diff --git a/open-sse/config/providerModels.ts b/open-sse/config/providerModels.ts
index 99a42ea019f7..6351ad72634a 100644
--- a/open-sse/config/providerModels.ts
+++ b/open-sse/config/providerModels.ts
@@ -61,6 +61,7 @@ export function getModelsByProviderId(providerId: string): RegistryModel[] {
 
 const CLAUDE_MODEL_PATTERN = /(?:^|[\/._-])claude(?:[._-]|$)/;
 const CLAUDE_MAX_EFFORT_UNSUPPORTED_FAMILY_PATTERNS = [/(?:^|[\/._-])haiku(?:[._-]|$)/] as const;
+const ANTHROPIC_COMPATIBLE_PREFIX = "anthropic-compatible-";
 
 export function supportsClaudeMaxEffort(modelId: string | null | undefined): boolean {
   if (typeof modelId !== "string" || modelId.length === 0) return false;
@@ -73,19 +74,37 @@ export function supportsClaudeMaxEffort(modelId: string | null | undefined): boo
   );
 }
 
+function resolveProviderModelList(aliasOrId: string): {
+  alias: string;
+  models: RegistryModel[] | null;
+} {
+  const resolvedId = aliasOrId.startsWith(ANTHROPIC_COMPATIBLE_PREFIX) ? "claude" : aliasOrId;
+  const alias = PROVIDER_ID_TO_ALIAS[resolvedId] || resolvedId;
+  const models = PROVIDER_MODELS[alias] || PROVIDER_MODELS[resolvedId] || null;
+  return { alias, models };
+}
+
 export function supportsXHighEffort(aliasOrId: string, modelId: string): boolean {
-  const alias = PROVIDER_ID_TO_ALIAS[aliasOrId] || aliasOrId;
-  const providerModels = PROVIDER_MODELS[alias] || PROVIDER_MODELS[aliasOrId];
+  const { models: providerModels } = resolveProviderModelList(aliasOrId);
   // Unknown provider (not in registry) — pass through unchanged.
   if (!providerModels) return true;
-  const model = getProviderModel(alias, modelId);
+  const model = providerModels.find((entry) => entry.id === modelId);
+
+  // Keep explicit false entries as the unsupported-model list. Unlisted models
+  // and models without an explicit flag pass through unchanged.
+  return model?.supportsXHighEffort !== false;
+}
+
+export function supportsXHighEffortForMaxNormalization(
+  aliasOrId: string,
+  modelId: string
+): boolean {
+  const { alias, models: providerModels } = resolveProviderModelList(aliasOrId);
+  if (!providerModels) return true;
+  const model = providerModels.find((entry) => entry.id === modelId);
 
-  // Claude Code models default to supporting extra-high effort. Keep explicit
-  // false entries as the unsupported-model list so newly added Claude models do
-  // not need opt-in flags.
   if (alias === "cc") {
     return model?.supportsXHighEffort !== false;
   }
-
   return model?.supportsXHighEffort === true;
 }
diff --git a/open-sse/executors/base.ts b/open-sse/executors/base.ts
index f940e630d6c8..2da49931ff74 100644
--- a/open-sse/executors/base.ts
+++ b/open-sse/executors/base.ts
@@ -1,6 +1,10 @@
 import { HTTP_STATUS, FETCH_TIMEOUT_MS } from "../config/constants.ts";
 import { applyFingerprint, isCliCompatEnabled } from "../config/cliFingerprints.ts";
-import { supportsClaudeMaxEffort, supportsXHighEffort } from "../config/providerModels.ts";
+import {
+  supportsClaudeMaxEffort,
+  supportsXHighEffort,
+  supportsXHighEffortForMaxNormalization,
+} from "../config/providerModels.ts";
 import type { PoolConfig } from "../services/sessionPool/types.ts";
 import type { Session } from "../services/sessionPool/session.ts";
 import { SessionPool } from "../services/sessionPool/sessionPool.ts";
@@ -25,7 +29,10 @@ import {
   modelSupportsContext1mBeta,
 } from "../services/claudeCodeCompatible.ts";
 import { getClaudeCodeCompatibleRequestDefaults } from "@/lib/providers/requestDefaults";
-import { cloakThirdPartyToolNames, remapToolNamesInRequest } from "../services/claudeCodeToolRemapper.ts";
+import {
+  cloakThirdPartyToolNames,
+  remapToolNamesInRequest,
+} from "../services/claudeCodeToolRemapper.ts";
 import { obfuscateInBody } from "../services/claudeCodeObfuscation.ts";
 import { sanitizeClaudeToolSchemas } from "../translator/helpers/schemaCoercion.ts";
 import { sanitizeResponsesInputItems } from "../services/responsesInputSanitizer.ts";
@@ -223,12 +230,11 @@ function hasActiveClaudeThinking(body: Record<string, unknown>): boolean {
  * Each rejection burns a combo fallback attempt before reaching a working
  * provider. Apply provider-aware sanitation here (after transformRequest, so
  * reintroductions by per-provider transforms are also caught) before fetch.
- * xhigh support is registry-gated: models that genuinely support xhigh pass
- * through unchanged, and Claude models default to xhigh support unless marked
- * as legacy unsupported entries. max support is Claude/CC-compatible only and
+ * xhigh support is opt-out: pass through unchanged unless the registry marks
+ * a model as unsupported. max support is Claude/CC-compatible only and
  * intentionally separate: older Opus/Sonnet models may support max even when
- * they do not support xhigh. For OpenAI-shape providers, normalize max to
- * xhigh when that top tier is allowed; otherwise downgrade to high.
+ * they do not support xhigh. For OpenAI-shape providers, keep the existing
+ * max normalization behavior.
  */
 const MISTRAL_NO_REASONING_EFFORT_PATTERN = /devstral/i;
 const GITHUB_NO_REASONING_EFFORT_PATTERN = /(claude|haiku|oswe)/i;
@@ -260,10 +266,10 @@ export function sanitizeReasoningEffortForProvider(
 
