diff --git a/changelog.d/fixes/7662-combos-auto-enumerate-all-variants.md b/changelog.d/fixes/7662-combos-auto-enumerate-all-variants.md
new file mode 100644
index 0000000000..8bfb299c77
--- /dev/null
+++ b/changelog.d/fixes/7662-combos-auto-enumerate-all-variants.md
@@ -0,0 +1 @@
+- GET /api/combos/auto now enumerates template variants (auto/best-coding, auto/pro-_, auto/claude-_, auto/best-free) and family variants (auto/glm, auto/llama, auto/gemini, etc.) in addition to the flat and suffix variants it already exposed. Previously these 27 variants were advertised by /v1/models but missing from the combos endpoint, causing 404s when clients tried to use them.
diff --git a/src/app/api/combos/auto/route.ts b/src/app/api/combos/auto/route.ts
index 7c282dd046..8c35205af3 100644
--- a/src/app/api/combos/auto/route.ts
+++ b/src/app/api/combos/auto/route.ts
@@ -4,6 +4,12 @@ import {
   VALID_VARIANTS,
   type AutoVariant,
 } from "@omniroute/open-sse/services/autoCombo/autoPrefix";
+import {
+  AUTO_SUFFIX_VARIANTS,
+  AUTO_TEMPLATE_VARIANTS,
+  AUTO_FAMILY_IDS,
+} from "@omniroute/open-sse/services/autoCombo/builtinCatalog";
+import { parseAutoSuffix } from "@omniroute/open-sse/services/autoCombo/suffixComposition";
 
 const ALL_VARIANTS: Array<{ variant: AutoVariant | undefined; name: string }> = [
   { variant: undefined, name: "Auto" },
@@ -23,11 +29,14 @@ export async function GET(request: Request) {
       await import("@omniroute/open-sse/services/autoCombo/virtualFactory");
 
     const combos = [];
+    const seenIds = new Set<string>();
     for (const { variant, name } of ALL_VARIANTS) {
       try {
         const virtual = await createVirtualAutoCombo(variant);
+        const id = variant ? `auto/${variant}` : "auto";
+        seenIds.add(id);
         combos.push({
-          id: variant ? `auto/${variant}` : "auto",
+          id,
           name,
           variant: variant ?? null,
           type: "auto",
@@ -36,8 +45,12 @@ export async function GET(request: Request) {
           candidateCount: virtual.candidatePool?.length ?? 0,
           // MAX of candidates' windows — consumers (opencode plugin) need a
           // real value here: advertising 0 disables client auto-compaction.
-          context_length: virtual.advertisedContextLength ?? null,
-          max_output_tokens: virtual.advertisedMaxOutputTokens ?? null,
+          // #7662: mirror catalog.ts's established fallback (advertisedMaxOutputTokens
+          // has no generic default in computeAdvertisedLimits() the way context length
+          // does — an all-unregistered candidate pool, e.g. a no-auth provider's model,
+          // otherwise advertises null and disables client auto-compaction).
+          context_length: virtual.advertisedContextLength || 128000,
+          max_output_tokens: virtual.advertisedMaxOutputTokens || 8192,
           config: virtual.config ?? {},
         });
       } catch {
@@ -45,6 +58,124 @@ export async function GET(request: Request) {
       }
     }
 
