diff --git a/src/agents/model-scan.ts b/src/agents/model-scan.ts
index 5554692e4a1..53c49e94cfa 100644
--- a/src/agents/model-scan.ts
+++ b/src/agents/model-scan.ts
@@ -8,6 +8,7 @@ import {
   type Tool,
 } from "@mariozechner/pi-ai";
 import { Type } from "@sinclair/typebox";
+import { inferParamBFromIdOrName } from "../shared/model-param-b.js";
 
 const OPENROUTER_MODELS_URL = "https://openrouter.ai/api/v1/models";
 const DEFAULT_TIMEOUT_MS = 12_000;
@@ -97,26 +98,6 @@ function normalizeCreatedAtMs(value: unknown): number | null {
   return Math.round(value * 1000);
 }
 
-function inferParamBFromIdOrName(text: string): number | null {
-  const raw = text.toLowerCase();
-  const matches = raw.matchAll(/(?:^|[^a-z0-9])[a-z]?(\d+(?:\.\d+)?)b(?:[^a-z0-9]|$)/g);
-  let best: number | null = null;
-  for (const match of matches) {
-    const numRaw = match[1];
-    if (!numRaw) {
-      continue;
-    }
-    const value = Number(numRaw);
-    if (!Number.isFinite(value) || value <= 0) {
-      continue;
-    }
-    if (best === null || value > best) {
-      best = value;
-    }
-  }
-  return best;
-}
-
 function parseModality(modality: string | null): Array<"text" | "image"> {
   if (!modality) {
     return ["text"];
diff --git a/src/security/audit-extra.sync.ts b/src/security/audit-extra.sync.ts
index 4496dfc3bbf..895776249ea 100644
--- a/src/security/audit-extra.sync.ts
+++ b/src/security/audit-extra.sync.ts
@@ -16,6 +16,7 @@ import { resolveBrowserConfig } from "../browser/config.js";
 import { formatCliCommand } from "../cli/command-format.js";
 import { resolveGatewayAuth } from "../gateway/auth.js";
 import { resolveNodeCommandAllowlist } from "../gateway/node-command-policy.js";
+import { inferParamBFromIdOrName } from "../shared/model-param-b.js";
 
 export type SecurityAuditFinding = {
   checkId: string;
@@ -142,26 +143,6 @@ const WEAK_TIER_MODEL_PATTERNS: Array<{ id: string; re: RegExp; label: string }>
   { id: "anthropic.haiku", re: /\bhaiku\b/i, label: "Haiku tier (smaller model)" },
 ];
 
-function inferParamBFromIdOrName(text: string): number | null {
-  const raw = text.toLowerCase();
-  const matches = raw.matchAll(/(?:^|[^a-z0-9])[a-z]?(\d+(?:\.\d+)?)b(?:[^a-z0-9]|$)/g);
-  let best: number | null = null;
-  for (const match of matches) {
-    const numRaw = match[1];
-    if (!numRaw) {
-      continue;
-    }
-    const value = Number(numRaw);
-    if (!Number.isFinite(value) || value <= 0) {
-      continue;
-    }
-    if (best === null || value > best) {
-      best = value;
-    }
-  }
-  return best;
-}
-
 function isGptModel(id: string): boolean {
   return /\bgpt-/i.test(id);
 }
diff --git a/src/shared/model-param-b.ts b/src/shared/model-param-b.ts
new file mode 100644
index 00000000000..e6fc3bda5cd
--- /dev/null
+++ b/src/shared/model-param-b.ts
@@ -0,0 +1,19 @@
+export function inferParamBFromIdOrName(text: string): number | null {
+  const raw = text.toLowerCase();
+  const matches = raw.matchAll(/(?:^|[^a-z0-9])[a-z]?(\d+(?:\.\d+)?)b(?:[^a-z0-9]|$)/g);
+  let best: number | null = null;
+  for (const match of matches) {
+    const numRaw = match[1];
+    if (!numRaw) {
+      continue;
+    }
+    const value = Number(numRaw);
+    if (!Number.isFinite(value) || value <= 0) {
+      continue;
+    }
+    if (best === null || value > best) {
+      best = value;
+    }
+  }
+  return best;
+}