   const supportsXHigh = supportsXHighEffort(provider, modelStr);
   const shouldDowngradeXHigh = effortStr === "xhigh" && !supportsXHigh;
-  const shouldNormalizeMaxToXHigh =
-    effortStr === "max" && !supportsMaxEffortForProvider(provider, modelStr) && supportsXHigh;
-  const shouldDowngradeMax =
-    effortStr === "max" && !supportsMaxEffortForProvider(provider, modelStr) && !supportsXHigh;
+  const supportsXHighForMax = supportsXHighEffortForMaxNormalization(provider, modelStr);
+  const supportsMax = supportsMaxEffortForProvider(provider, modelStr);
+  const shouldNormalizeMaxToXHigh = effortStr === "max" && !supportsMax && supportsXHighForMax;
+  const shouldDowngradeMax = effortStr === "max" && !supportsMax && !supportsXHighForMax;
 
   if (shouldNormalizeMaxToXHigh) {
     log?.info?.(
diff --git a/package-lock.json b/package-lock.json
index 25c8f8dfc6ca..3b293886a84c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -93,7 +93,7 @@
         "@testing-library/react": "^16.3.2",
         "@types/bcryptjs": "^3.0.0",
         "@types/better-sqlite3": "^7.6.13",
-        "@types/bun": "latest",
+        "@types/bun": "*",
         "@types/keytar": "^4.4.2",
         "@types/node": "^25.9.1",
         "@types/react": "^19.2.15",
@@ -1351,9 +1351,9 @@
       "license": "MIT"
     },
     "node_modules/@esbuild/aix-ppc64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.28.0.tgz",
-      "integrity": "sha512-lhRUCeuOyJQURhTxl4WkpFTjIsbDayJHih5kZC1giwE+MhIzAb7mEsQMqMf18rHLsrb5qI1tafG20mLxEWcWlA==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.28.1.tgz",
+      "integrity": "sha512-Svl7tq8k/08+p6CXPpRjQ1fKX+1odH/BQbb48fV6fj3CWHhsoIOoY87w1oHXm0qEpkIK3ZfVgp0hed3XBXzXMQ==",
       "cpu": [
         "ppc64"
       ],
@@ -1367,9 +1367,9 @@
       }
     },
     "node_modules/@esbuild/android-arm": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.28.0.tgz",
-      "integrity": "sha512-wqh0ByljabXLKHeWXYLqoJ5jKC4XBaw6Hk08OfMrCRd2nP2ZQ5eleDZC41XHyCNgktBGYMbqnrJKq/K/lzPMSQ==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.28.1.tgz",
+      "integrity": "sha512-0k2F129Xdio1TdJfzJ8sy1Q47vUD2NnwdhiAf7drUN1EBTfPf4hsFCtmMgu/6m8JSzsBrlmVjudMBQqOfG8usQ==",
       "cpu": [
         "arm"
       ],
@@ -1383,9 +1383,9 @@
       }
     },
     "node_modules/@esbuild/android-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.28.0.tgz",
-      "integrity": "sha512-+WzIXQOSaGs33tLEgYPYe/yQHf0WTU0X42Jca3y8NWMbUVhp7rUnw+vAsRC/QiDrdD31IszMrZy+qwPOPjd+rw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.28.1.tgz",
+      "integrity": "sha512-34EGEbCIAgosYz6goLcopX6Mo7NyGv9tfwEM2/7Ce2VcVRk568iSvniGWcUXIy7wEDR1wzolcxcriFVrWYcwBg==",
       "cpu": [
         "arm64"
       ],
@@ -1399,9 +1399,9 @@
       }
     },
     "node_modules/@esbuild/android-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.28.0.tgz",
-      "integrity": "sha512-+VJggoaKhk2VNNqVL7f6S189UzShHC/mR9EE8rDdSkdpN0KflSwWY/gWjDrNxxisg8Fp1ZCD9jLMo4m0OUfeUA==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.28.1.tgz",
+      "integrity": "sha512-dbwY7ltSMDWsRatcRpCnES4F+im88OCUgGZjy52shC7GqHRE/cYlxNbB4Z4UpJswpcc4Qxd2oE/ufM0p61IKng==",
       "cpu": [
         "x64"
       ],
@@ -1415,9 +1415,9 @@
       }
     },
     "node_modules/@esbuild/darwin-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.28.0.tgz",
-      "integrity": "sha512-0T+A9WZm+bZ84nZBtk1ckYsOvyA3x7e2Acj1KdVfV4/2tdG4fzUp91YHx+GArWLtwqp77pBXVCPn2We7Letr0Q==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.28.1.tgz",
+      "integrity": "sha512-TZbWkQY7kvTAXbXUT7uVACR5cMHsDiSz9z7ZKAX/RTq/WJEk3QyRr0wZpNhBDX+/0CtdqUIJlOiodQcta6tY3Q==",
       "cpu": [
         "arm64"
       ],
@@ -1431,9 +1431,9 @@
       }
     },
     "node_modules/@esbuild/darwin-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.28.0.tgz",
-      "integrity": "sha512-fyzLm/DLDl/84OCfp2f/XQ4flmORsjU7VKt8HLjvIXChJoFFOIL6pLJPH4Yhd1n1gGFF9mPwtlN5Wf82DZs+LQ==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.28.1.tgz",
+      "integrity": "sha512-zfdzgK9ACBNZLI/CyHTOx81SyNbM6YXn7rxSgX97VjyiPl9W1i4Ka4fgKECEoFCKGpvBj5qArWIGgQjOwkgskQ==",
       "cpu": [
         "x64"
       ],
@@ -1447,9 +1447,9 @@
       }
     },
     "node_modules/@esbuild/freebsd-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.28.0.tgz",
-      "integrity": "sha512-l9GeW5UZBT9k9brBYI+0WDffcRxgHQD8ShN2Ur4xWq/NFzUKm3k5lsH4PdaRgb2w7mI9u61nr2gI2mLI27Nh3Q==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.28.1.tgz",
+      "integrity": "sha512-wG2EA8ENdEI0qhkSZMjfqrdY+ziCYCPMmtZjjIwOmXFjmyzEHn+UUxk5of+SYsjtfs3VpnlC7QLzSI5hY/rOAw==",
       "cpu": [
         "arm64"
       ],
@@ -1463,9 +1463,9 @@
       }
     },
     "node_modules/@esbuild/freebsd-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.28.0.tgz",
-      "integrity": "sha512-BXoQai/A0wPO6Es3yFJ7APCiKGc1tdAEOgeTNy3SsB491S3aHn4S4r3e976eUnPdU+NbdtmBuLncYir2tMU9Nw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.28.1.tgz",
+      "integrity": "sha512-i7dZ9vQgnvSCzi/rYCXNgtF/U+eKZNJBzu3eTQbRgHnM7tNSizLOkRFAl3qzVc/Op/u5YkHHa4pf/3DOYHthLQ==",
       "cpu": [
         "x64"
       ],
@@ -1479,9 +1479,9 @@
       }
     },
     "node_modules/@esbuild/linux-arm": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.28.0.tgz",
-      "integrity": "sha512-CjaaREJagqJp7iTaNQjjidaNbCKYcd4IDkzbwwxtSvjI7NZm79qiHc8HqciMddQ6CKvJT6aBd8lO9kN/ZudLlw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.28.1.tgz",
+      "integrity": "sha512-qVXBOHQS+d5Y722GwJzJUtOLlX7km3CraOaGormF1pDtPd2C/l1SHRPgjLunLGe51Sh5YYWKMFDyV4SxgMQYTQ==",
       "cpu": [
         "arm"
       ],
@@ -1495,9 +1495,9 @@
       }
     },
     "node_modules/@esbuild/linux-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.28.0.tgz",
-      "integrity": "sha512-RVyzfb3FWsGA55n6WY0MEIEPURL1FcbhFE6BffZEMEekfCzCIMtB5yyDcFnVbTnwk+CLAgTujmV/Lgvih56W+A==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.28.1.tgz",
+      "integrity": "sha512-yHs+0uc8+nvEAfAfxrWQKK5peSNzBc4PegcMO0EJ2hT71uA7vB8Ihg2e77R2P7SG5uYjPbHlLLmve4LLLRCf0g==",
       "cpu": [
         "arm64"
       ],
@@ -1511,9 +1511,9 @@
       }
