevels(m.id);
+    for (const m of kiloFreeModels) addLevels(m.id);
+    for (const entry of customModels) {
+      if (entry.providerAlias !== providerStorageAlias) continue;
+      if ((entry.kind || entry.type || "llm") !== "llm") continue;
+      addLevels(entry.id);
     }
     return set.size ? ["auto", ...[...set]] : null;
   })();
-  
-  const providerStorageAlias = isCompatible ? providerId : providerAlias;
   const providerDisplayAlias = isCompatible
     ? (providerNode?.prefix || providerId)
     : providerAlias;

tests/unit/thinking-levels-gpt56-sol.test.js

@@ -0,0 +1,21 @@
+import { describe, it, expect } from "vitest";
+import { getThinkingLevels } from "../../open-sse/providers/thinkingLevels.js";
+
+describe("getThinkingLevels", () => {
+  it("adds max for gpt-5.6-sol on codex", () => {
+    const levels = getThinkingLevels("codex", "gpt-5.6-sol");
+    expect(levels).toContain("max");
+    expect(levels).toContain("xhigh");
+    expect(levels).not.toContain("ultra");
+  });
+
+  it("does not add max for other codex models", () => {
+    const levels = getThinkingLevels("codex", "gpt-5.3-codex");
+    expect(levels).toEqual(["low", "medium", "high", "xhigh"]);
+  });
+
+  it("does not add max for other gpt-5.6 models", () => {
+    const levels = getThinkingLevels("codex", "gpt-5.5");
+    expect(levels || []).not.toContain("max");
+  });
+});