diff --git a/scripts/test-layout/layout.json b/scripts/test-layout/layout.json
index b1dbc20861f..e41b3eb9a67 100644
--- a/scripts/test-layout/layout.json
+++ b/scripts/test-layout/layout.json
@@ -314,6 +314,7 @@
     "catalog-opencode-go-context-window.test.ts": "codex-integration",
     "catalog-remote-pull.test.ts": "codex-integration",
     "catalog-retain-models.test.ts": "codex-integration",
+    "catalog-routed-comp-hash.test.ts": "codex-integration",
     "catalog-seed-window-fill.test.ts": "codex-integration",
     "catalog-slug-uniqueness-boundary.test.ts": "codex-integration",
     "catalog-verbosity-default.test.ts": "codex-integration",
diff --git a/src/codex/catalog/build-entries.ts b/src/codex/catalog/build-entries.ts
index d138c468282..81bfee3ada0 100644
--- a/src/codex/catalog/build-entries.ts
+++ b/src/codex/catalog/build-entries.ts
@@ -783,6 +783,10 @@ export function mergeCatalogEntriesFromObservedState({
     }
     const slug = String(entry.slug);
     if (!isOcxAuthoredRoutedEntry(entry) || isNativeAliasCatalogEntry(entry)) continue;
+    // The builder no longer copies a template's comp_hash onto routed rows (#5796), but a row
+    // kept from disk may still carry one. Custom rows, Codex-forward aliases included, never
+    // reach this loop: they are rebuilt from config.
+    entry.comp_hash = "opencodex";
     const featuredRank = featuredRankOf(slug);
     entry.priority = featuredRank !== undefined
       ? featuredRank * priorityStride
diff --git a/src/codex/catalog/derive-entry.ts b/src/codex/catalog/derive-entry.ts
index c6b0a9253a5..8058fc6850d 100644
--- a/src/codex/catalog/derive-entry.ts
+++ b/src/codex/catalog/derive-entry.ts
@@ -144,6 +144,11 @@ export function deriveEntry(
         delete e.context_window;
         delete e.max_context_window;
         delete e.auto_compact_token_limit;
+        // Nor its comp_hash (#5796). Codex compacts a thread whenever the recorded value
+        // changes, and the template is whichever native row a rebuild found first, so an
+        // inherited value moves with rebuild order. Left unset, normalization gives every
+        // routed row the same "opencodex" marker.
+        delete e.comp_hash;
       }
       if (typeof e.base_instructions === "string") {
         // Proxy-neutral: keep the GPT-5/OpenAI disclaimer but never advertise the opencodex proxy
diff --git a/structure/catalog.md b/structure/catalog.md
index df1aa8747fb..e72549e518f 100644
--- a/structure/catalog.md
+++ b/structure/catalog.md
@@ -58,7 +58,11 @@ provider-wide fallback. Exact model output limits precede the provider default o
   explicitly configured canonical `openai/gpt-daybreak-blue-latest` Codex-forward row from the
   pinned Sol capability metadata while preserving its selector and Daybreak wire identity;
   this never expands the bare/API-key model lists or rewrites the wire model to `gpt-5.6-sol`;
-- clones a native template for routed `provider/model` entries;
+- clones a native template for routed `provider/model` entries without its `comp_hash`, and resets
+  that value on opencodex rows kept from disk while their provider's discovery is degraded, so these
+  rows carry the fixed `"opencodex"` marker instead of whichever native row a rebuild found first;
+  Codex compacts a thread whenever that value changes (#5796). Codex-forward aliases keep their
+  native value and rows written by other tools keep theirs;
 - forces strict Codex catalog fields required by the current parser;
 - hides `disabledModels` without blocking direct routing (routed provider ids are excluded;
   account-qualified native ids hide only that selector row; BARE native slugs hide the bare row
diff --git a/tests/codex-integration/catalog-routed-comp-hash.test.ts b/tests/codex-integration/catalog-routed-comp-hash.test.ts
new file mode 100644
index 00000000000..d32a22bedeb
--- /dev/null
+++ b/tests/codex-integration/catalog-routed-comp-hash.test.ts
@@ -0,0 +1,69 @@
+import { describe, expect, test } from "bun:test";
+import { buildCatalogEntries } from "../../src/codex/catalog";
+import {
+  buildCatalogEntriesFromObservedState,
+  CANONICAL_NATIVE_CATALOG_CONTENT_POLICY,
+  mergeCatalogEntriesFromObservedState,
+} from "../../src/codex/catalog/sync";
+import type { RawEntry } from "../../src/codex/catalog/parsing";
+
+/**
+ * A routed row is cloned from whichever native row a rebuild picks as the template, and it
+ * used to keep that row's `comp_hash` (#5796). Codex compacts a thread when consecutive turns
+ * record different values, so a rebuild that picked another template compacted every active
+ * routed thread.