     },
     "node_modules/@esbuild/linux-ia32": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.28.0.tgz",
-      "integrity": "sha512-KBnSTt1kxl9x70q+ydterVdl+Cn0H18ngRMRCEQfrbqdUuntQQ0LoMZv47uB97NljZFzY6HcfqEZ2SAyIUTQBQ==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.28.1.tgz",
+      "integrity": "sha512-d1z4ZuP0ajrfz/FhGT4vv278rX8KnPPJx8i5+AtK7TYbx9Le9F1hyzurZpkEyjkGa9dUGhQow4C1NmeGvqxN2w==",
       "cpu": [
         "ia32"
       ],
@@ -1527,9 +1527,9 @@
       }
     },
     "node_modules/@esbuild/linux-loong64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.28.0.tgz",
-      "integrity": "sha512-zpSlUce1mnxzgBADvxKXX5sl8aYQHo2ezvMNI8I0lbblJtp8V4odlm3Yzlj7gPyt3T8ReksE6bK+pT3WD+aJRg==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.28.1.tgz",
+      "integrity": "sha512-M5sRjUVZrkm1OAPR3dlOYzNmN+loZKGVi1VUQGrwuqLcbR6qeAz+famMhjASeH3YVKvZz+zT1jlh/keC3Rj/lg==",
       "cpu": [
         "loong64"
       ],
@@ -1543,9 +1543,9 @@
       }
     },
     "node_modules/@esbuild/linux-mips64el": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.28.0.tgz",
-      "integrity": "sha512-2jIfP6mmjkdmeTlsX/9vmdmhBmKADrWqN7zcdtHIeNSCH1SqIoNI63cYsjQR8J+wGa4Y5izRcSHSm8K3QWmk3w==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.28.1.tgz",
+      "integrity": "sha512-mRObBZeHh2OxcBFPWE/FjylkRgZdYuiTR3vaTozquCGOH14iP9oN4x4Ge81CoIDYQrXmIxpFumJBu5MtZpnQJQ==",
       "cpu": [
         "mips64el"
       ],
@@ -1559,9 +1559,9 @@
       }
     },
     "node_modules/@esbuild/linux-ppc64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.28.0.tgz",
-      "integrity": "sha512-bc0FE9wWeC0WBm49IQMPSPILRocGTQt3j5KPCA8os6VprfuJ7KD+5PzESSrJ6GmPIPJK965ZJHTUlSA6GNYEhg==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.28.1.tgz",
+      "integrity": "sha512-slScBsMAb3GFDcdrCgLwZtPYRoH2H/youv10QiZyRjmsP48fznoveWytSgCI/R0ZcUgpc0ZhIUEx6LHts8yrfQ==",
       "cpu": [
         "ppc64"
       ],
@@ -1575,9 +1575,9 @@
       }
     },
     "node_modules/@esbuild/linux-riscv64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.28.0.tgz",
-      "integrity": "sha512-SQPZOwoTTT/HXFXQJG/vBX8sOFagGqvZyXcgLA3NhIqcBv1BJU1d46c0rGcrij2B56Z2rNiSLaZOYW5cUk7yLQ==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.28.1.tgz",
+      "integrity": "sha512-kw0owk1o0GFETUJyW0jc0G4Yzs0BHZn0JDZ8JRT088vjJYX777BAs1fDGxAC+q831qOs2DTC96mNsG2opdfyyQ==",
       "cpu": [
         "riscv64"
       ],
@@ -1591,9 +1591,9 @@
       }
     },
     "node_modules/@esbuild/linux-s390x": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.28.0.tgz",
-      "integrity": "sha512-SCfR0HN8CEEjnYnySJTd2cw0k9OHB/YFzt5zgJEwa+wL/T/raGWYMBqwDNAC6dqFKmJYZoQBRfHjgwLHGSrn3Q==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.28.1.tgz",
+      "integrity": "sha512-/lAIjX8aYFRByhh6L5rYtPEDRqa9de/4V/juOXcta5frjvzXO4/sqEtyytse0g3zZFuWu5cDN0MkLz2qRDD2Ag==",
       "cpu": [
         "s390x"
       ],
@@ -1607,9 +1607,9 @@
       }
     },
     "node_modules/@esbuild/linux-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.28.0.tgz",
-      "integrity": "sha512-us0dSb9iFxIi8srnpl931Nvs65it/Jd2a2K3qs7fz2WfGPHqzfzZTfec7oxZJRNPXPnNYZtanmRc4AL/JwVzHQ==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.28.1.tgz",
+      "integrity": "sha512-u/anNYF2mmVOEDwLtnQ1wOr3EZ9sTNGLWrsYGYwHWzGA3Si84IOkHXlbWTD1NB+9/1lcnweYKO54uhxZydNzfA==",
       "cpu": [
         "x64"
       ],
@@ -1623,9 +1623,9 @@
       }
     },
     "node_modules/@esbuild/netbsd-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.28.0.tgz",
-      "integrity": "sha512-CR/RYotgtCKwtftMwJlUU7xCVNg3lMYZ0RzTmAHSfLCXw3NtZtNpswLEj/Kkf6kEL3Gw+BpOekRX0BYCtklhUw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.28.1.tgz",
+      "integrity": "sha512-oks0DYbLwWMmaakTsCb+zL4E+aHRVLom9IJZOAthMQEPiQmydXHkziYEsGYRx0uNV/IjEKGAV941JzH02pflqw==",
       "cpu": [
         "arm64"
       ],
@@ -1639,9 +1639,9 @@
       }
     },
     "node_modules/@esbuild/netbsd-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.28.0.tgz",
-      "integrity": "sha512-nU1yhmYutL+fQ71Kxnhg8uEOdC0pwEW9entHykTgEbna2pw2dkbFSMeqjjyHZoCmt8SBkOSvV+yNmm94aUrrqw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-x64/-/netbsd-x64-0.28.1.tgz",
+      "integrity": "sha512-aeL6lAnN89Hz43Mlh1G8ARasbuoYvSITDEx0tHh5b7jJnHcssqgjy9Yx430GDpmCa6OyrKoS0aNRjKundRizGg==",
       "cpu": [
         "x64"
       ],
@@ -1655,9 +1655,9 @@
       }
     },
     "node_modules/@esbuild/openbsd-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.28.0.tgz",
-      "integrity": "sha512-cXb5vApOsRsxsEl4mcZ1XY3D4DzcoMxR/nnc4IyqYs0rTI8ZKmW6kyyg+11Z8yvgMfAEldKzP7AdP64HnSC/6g==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-arm64/-/openbsd-arm64-0.28.1.tgz",
+      "integrity": "sha512-MEFJe5C3R8pwXdZ5Y21oo6m7ePiS0d9pWucn99O/wvyJZChoIQKrQDxKrGeW8F5+T0okTHesAmDeiHDTIq0V/Q==",
       "cpu": [
         "arm64"
       ],
@@ -1671,9 +1671,9 @@
       }
     },
     "node_modules/@esbuild/openbsd-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.28.0.tgz",
-      "integrity": "sha512-8wZM2qqtv9UP3mzy7HiGYNH/zjTA355mpeuA+859TyR+e+Tc08IHYpLJuMsfpDJwoLo1ikIJI8jC3GFjnRClzA==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/openbsd-x64/-/openbsd-x64-0.28.1.tgz",
+      "integrity": "sha512-i/ZLIOafE0Z8cI/XANJAixoJL/uRAoS2xOA3rb0xN+KK0K177cMAsQYkzHtBrtMXAKuAc7HGgcWiZ/sRC1Nxgw==",
       "cpu": [
         "x64"
       ],
@@ -1687,9 +1687,9 @@
       }
     },
     "node_modules/@esbuild/openharmony-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/openharmony-arm64/-/openharmony-arm64-0.28.0.tgz",
-      "integrity": "sha512-FLGfyizszcef5C3YtoyQDACyg95+dndv79i2EekILBofh5wpCa1KuBqOWKrEHZg3zrL3t5ouE5jgr94vA+Wb2w==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/openharmony-arm64/-/openharmony-arm64-0.28.1.tgz",
+      "integrity": "sha512-ge+Z7EXFNt2BO1oAMsVpiQ8EwndV9i1xXerAeTIK7AtPs3bKFXQM7nlRxDSIUIMeueR1CNXxqztLzdNeReKBJg==",
       "cpu": [
         "arm64"
       ],
@@ -1703,9 +1703,9 @@
       }
     },
     "node_modules/@esbuild/sunos-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.28.0.tgz",
