diff --git a/src/shared/model-capability-aliases.test.ts b/src/shared/model-capability-aliases.test.ts
index b6f5b6641..4581d84c1 100644
--- a/src/shared/model-capability-aliases.test.ts
+++ b/src/shared/model-capability-aliases.test.ts
@@ -107,4 +107,14 @@ describe("model-capability-aliases", () => {
       ruleID: "claude-thinking-legacy-alias",
     })
   })
+
+  test("treats claude-opus-4-6-thinking as canonical, not as a legacy alias", () => {
+    const result = resolveModelIDAlias("claude-opus-4-6-thinking")
+
+    expect(result).toEqual({
+      requestedModelID: "claude-opus-4-6-thinking",
+      canonicalModelID: "claude-opus-4-6-thinking",
+      source: "canonical",
+    })
+  })
 })
diff --git a/src/shared/model-capability-aliases.ts b/src/shared/model-capability-aliases.ts
index fe7ef6b3b..9d1412225 100644
--- a/src/shared/model-capability-aliases.ts
+++ b/src/shared/model-capability-aliases.ts
@@ -41,8 +41,8 @@ const EXACT_ALIAS_RULES_BY_MODEL: ReadonlyMap<string, ExactAliasRule> = new Map(
 const PATTERN_ALIAS_RULES: ReadonlyArray<PatternAliasRule> = [
   {
     ruleID: "claude-thinking-legacy-alias",
-    description: "Normalizes legacy Claude Opus thinking suffixes (4-6, 4-7) to the canonical snapshot ID.",
-    match: (normalizedModelID) => /^claude-opus-4-(?:6|7)-thinking$/.test(normalizedModelID),
+    description: "Normalizes the legacy claude-opus-4-7-thinking id to the canonical snapshot ID.",
+    match: (normalizedModelID) => /^claude-opus-4-7-thinking$/.test(normalizedModelID),
     canonicalize: () => "claude-opus-4-7",
   },
   {