+ */
+describe("catalog routed comp_hash (#5796)", () => {
+  const routedHash = (compHash: string | undefined) => buildCatalogEntries(
+    {
+      slug: "gpt-5.5",
+      display_name: "gpt-5.5",
+      description: "Native GPT model",
+      priority: 1,
+      visibility: "list",
+      base_instructions: "You are Codex, a coding agent based on GPT-5.",
+      ...(compHash === undefined ? {} : { comp_hash: compHash }),
+    },
+    [],
+    [{ provider: "local", id: "qwen3-coder" }],
+  ).find(e => e.slug === "local/qwen3-coder")?.comp_hash;
+
+  test("routed rows keep one value whichever native row is the template", () => {
+    expect(routedHash("3000")).toBe("opencodex");
+    expect(routedHash("2911")).toBe("opencodex");
+    expect(routedHash(undefined)).toBe("opencodex");
+  });
+
+  test("a row kept from disk during a provider outage drops a copied value", () => {
+    const merge = (catalogModels: readonly RawEntry[], routedEntries: readonly RawEntry[], degraded: boolean) =>
+      mergeCatalogEntriesFromObservedState({
+        catalogModels, routedEntries, baselineCatalogModels: [], baseline: new Map(), featured: [],
+        wsEnabled: false, template: null, disabledModels: new Set(), selectedModelsByProvider: new Map(),
+        gatheredProviderNames: new Set(["local"]),
+        degradedProviderNames: new Set(degraded ? ["local"] : []),
+        legacyCustomModelSlugs: new Set(), multiAgentMode: "default", multiAgentV2Enabled: false,
+        exactComboSlugs: new Set(), hasPhysicalComboProvider: false, includeNativeOpenAi: true,
+        accountBoundEntries: [],
+        policy: { ...CANONICAL_NATIVE_CATALOG_CONTENT_POLICY, warningPolicy: "suppress" },
+      });
+    const fresh = buildCatalogEntriesFromObservedState({
+      template: null, gptSlugs: [], goModels: [{ provider: "local", id: "qwen3-coder" }],
+      featured: [], modelPickerOrder: [], wsEnabled: false, multiAgentMode: "default",
+      exactComboSlugs: new Set(), accountSelectors: [], suppressedBareNativeSlugs: new Set(),
+      disabledNativeAccountSlugs: new Set(), multiAgentV2Enabled: false,
+    });
+    // A catalog written before the fix, where the routed row still carries a template's value,
+    // plus a row another tool wrote under the same provider. That one is not ours to change.
+    const saved = merge([], fresh, false).map(entry =>
+      entry.slug === "local/qwen3-coder" ? { ...entry, comp_hash: "3000" } : entry);
+    const foreign = {
+      ...saved.find(entry => entry.slug === "local/qwen3-coder")!,
+      slug: "local/imported",
+      description: "Imported model",
+    };
+    const kept = merge([...saved, foreign], [], true);
+    const hash = (slug: string) => kept.find(entry => entry.slug === slug)?.comp_hash;
+    expect(hash("local/qwen3-coder")).toBe("opencodex");
+    expect(hash("local/imported")).toBe("3000");
+  });
+});
diff --git a/tests/fixtures/test-layout-expected.json b/tests/fixtures/test-layout-expected.json
index 10b04d90c0c..9aaa613cf30 100644
--- a/tests/fixtures/test-layout-expected.json
+++ b/tests/fixtures/test-layout-expected.json
@@ -140,6 +140,7 @@
   "catalog-opencode-go-context-window.test.ts": "codex-integration",
   "catalog-remote-pull.test.ts": "codex-integration",
   "catalog-retain-models.test.ts": "codex-integration",
+  "catalog-routed-comp-hash.test.ts": "codex-integration",
   "catalog-seed-window-fill.test.ts": "codex-integration",
   "catalog-slug-uniqueness-boundary.test.ts": "codex-integration",
   "catalog-verbosity-default.test.ts": "codex-integration",