-      "integrity": "sha512-1ZgjUoEdHZZl/YlV76TSCz9Hqj9h9YmMGAgAPYd+q4SicWNX3G5GCyx9uhQWSLcbvPW8Ni7lj4gDa1T40akdlw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.28.1.tgz",
+      "integrity": "sha512-BEjgtECkL3vY+SaSQ6nzVfiALUeFxpawyp8Jmf5PtYhf1Ug40N1h/hxlhts+f1FvSvarEigdxS3BlSMI2PJLcQ==",
       "cpu": [
         "x64"
       ],
@@ -1719,9 +1719,9 @@
       }
     },
     "node_modules/@esbuild/win32-arm64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.28.0.tgz",
-      "integrity": "sha512-Q9StnDmQ/enxnpxCCLSg0oo4+34B9TdXpuyPeTedN/6+iXBJ4J+zwfQI28u/Jl40nOYAxGoNi7mFP40RUtkmUA==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.28.1.tgz",
+      "integrity": "sha512-lCv9eK/H6ZJWbE7bh2nw54CZ9M2nupBxJcTsdk/QQnWkdSjKGuxmmH8/GWrlT1eMmZfn4dGcCjRte397WqfQXA==",
       "cpu": [
         "arm64"
       ],
@@ -1735,9 +1735,9 @@
       }
     },
     "node_modules/@esbuild/win32-ia32": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.28.0.tgz",
-      "integrity": "sha512-zF3ag/gfiCe6U2iczcRzSYJKH1DCI+ByzSENHlM2FcDbEeo5Zd2C86Aq0tKUYAJJ1obRP84ymxIAksZUcdztHA==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.28.1.tgz",
+      "integrity": "sha512-zvb/mB2bSCoJOpoCBgYKKpX6YM6mJBlBUVUtVj41DlZJVEB6/0CKlRYxP5wWl1C1ILiCoAU5wZZ4q1P3qeS6Eg==",
       "cpu": [
         "ia32"
       ],
@@ -1751,9 +1751,9 @@
       }
     },
     "node_modules/@esbuild/win32-x64": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.28.0.tgz",
-      "integrity": "sha512-pEl1bO9mfAmIC+tW5btTmrKaujg3zGtUmWNdCw/xs70FBjwAL3o9OEKNHvNmnyylD6ubxUERiEhdsL0xBQ9efw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.28.1.tgz",
+      "integrity": "sha512-bm4Mowrv+GXMlpWX++EcXw/iLyd1o3+bJkC2DkWXYVvgZCqD/bSj9ctZeAMC3cIxgjRVR2Dufaiu4YPxr5gW1A==",
       "cpu": [
         "x64"
       ],
@@ -10317,9 +10317,9 @@
       }
     },
     "node_modules/esbuild": {
-      "version": "0.28.0",
-      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.28.0.tgz",
-      "integrity": "sha512-sNR9MHpXSUV/XB4zmsFKN+QgVG82Cc7+/aaxJ8Adi8hyOac+EXptIp45QBPaVyX3N70664wRbTcLTOemCAnyqw==",
+      "version": "0.28.1",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.28.1.tgz",
+      "integrity": "sha512-HrJrvZv5ayxBzPfwphOoNzkzOIIlifzk0KJrGK2c8R4+LKpMtpYLQeUdjnwjWv/LZlkH2laZk+4w78pi99D4Vw==",
       "hasInstallScript": true,
       "license": "MIT",
       "bin": {
@@ -10329,32 +10329,32 @@
         "node": ">=18"
       },
       "optionalDependencies": {
-        "@esbuild/aix-ppc64": "0.28.0",
-        "@esbuild/android-arm": "0.28.0",
-        "@esbuild/android-arm64": "0.28.0",
-        "@esbuild/android-x64": "0.28.0",
-        "@esbuild/darwin-arm64": "0.28.0",
-        "@esbuild/darwin-x64": "0.28.0",
-        "@esbuild/freebsd-arm64": "0.28.0",
-        "@esbuild/freebsd-x64": "0.28.0",
-        "@esbuild/linux-arm": "0.28.0",
-        "@esbuild/linux-arm64": "0.28.0",
-        "@esbuild/linux-ia32": "0.28.0",
-        "@esbuild/linux-loong64": "0.28.0",
-        "@esbuild/linux-mips64el": "0.28.0",
-        "@esbuild/linux-ppc64": "0.28.0",
-        "@esbuild/linux-riscv64": "0.28.0",
-        "@esbuild/linux-s390x": "0.28.0",
-        "@esbuild/linux-x64": "0.28.0",
-        "@esbuild/netbsd-arm64": "0.28.0",
-        "@esbuild/netbsd-x64": "0.28.0",
-        "@esbuild/openbsd-arm64": "0.28.0",
-        "@esbuild/openbsd-x64": "0.28.0",
-        "@esbuild/openharmony-arm64": "0.28.0",
-        "@esbuild/sunos-x64": "0.28.0",
-        "@esbuild/win32-arm64": "0.28.0",
-        "@esbuild/win32-ia32": "0.28.0",
-        "@esbuild/win32-x64": "0.28.0"
+        "@esbuild/aix-ppc64": "0.28.1",
+        "@esbuild/android-arm": "0.28.1",
+        "@esbuild/android-arm64": "0.28.1",
+        "@esbuild/android-x64": "0.28.1",
+        "@esbuild/darwin-arm64": "0.28.1",
+        "@esbuild/darwin-x64": "0.28.1",
+        "@esbuild/freebsd-arm64": "0.28.1",
+        "@esbuild/freebsd-x64": "0.28.1",
+        "@esbuild/linux-arm": "0.28.1",
+        "@esbuild/linux-arm64": "0.28.1",
+        "@esbuild/linux-ia32": "0.28.1",
+        "@esbuild/linux-loong64": "0.28.1",
+        "@esbuild/linux-mips64el": "0.28.1",
+        "@esbuild/linux-ppc64": "0.28.1",
+        "@esbuild/linux-riscv64": "0.28.1",
+        "@esbuild/linux-s390x": "0.28.1",
+        "@esbuild/linux-x64": "0.28.1",
+        "@esbuild/netbsd-arm64": "0.28.1",
+        "@esbuild/netbsd-x64": "0.28.1",
+        "@esbuild/openbsd-arm64": "0.28.1",
+        "@esbuild/openbsd-x64": "0.28.1",
+        "@esbuild/openharmony-arm64": "0.28.1",
+        "@esbuild/sunos-x64": "0.28.1",
+        "@esbuild/win32-arm64": "0.28.1",
+        "@esbuild/win32-ia32": "0.28.1",
+        "@esbuild/win32-x64": "0.28.1"
       }
     },
     "node_modules/escalade": {
diff --git a/scripts/build/prepublish.ts b/scripts/build/prepublish.ts
index b5c2e14dfba2..afcdca2be355 100644
--- a/scripts/build/prepublish.ts
+++ b/scripts/build/prepublish.ts
@@ -309,6 +309,15 @@ if (existsSync(opencodePluginSrc) && existsSync(join(opencodePluginSrc, "package
   } else {
     console.log("  ✅ @omniroute/opencode-plugin dist/ already present (skipping rebuild)");
   }
+  // Remove plugin node_modules after build — hard links created by npm install on Linux
+  // (CI runner) end up in the tarball as LINK entries, which npm registry rejects with
+  // E415 "Hard link is not allowed". The node_modules are only needed for the tsup build;
+  // they must not ship in the published package.
+  const pluginNodeModules = join(opencodePluginSrc, "node_modules");
+  if (existsSync(pluginNodeModules)) {
+    rmSync(pluginNodeModules, { recursive: true, force: true });
+    console.log("  🧹 Removed @omniroute/opencode-plugin/node_modules (hard link guard)");
+  }
 } else {
   console.log("  ⏭️  @omniroute/opencode-plugin not found in workspace (skipping build)");
 }
diff --git a/tests/unit/base-executor-sanitize-effort.test.ts b/tests/unit/base-executor-sanitize-effort.test.ts
index 9f2eea1266e8..fc909674785d 100644
--- a/tests/unit/base-executor-sanitize-effort.test.ts
+++ b/tests/unit/base-executor-sanitize-effort.test.ts
@@ -11,7 +11,7 @@ function makeLog() {
   };
 }
 