+    // Phase B: enumerate template variants (auto/best-coding, auto/pro-*,
+    // auto/claude-*, auto/best-free, etc.) that the backend already supports
+    // via builtinCatalog.ts but were not exposed by this endpoint.
+    // Run BEFORE suffix variants so template resolution wins for overlapping
+    // ids (auto/reasoning, auto/vision), matching catalog.ts behavior.
+    for (const modelStr of Object.keys(AUTO_TEMPLATE_VARIANTS)) {
+      if (seenIds.has(modelStr)) continue;
+      try {
+        const variant = AUTO_TEMPLATE_VARIANTS[modelStr];
+        const spec = modelStr === "auto/best-free" ? { tier: "free" as const } : undefined;
+        const virtual = await createVirtualAutoCombo(variant, spec);
+
+        const displayName = variant
+          ? `Auto ${variant.charAt(0).toUpperCase() + variant.slice(1)}`
+          : "Auto Chat";
+
+        combos.push({
+          id: modelStr,
+          name: displayName,
+          variant: null,
+          type: "auto",
+          isHidden: false,
+          candidatePool: virtual.candidatePool ?? [],
+          candidateCount: virtual.candidatePool?.length ?? 0,
+          // #7662: mirror catalog.ts's established fallback (advertisedMaxOutputTokens
+          // has no generic default in computeAdvertisedLimits() the way context length
+          // does — an all-unregistered candidate pool, e.g. a no-auth provider's model,
+          // otherwise advertises null and disables client auto-compaction).
+          context_length: virtual.advertisedContextLength || 128000,
+          max_output_tokens: virtual.advertisedMaxOutputTokens || 8192,
+          config: virtual.config ?? {},
+        });
+        seenIds.add(modelStr);
+      } catch {
+        // Individual variant failure — skip, don't break the whole list
+      }
+    }
+
+    // Phase C: enumerate tiered `auto/<category>[:<tier>]` variants
+    // (e.g. auto/coding:free, auto/reasoning:pro) that the backend already
+    // supports via suffixComposition.ts + virtualFactory.ts but were not
+    // exposed by this endpoint.
+    for (const modelStr of AUTO_SUFFIX_VARIANTS) {
+      if (seenIds.has(modelStr)) continue;
+      try {
+        const suffix = modelStr.slice("auto/".length);
+        const parsed = parseAutoSuffix(suffix);
+        if (!parsed.valid) continue;
+
+        const virtual = await createVirtualAutoCombo(undefined, {
+          category: parsed.category,
+          tier: parsed.tier,
+        });
+
+        // Build a human-readable name from the category and tier
+        const catName = parsed.category
+          ? parsed.category.charAt(0).toUpperCase() + parsed.category.slice(1)
+          : "";
+        const tierName = parsed.tier
+          ? `${parsed.tier.charAt(0).toUpperCase() + parsed.tier.slice(1)}`
+          : "";
+        const displayName = tierName ? `${catName} ${tierName}` : catName;
+
+        combos.push({
+          id: modelStr,
+          name: `Auto ${displayName}`,
+          variant: null,
+          type: "auto",
+          isHidden: false,
+          candidatePool: virtual.candidatePool ?? [],
+          candidateCount: virtual.candidatePool?.length ?? 0,
+          // #7662: mirror catalog.ts's established fallback (advertisedMaxOutputTokens
+          // has no generic default in computeAdvertisedLimits() the way context length
+          // does — an all-unregistered candidate pool, e.g. a no-auth provider's model,
+          // otherwise advertises null and disables client auto-compaction).
+          context_length: virtual.advertisedContextLength || 128000,
+          max_output_tokens: virtual.advertisedMaxOutputTokens || 8192,
+          config: virtual.config ?? {},
+        });
+        seenIds.add(modelStr);
+      } catch {
+        // Individual variant failure — skip, don't break the whole list
+      }
+    }
+
+    // Phase D: enumerate family variants (auto/glm, auto/llama,
+    // auto/gemini, etc.) that the backend already supports via modelFamily.ts
+    // but were not exposed by this endpoint.
+    for (const modelStr of AUTO_FAMILY_IDS) {
+      if (seenIds.has(modelStr)) continue;
+      try {
+        const suffix = modelStr.slice("auto/".length);
+        const virtual = await createVirtualAutoCombo(undefined, { family: suffix });
+
+        const displayName = `Auto ${suffix.charAt(0).toUpperCase() + suffix.slice(1)}`;
+
+        combos.push({
+          id: modelStr,
+          name: displayName,
+          variant: null,
+          type: "auto",
+          isHidden: false,
+          candidatePool: virtual.candidatePool ?? [],
+          candidateCount: virtual.candidatePool?.length ?? 0,
+          // #7662: mirror catalog.ts's established fallback (advertisedMaxOutputTokens
+          // has no generic default in computeAdvertisedLimits() the way context length
+          // does — an all-unregistered candidate pool, e.g. a no-auth provider's model,
+          // otherwise advertises null and disables client auto-compaction).
+          context_length: virtual.advertisedContextLength || 128000,
+          max_output_tokens: virtual.advertisedMaxOutputTokens || 8192,
+          config: virtual.config ?? {},
+        });
+        seenIds.add(modelStr);
+      } catch {
+        // Individual variant failure — skip, don't break the whole list
+      }
+    }
+
     return NextResponse.json({ combos });
   } catch (error) {
     console.error("Error fetching auto combos:", error);