Add Claude Opus 5 model

apps/server/src/provider/Layers/ClaudeAdapter.test.ts

@@ -530,6 +530,29 @@ describe("ClaudeAdapterLive", () => {
     );
   });
 
+  it.effect("preserves xhigh effort for Claude Opus 5", () => {
+    const harness = makeHarness();
+    return Effect.gen(function* () {
+      const adapter = yield* ClaudeAdapter;
+      yield* adapter.startSession({
+        threadId: THREAD_ID,
+        provider: ProviderDriverKind.make("claudeAgent"),
+        modelSelection: createModelSelection(
+          ProviderInstanceId.make("claudeAgent"),
+          "claude-opus-5",
+          [{ id: "effort", value: "xhigh" }],
+        ),
+        runtimeMode: "full-access",
+      });
+
+      const createInput = harness.getLastCreateQueryInput();
+      assert.equal(createInput?.options.effort, "xhigh");
+    }).pipe(
+      Effect.provideService(Random.Random, makeDeterministicRandomService()),
+      Effect.provide(harness.layer),
+    );
+  });
+
   it.effect("falls back to default effort when unsupported max is requested for Sonnet 4.6", () => {
     const harness = makeHarness();
     return Effect.gen(function* () {

apps/server/src/provider/Layers/ClaudeProvider.ts

@@ -51,6 +51,7 @@ const CLAUDE_PRESENTATION = {
   displayName: "Claude",
   showInteractionModeToggle: true,
 } as const;
+const MINIMUM_CLAUDE_OPUS_5_VERSION = "2.1.219";
 const MINIMUM_CLAUDE_FABLE_5_VERSION = "2.1.169";
 const MINIMUM_CLAUDE_OPUS_4_8_VERSION = "2.1.154";
 const MINIMUM_CLAUDE_OPUS_4_7_VERSION = "2.1.111";
@@ -87,6 +88,42 @@ const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
       ],
     }),
   },
+  {
+    slug: "claude-opus-5",
+    name: "Claude Opus 5",
+    isCustom: false,
+    capabilities: createModelCapabilities({
+      optionDescriptors: [
+        buildSelectOptionDescriptor({
+          id: "effort",
+          label: "Reasoning",
+          options: [
+            { value: "low", label: "Low" },
+            { value: "medium", label: "Medium" },
+            { value: "high", label: "High", isDefault: true },
+            { value: "xhigh", label: "Extra High" },
+            { value: "max", label: "Max" },
+            { value: "ultracode", label: "Ultracode" },
+            { value: "ultrathink", label: "Ultrathink" },
+          ],
+          promptInjectedValues: ["ultrathink"],
+        }),
+        buildBooleanOptionDescriptor({
+          id: "fastMode",
+          label: "Fast Mode",
+        }),
+        buildSelectOptionDescriptor({
+          id: "contextWindow",
+          label: "Context Window",
+          // Claude Code selects the 1M variant explicitly (`claude-opus-5[1m]`).
+          options: [
+            { value: "200k", label: "200k" },
+            { value: "1m", label: "1M", isDefault: true },
+          ],
+        }),
+      ],
+    }),
+  },
   {
     slug: "claude-opus-4-8",
     name: "Claude Opus 4.8",
@@ -272,6 +309,10 @@ const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
   },
 ];
 
+function supportsClaudeOpus5(version: string | null | undefined): boolean {
+  return version ? compareSemverVersions(version, MINIMUM_CLAUDE_OPUS_5_VERSION) >= 0 : false;
+}
+
 function supportsClaudeFable5(version: string | null | undefined): boolean {
   return version ? compareSemverVersions(version, MINIMUM_CLAUDE_FABLE_5_VERSION) >= 0 : false;
 }
@@ -288,6 +329,9 @@ function getBuiltInClaudeModelsForVersion(
   version: string | null | undefined,
 ): ReadonlyArray<ServerProviderModel> {
   return BUILT_IN_MODELS.filter((model) => {
+    if (model.slug === "claude-opus-5") {
+      return supportsClaudeOpus5(version);
+    }
     if (model.slug === "claude-fable-5") {
       return supportsClaudeFable5(version);
     }
@@ -301,6 +345,11 @@ function getBuiltInClaudeModelsForVersion(
   });
 }
 