-test("sanitizeReasoningEffortForProvider: xiaomi-mimo downgrades xhigh → high", () => {
+test("sanitizeReasoningEffortForProvider: xiaomi-mimo preserves xhigh by default", () => {
   const log = makeLog();
   const body = {
     model: "mimo-v2.5-pro",
@@ -19,15 +19,60 @@ test("sanitizeReasoningEffortForProvider: xiaomi-mimo downgrades xhigh → high"
     messages: [{ role: "user", content: "hi" }],
   };
   const result = sanitizeReasoningEffortForProvider(body, "xiaomi-mimo", "mimo-v2.5-pro", log);
+  assert.equal(result, body, "xhigh passes through unless the model explicitly opts out");
+  assert.equal((result as any).reasoning_effort, "xhigh");
+  assert.equal((result as any).model, "mimo-v2.5-pro", "other fields preserved");
+  assert.equal(log.messages.length, 0);
+});
+
+test("sanitizeReasoningEffortForProvider: OpenRouter DeepSeek preserves xhigh", () => {
+  const body = {
+    model: "deepseek/deepseek-v4-pro",
+    reasoning_effort: "xhigh",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(
+    body,
+    "openrouter",
+    "deepseek/deepseek-v4-pro",
+    null
+  );
+  assert.equal(result, body);
+  assert.equal((result as any).reasoning_effort, "xhigh");
+});
+
+test("sanitizeReasoningEffortForProvider: explicit xhigh opt-out downgrades to high", () => {
+  const log = makeLog();
+  const body = {
+    model: "claude-opus-4-6",
+    reasoning_effort: "xhigh",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "claude", "claude-opus-4-6", log);
   assert.notEqual(result, body, "must return a new object when mutating");
   assert.equal((result as any).reasoning_effort, "high");
-  assert.equal((result as any).model, "mimo-v2.5-pro", "other fields preserved");
   assert.ok(
     log.messages.some(([tag, m]) => tag === "REASONING_SANITIZE" && /xhigh → high/.test(m)),
     "logs the downgrade"
   );
 });
 
