diff --git a/apps/cli/src/runtime/interactive/computer-user.test.ts b/apps/cli/src/runtime/interactive/computer-user.test.ts
index 0034571524..8e5e669ec5 100644
--- a/apps/cli/src/runtime/interactive/computer-user.test.ts
+++ b/apps/cli/src/runtime/interactive/computer-user.test.ts
@@ -186,7 +186,7 @@ describe("createInteractiveComputerUser", () => {
 		await result?.dispose();
 	});
 
-	it("starts the helper with one adaptive reasoning snapshot", async () => {
+	it("starts the helper with one moderate adaptive reasoning snapshot", async () => {
 		const started = await startStubBackend();
 		server = started.server;
 		destroyConnections = started.destroyConnections;
@@ -204,9 +204,14 @@ describe("createInteractiveComputerUser", () => {
 			stop: vi.fn(async () => {}),
 			dispose: vi.fn(async () => {}),
 		});
+		const driverConfig = {
+			...makeConfig(),
+			thinking: true,
+			reasoningEffort: "high" as const,
+		};
 
 		const result = await createInteractiveComputerUser({
-			config: makeConfig(),
+			config: driverConfig,
 			providerSettingsManager: makeSettings({
 				provider: "anthropic",
 				apiKey: "sk-ant-x",
@@ -223,7 +228,7 @@ describe("createInteractiveComputerUser", () => {
 			notifyDriver: () => {},
 			env: {
 				CLINE_COMPUTER_USE_PORT: String(started.port),
-				CLINE_COMPUTER_USER_MODEL: "claude-opus-4-7",
+				CLINE_COMPUTER_USER_MODEL: "anthropic/claude-sonnet-5",
 			} as NodeJS.ProcessEnv,
 		});
 		const startTool = result?.driverTools.find(
@@ -236,14 +241,14 @@ describe("createInteractiveComputerUser", () => {
 			interactive: true,
 			config: expect.objectContaining({
 				providerId: "anthropic",
-				modelId: "claude-opus-4-7",
+				modelId: "claude-sonnet-5",
 				thinking: true,
-				reasoningEffort: "high",
+				reasoningEffort: "medium",
 				providerConfig: expect.objectContaining({
 					providerId: "anthropic",
-					modelId: "claude-opus-4-7",
+					modelId: "claude-sonnet-5",
 					thinking: true,
-					reasoningEffort: "high",
+					reasoningEffort: "medium",
 					clientType: undefined,
 					routingProviderId: undefined,
 					thinkingBudgetTokens: undefined,
@@ -253,6 +258,10 @@ describe("createInteractiveComputerUser", () => {
 		expect(start.mock.calls[0]?.[0]?.config).not.toHaveProperty(
 			"thinkingBudgetTokens",
 		);
+		expect(driverConfig).toMatchObject({
+			thinking: true,
+			reasoningEffort: "high",
+		});
 		await result?.dispose();
 	});
 
@@ -327,6 +336,14 @@ describe("resolveHelperModelId", () => {
 		).toBe("claude-opus-4-7");
 	});
 
+	it("removes the redundant namespace for the direct Anthropic provider", () => {
+		expect(
+			resolveHelperModelId(undefined, {
+				CLINE_COMPUTER_USER_MODEL: "anthropic/claude-sonnet-5",
+			} as NodeJS.ProcessEnv),
+		).toBe("claude-sonnet-5");
+	});
+
 	it("falls back to the Anthropic provider entry's saved model", () => {
 		expect(
 			resolveHelperModelId(
diff --git a/apps/cli/src/runtime/interactive/computer-user.ts b/apps/cli/src/runtime/interactive/computer-user.ts
index ddb6e69893..aaa1f89af9 100644
--- a/apps/cli/src/runtime/interactive/computer-user.ts
+++ b/apps/cli/src/runtime/interactive/computer-user.ts
@@ -40,9 +40,16 @@ const HELPER_DEFAULT_MODEL_ID = "claude-sonnet-4-6";
 const HELPER_MODEL_ENV_VAR = "CLINE_COMPUTER_USER_MODEL";
 const HELPER_REASONING = {
 	thinking: true,
-	reasoningEffort: "high" as const,
+	reasoningEffort: "medium" as const,
 };
 
+function toDirectAnthropicModelId(modelId: string): string {
+	const directProviderPrefix = `${HELPER_PROVIDER_ID}/`;
+	return modelId.startsWith(directProviderPrefix)
+		? modelId.slice(directProviderPrefix.length)
+		: modelId;
+}
+
 /**
  * Resolves the helper's Anthropic model id. The helper's model is chosen
  * independently of the driver's: CLINE_COMPUTER_USER_MODEL wins, then the
@@ -58,13 +65,13 @@ export function resolveHelperModelId(
 ): string {
 	const fromEnv = env[HELPER_MODEL_ENV_VAR]?.trim();
 	if (fromEnv) {
-		return fromEnv;
+		return toDirectAnthropicModelId(fromEnv);
 	}
 	if (
 		typeof helperSettings?.model === "string" &&
 		helperSettings.model.trim()
 	) {
-		return helperSettings.model.trim();
+		return toDirectAnthropicModelId(helperSettings.model.trim());
 	}
 	return HELPER_DEFAULT_MODEL_ID;
 }
diff --git a/sdk/packages/llms/src/providers/routing/provider-options.test.ts b/sdk/packages/llms/src/providers/routing/provider-options.test.ts
index c150fda7b4..04da70eb4b 100644
--- a/sdk/packages/llms/src/providers/routing/provider-options.test.ts
+++ b/sdk/packages/llms/src/providers/routing/provider-options.test.ts
@@ -593,6 +593,30 @@ describe("composeAiSdkProviderOptions: Anthropic thinking precedence", () => {
 				},
 			],
 		},
+		{
+			name: "Sonnet 5 uses adaptive thinking with medium effort",
+			request: {
+				providerId: "anthropic",
+				modelId: "claude-sonnet-5",
+				reasoning: { enabled: true, effort: "medium" },
+			},
+			context: {
+				family: "claude-sonnet",
+				reasoningOptions: effortOptions([
+					"low",
+					"medium",
+					"high",
+					"xhigh",
+					"max",
+				]),
+			},
+			expect: [
+				{
+					bucket: "anthropic",
+					has: { thinking: ADAPTIVE_THINKING, effort: "medium" },
+				},
+			],
+		},
 		{
 			name: "Sonnet 5 emits the explicit disabled thinking control",
 			request: {