feat(cli): treat opus 4.8 as adaptive thinking model like 4.7

.changeset/opus-4-8-adaptive-thinking.md

@@ -0,0 +1,5 @@
+---
+"@kilocode/cli": patch
+---
+
+Treat Claude Opus 4.8 as an adaptive thinking model, matching Opus 4.7.

packages/opencode/src/plugin/github-copilot/models.ts

@@ -125,7 +125,9 @@ function build(key: string, remote: Item, url: string, prev?: Model): Model {
         variants[effort] = {
           thinking: {
             type: "adaptive",
-            ...(model.api.id.includes("opus-4.7") ? { display: "summarized" } : {}),
+            ...(model.api.id.includes("opus-4.7") || model.api.id.includes("opus-4.8")
+              ? { display: "summarized" }
+              : {}), // kilocode_change - treat opus-4.8 like opus-4.7
           },
           effort,
         }

packages/opencode/src/provider/transform.ts

@@ -542,7 +542,8 @@ function openaiReasoningEfforts(apiId: string, releaseDate: string): string[] |
 }
 
 function anthropicAdaptiveEfforts(apiId: string): string[] | null {
-  if (["opus-4-7", "opus-4.7"].some((v) => apiId.includes(v))) {
+  if (["opus-4-7", "opus-4.7", "opus-4-8", "opus-4.8"].some((v) => apiId.includes(v))) {
+    // kilocode_change - treat opus-4.8 like opus-4.7
     return ["low", "medium", "high", "xhigh", "max"]
   }
   if (["opus-4-6", "opus-4.6", "sonnet-4-6", "sonnet-4.6"].some((v) => apiId.includes(v))) {
@@ -780,7 +781,8 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
       if (adaptiveEfforts) {
         let efforts = [...adaptiveEfforts]
         if (model.providerID === "github-copilot") {
-          if (model.api.id.includes("opus-4.7")) {
+          if (model.api.id.includes("opus-4.7") || model.api.id.includes("opus-4.8")) {
+            // kilocode_change - treat opus-4.8 like opus-4.7
             efforts = ["medium"]
           }
           // Efforts currently supported are: low, medium, high
@@ -792,7 +794,8 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
             {
               thinking: {
                 type: "adaptive",
-                ...(model.api.id.includes("opus-4-7") || model.api.id.includes("opus-4.7")
+                // kilocode_change - treat opus-4.8 like opus-4.7
+                ...(["opus-4-7", "opus-4.7", "opus-4-8", "opus-4.8"].some((v) => model.api.id.includes(v))
                   ? { display: "summarized" }
                   : {}),
               },
@@ -827,7 +830,8 @@ export function variants(model: Provider.Model): Record<string, Record<string, a
               reasoningConfig: {
                 type: "adaptive",
                 maxReasoningEffort: effort,
-                ...(model.api.id.includes("opus-4-7") || model.api.id.includes("opus-4.7")
+                // kilocode_change - treat opus-4.8 like opus-4.7
+                ...(["opus-4-7", "opus-4.7", "opus-4-8", "opus-4.8"].some((v) => model.api.id.includes(v))
                   ? { display: "summarized" }
                   : {}),
               },

packages/opencode/test/kilocode/transform-opus-4.7.test.ts

@@ -75,6 +75,50 @@ describe("ProviderTransform.variants - Claude Opus 4.7", () => {
     })
   })
 
+  test("opus-4-8 returns adaptive thinking variants including xhigh (native anthropic)", () => {
+    const model = mockModel({
+      api: {
+        id: "claude-opus-4-8",
+        url: "https://api.anthropic.com",
+        npm: "@ai-sdk/anthropic",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(Object.keys(result)).toEqual(["low", "medium", "high", "xhigh", "max"])
+    expect(result.xhigh).toEqual({
+      thinking: { type: "adaptive", display: "summarized" },
+      effort: "xhigh",
+    })
+  })
+
+  test("opus-4.8 dot-form returns adaptive thinking variants via @ai-sdk/gateway", () => {
+    const model = mockModel({
+      id: "anthropic/claude-opus-4-8",
+      api: {
+        id: "anthropic/claude-opus-4.8",
+        url: "https://gateway.ai",
+        npm: "@ai-sdk/gateway",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(Object.keys(result)).toEqual(["low", "medium", "high", "xhigh", "max"])
+  })
+
+  test("opus-4-8 on bedrock returns adaptive reasoningConfig with xhigh", () => {
+    const model = mockModel({
+      api: {
+        id: "anthropic.claude-opus-4-8",
+        url: "https://bedrock.amazonaws.com",
+        npm: "@ai-sdk/amazon-bedrock",
+      },
+    })
+    const result = ProviderTransform.variants(model)
+    expect(Object.keys(result)).toEqual(["low", "medium", "high", "xhigh", "max"])
+    expect(result.xhigh).toEqual({
+      reasoningConfig: { type: "adaptive", maxReasoningEffort: "xhigh", display: "summarized" },
+    })
+  })
+
   test("opus-4-6 keeps original adaptive efforts without xhigh", () => {
     const model = mockModel({
       api: {