+test("sanitizeReasoningEffortForProvider: Anthropic-compatible dynamic provider honors xhigh opt-out", () => {
+  const body = {
+    model: "claude-opus-4-6",
+    reasoning_effort: "xhigh",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(
+    body,
+    "anthropic-compatible-test",
+    "claude-opus-4-6",
+    null
+  );
+  assert.notEqual(result, body, "must return a new object when mutating");
+  assert.equal((result as any).reasoning_effort, "high");
+});
+
 test("sanitizeReasoningEffortForProvider: xiaomi-mimo downgrades max → high", () => {
   const log = makeLog();
   const body = {
@@ -125,29 +170,25 @@ test("sanitizeReasoningEffortForProvider: claude preserves max for Opus/Sonnet a
   assert.equal((haikuResult as any).reasoning_effort, "high");
 });
 
-test("sanitizeReasoningEffortForProvider: xiaomi-mimo downgrades xhigh in nested reasoning.effort", () => {
+test("sanitizeReasoningEffortForProvider: xiaomi-mimo preserves nested xhigh by default", () => {
   const body = {
     model: "mimo-v2.5-pro",
     reasoning: { effort: "xhigh", summary: "auto" },
     messages: [],
   };
   const result = sanitizeReasoningEffortForProvider(body, "xiaomi-mimo", "mimo-v2.5-pro", null);
-  assert.equal((result as any).reasoning.effort, "high");
+  assert.equal(result, body);
+  assert.equal((result as any).reasoning.effort, "xhigh");
   assert.equal((result as any).reasoning.summary, "auto", "other reasoning fields preserved");
 });
 
