diff --git a/src/shared/model-param-b.test.ts b/src/shared/model-param-b.test.ts
index 5359f3bc39d..c50a1064b7c 100644
--- a/src/shared/model-param-b.test.ts
+++ b/src/shared/model-param-b.test.ts
@@ -10,6 +10,12 @@ describe("shared/model-param-b", () => {
     expect(inferParamBFromIdOrName("(70b) + m1.5b + qwen-14b")).toBe(70);
   });
 
+  it("matches both tokens when two are separated by a single delimiter", () => {
+    expect(inferParamBFromIdOrName("8b 70b")).toBe(70);
+    expect(inferParamBFromIdOrName("8b-70b")).toBe(70);
+    expect(inferParamBFromIdOrName("7b-13b")).toBe(13);
+  });
+
   it("ignores malformed, zero, and non-delimited matches", () => {
     expect(inferParamBFromIdOrName("abc70beta 0b x70b2")).toBeNull();
     expect(inferParamBFromIdOrName("model 0b")).toBeNull();
diff --git a/src/shared/model-param-b.ts b/src/shared/model-param-b.ts
index 6c564ee5d4f..1c89609c59e 100644
--- a/src/shared/model-param-b.ts
+++ b/src/shared/model-param-b.ts
@@ -4,7 +4,9 @@ import { normalizeLowercaseStringOrEmpty } from "@openclaw/normalization-core/st
 /** Infers the largest `<number>b` parameter-size token from a model id or display name. */
 export function inferParamBFromIdOrName(text: string): number | null {
   const raw = normalizeLowercaseStringOrEmpty(text);
-  const matches = raw.matchAll(/(?:^|[^a-z0-9])[a-z]?(\d+(?:\.\d+)?)b(?:[^a-z0-9]|$)/g);
+  // Trailing boundary is a lookahead so two adjacent `<num>b` tokens sharing one delimiter (e.g.
+  // "8b 70b" / "8b-70b") both match; a consuming boundary ate the delimiter and skipped the second.
+  const matches = raw.matchAll(/(?:^|[^a-z0-9])[a-z]?(\d+(?:\.\d+)?)b(?=[^a-z0-9]|$)/g);
   let best: number | null = null;
   for (const match of matches) {
     const numRaw = match[1];