fix(anthropic-effort): clamp variant against mutable request message

src/hooks/anthropic-effort/hook.ts

@@ -1,6 +1,6 @@
 import { log, normalizeModelID } from "../../shared"
 
-const OPUS_4_6_PATTERN = /claude-opus-4[-.]6/i
+const OPUS_PATTERN = /claude-opus/i
 
 function isClaudeProvider(providerID: string, modelID: string): boolean {
   if (["anthropic", "google-vertex-anthropic", "opencode"].includes(providerID)) return true
@@ -8,9 +8,9 @@ function isClaudeProvider(providerID: string, modelID: string): boolean {
   return false
 }
 
-function isOpus46(modelID: string): boolean {
+function isOpusModel(modelID: string): boolean {
   const normalized = normalizeModelID(modelID)
-  return OPUS_4_6_PATTERN.test(normalized)
+  return OPUS_PATTERN.test(normalized)
 }
 
 interface ChatParamsInput {
@@ -54,7 +54,7 @@ export function createAnthropicEffortHook() {
       if (!isClaudeProvider(model.providerID, model.modelID)) return
       if (output.options.effort !== undefined) return
 
-      const opus = isOpus46(model.modelID)
+      const opus = isOpusModel(model.modelID)
       const clamped = clampVariant(message.variant, opus)
       output.options.effort = clamped
 

src/hooks/anthropic-effort/index.test.ts

@@ -116,6 +116,21 @@ describe("createAnthropicEffortHook", () => {
       //#then should normalize and inject effort
       expect(output.options.effort).toBe("max")
     })
+
+    it("should preserve max for other opus model IDs such as opus-4-5", async () => {
+      //#given another opus model id that is not 4.6
+      const hook = createAnthropicEffortHook()
+      const { input, output } = createMockParams({
+        modelID: "claude-opus-4-5",
+      })
+
+      //#when chat.params hook is called
+      await hook["chat.params"](input, output)
+
+      //#then max should still be treated as valid for opus family
+      expect(output.options.effort).toBe("max")
+      expect(input.message.variant).toBe("max")
+    })
   })
 
   describe("conditions NOT met - should skip", () => {