-test("sanitizeReasoningEffortForProvider: nested reasoning downgrade preserves Responses shape", () => {
+test("sanitizeReasoningEffortForProvider: explicit xhigh opt-out preserves Responses shape", () => {
   const body = {
-    model: "responses-only-model",
+    model: "claude-opus-4-6",
     reasoning: { effort: "xhigh", summary: "auto" },
     input: [],
   };
-  const result = sanitizeReasoningEffortForProvider(
-    body,
-    "xiaomi-mimo",
-    "responses-only-model",
-    null
-  );
+  const result = sanitizeReasoningEffortForProvider(body, "claude", "claude-opus-4-6", null);
   assert.equal((result as any).reasoning.effort, "high");
   assert.equal((result as any).reasoning_effort, undefined);
 });
@@ -197,22 +238,14 @@ test("sanitizeReasoningEffortForProvider: mistral/devstral preserves reasoning w
   assert.deepEqual((result as any).reasoning, { summary: "auto" });
 });
 
-test("sanitizeReasoningEffortForProvider: codex with xhigh passes through unchanged when model supports it", () => {
-  // codex/gpt-5.5-xhigh is flagged supportsXHighEffort:true in providerRegistry.
-  // Claude Opus 4.7+ models default to xhigh support unless explicitly opted out.
+test("sanitizeReasoningEffortForProvider: codex with xhigh passes through unchanged", () => {
   const body = {
     model: "gpt-5.5-xhigh",
     reasoning_effort: "xhigh",
     messages: [],
   };
   const result = sanitizeReasoningEffortForProvider(body, "codex", "gpt-5.5-xhigh", null);
-  // Either passes through unchanged (supportsXHighEffort=true)
-  // or the registry doesn't flag it — in which case downgrade is acceptable.
-  // We assert no error and that some reasoning_effort is present.
-  assert.ok(
-    (result as any).reasoning_effort === "xhigh" || (result as any).reasoning_effort === "high",
-    "either preserved (xhigh) or downgraded (high)"
-  );
+  assert.equal((result as any).reasoning_effort, "xhigh");
 });
 
 test("sanitizeReasoningEffortForProvider: no-op when reasoning_effort absent", () => {
@@ -224,10 +257,8 @@ test("sanitizeReasoningEffortForProvider: no-op when reasoning_effort absent", (
 test("sanitizeReasoningEffortForProvider: handles unknown providers as pass-through", () => {
   const body = { model: "some-model", reasoning_effort: "xhigh", messages: [] };
   const result = sanitizeReasoningEffortForProvider(body, "unknown-provider", "some-model", null);
-  // unknown provider + xhigh + model not in registry → supportsXHighEffort returns false → downgrade
-  // OR unknown provider isn't in the strip list → returns xhigh
-  // Both are acceptable behavior; we just assert no exception thrown.
-  assert.ok(result !== undefined);
+  assert.equal(result, body);
+  assert.equal((result as any).reasoning_effort, "xhigh");
 });
 
 test("sanitizeReasoningEffortForProvider: non-object body returns unchanged", () => {
diff --git a/tests/unit/executor-base-utils.test.ts b/tests/unit/executor-base-utils.test.ts
index d3727c205e26..fd869228982d 100644
--- a/tests/unit/executor-base-utils.test.ts
+++ b/tests/unit/executor-base-utils.test.ts
@@ -122,10 +122,10 @@ test("sanitizeReasoningEffortForProvider passes through body without reasoning_e
   assert.deepEqual(result, body);
 });
 
-test("sanitizeReasoningEffortForProvider clamps xhigh to high for unsupported providers", () => {
+test("sanitizeReasoningEffortForProvider preserves xhigh unless explicitly unsupported", () => {
   const body = { reasoning_effort: "xhigh" };
   const result = base.sanitizeReasoningEffortForProvider(body, "openai", "gpt-4o") as any;
-  assert.equal(result.reasoning_effort, "high");
+  assert.equal(result.reasoning_effort, "xhigh");
 });
 
 test("sanitizeReasoningEffortForProvider preserves high effort", () => {
diff --git a/tests/unit/provider-models-config.test.ts b/tests/unit/provider-models-config.test.ts
index 0ebd754469d9..bdfcc5377977 100644
--- a/tests/unit/provider-models-config.test.ts
+++ b/tests/unit/provider-models-config.test.ts
@@ -12,6 +12,7 @@ import {
   isValidModel,
   supportsClaudeMaxEffort,
   supportsXHighEffort,
+  supportsXHighEffortForMaxNormalization,
 } from "../../open-sse/config/providerModels.ts";
 
 test("provider models helpers expose model lists and defaults", () => {
@@ -106,7 +107,7 @@ test("Claude max effort support excludes Haiku family and non-Claude IDs", () =>
   assert.equal(supportsClaudeMaxEffort("claude-future-5-0"), true);
 });
 
-test("Claude xhigh effort support defaults on for new models and opts out legacy models", () => {
+test("xhigh effort support defaults to pass-through and opts out explicit false models", () => {
   const claudeModels = new Set(getModelsByProviderId("claude").map((model) => model.id));
 
   assert.ok(claudeModels.has("claude-opus-4-8"));
@@ -115,4 +116,38 @@ test("Claude xhigh effort support defaults on for new models and opts out legacy
   assert.equal(supportsXHighEffort("claude", "claude-opus-4-6"), false);
   assert.equal(supportsXHighEffort("claude", "claude-sonnet-4-6"), false);
   assert.equal(supportsXHighEffort("claude", "claude-future-5-0"), true);
+  assert.equal(supportsXHighEffort("anthropic-compatible-test", "claude-opus-4-6"), false);
+  assert.equal(supportsXHighEffort("anthropic-compatible-test", "claude-opus-4-7"), true);
+  assert.equal(supportsXHighEffort("anthropic-compatible-cc-test", "claude-opus-4-6"), false);
+  assert.equal(supportsXHighEffort("anthropic-compatible-cc-test", "claude-opus-4-7"), true);
+  assert.equal(supportsXHighEffort("openrouter", "deepseek/deepseek-v4-pro"), true);
+  assert.equal(supportsXHighEffort("deepseek", "deepseek-v4-pro"), true);
+});
+
+test("max normalization keeps existing xhigh opt-in behavior", () => {
+  assert.equal(
+    supportsXHighEffortForMaxNormalization("openai-compatible-free1", "gemini-3.1-pro-preview"),
+    true
+  );
+  assert.equal(supportsXHighEffortForMaxNormalization("xiaomi-mimo", "mimo-v2.5-pro"), false);
+  assert.equal(
+    supportsXHighEffortForMaxNormalization("anthropic-compatible-cc-test", "claude-opus-4-6"),
+    false
+  );
+  assert.equal(
+    supportsXHighEffortForMaxNormalization("anthropic-compatible-cc-test", "claude-opus-4-7"),
+    true
+  );
+  assert.equal(
+    supportsXHighEffortForMaxNormalization("anthropic-compatible-test", "claude-opus-4-6"),
+    false
+  );
+  assert.equal(
+    supportsXHighEffortForMaxNormalization("anthropic-compatible-test", "claude-opus-4-7"),
+    true
+  );
+  assert.equal(
+    supportsXHighEffortForMaxNormalization("openrouter", "deepseek/deepseek-v4-pro"),
+    false
+  );
 });