+function formatClaudeOpus5UpgradeMessage(version: string | null): string {
+  const versionLabel = version ? `v${version}` : "the installed version";
+  return `Claude Code ${versionLabel} is too old for Claude Opus 5. Upgrade to v${MINIMUM_CLAUDE_OPUS_5_VERSION} or newer to access it.`;
+}
+
 function formatClaudeFable5UpgradeMessage(version: string | null): string {
   const versionLabel = version ? `v${version}` : "the installed version";
   return `Claude Code ${versionLabel} is too old for Claude Fable 5. Upgrade to v${MINIMUM_CLAUDE_FABLE_5_VERSION} or newer to access it.`;
@@ -360,6 +409,7 @@ export function normalizeClaudeCliEffort(
   if (
     effort === "xhigh" &&
     model !== "claude-fable-5" &&
+    model !== "claude-opus-5" &&
     model !== "claude-opus-4-8" &&
     model !== "claude-sonnet-5"
   ) {
@@ -837,13 +887,15 @@ export const checkClaudeProviderStatus = Effect.fn("checkClaudeProviderStatus")(
     claudeSettings.customModels,
     DEFAULT_CLAUDE_MODEL_CAPABILITIES,
   );
-  const versionUpgradeMessage = supportsClaudeFable5(parsedVersion)
+  const versionUpgradeMessage = supportsClaudeOpus5(parsedVersion)
     ? undefined
-    : supportsClaudeOpus48(parsedVersion)
-      ? formatClaudeFable5UpgradeMessage(parsedVersion)
-      : supportsClaudeOpus47(parsedVersion)
-        ? formatClaudeOpus48UpgradeMessage(parsedVersion)
-        : formatClaudeOpus47UpgradeMessage(parsedVersion);
+    : supportsClaudeFable5(parsedVersion)
+      ? formatClaudeOpus5UpgradeMessage(parsedVersion)
+      : supportsClaudeOpus48(parsedVersion)
+        ? formatClaudeFable5UpgradeMessage(parsedVersion)
+        : supportsClaudeOpus47(parsedVersion)
+          ? formatClaudeOpus48UpgradeMessage(parsedVersion)
+          : formatClaudeOpus47UpgradeMessage(parsedVersion);
 
   const capabilities = resolveCapabilities
     ? yield* resolveCapabilities(claudeSettings).pipe(Effect.orElseSucceed(() => undefined))

apps/server/src/provider/Layers/ProviderRegistry.test.ts

@@ -1842,6 +1842,62 @@ it.layer(Layer.mergeAll(NodeServices.layer, ServerSettingsModule.layerTest(), Te
         ),
       );
 
+      it.effect("includes Claude Opus 5 on supported Claude Code versions", () =>
+        Effect.gen(function* () {
+          const status = yield* checkClaudeProviderStatus(
+            defaultClaudeSettings,
+            claudeCapabilities(),
+          );
+          const opus5 = status.models.find((model) => model.slug === "claude-opus-5");
+          assert.strictEqual(opus5?.name, "Claude Opus 5");
+        }).pipe(
+          Effect.provide(
+            mockSpawnerLayer((args) => {
+              const joined = args.join(" ");
+              if (joined === "--version") return { stdout: "2.1.219\n", stderr: "", code: 0 };
+              if (joined === "auth status")
+                return {
+                  stdout: '{"loggedIn":true,"authMethod":"claude.ai"}\n',
+                  stderr: "",
+                  code: 0,
+                };
+              throw new Error(`Unexpected args: ${joined}`);
+            }),
+          ),
+        ),
+      );
+
+      it.effect("hides Claude Opus 5 on older Claude Code versions", () =>
+        Effect.gen(function* () {
+          const status = yield* checkClaudeProviderStatus(
+            defaultClaudeSettings,
+            claudeCapabilities(),
+          );
+          assert.strictEqual(
+            status.models.some((model) => model.slug === "claude-opus-5"),
+            false,
+          );
+          assert.strictEqual(
+            status.message,
+            "Claude Code v2.1.218 is too old for Claude Opus 5. Upgrade to v2.1.219 or newer to access it.",
+          );
+        }).pipe(
+          Effect.provide(
+            mockSpawnerLayer((args) => {
+              const joined = args.join(" ");
+              if (joined === "--version") return { stdout: "2.1.218\n", stderr: "", code: 0 };
+              if (joined === "auth status")
+                return {
+                  stdout: '{"loggedIn":true,"authMethod":"claude.ai"}\n',
+                  stderr: "",
+                  code: 0,
+                };
+              throw new Error(`Unexpected args: ${joined}`);
+            }),
+          ),
+        ),
+      );
+
       it.effect("includes Claude Fable 5 on supported Claude Code versions", () =>
         Effect.gen(function* () {
           const status = yield* checkClaudeProviderStatus(

packages/contracts/src/model.ts

@@ -176,7 +176,10 @@ export const MODEL_SLUG_ALIASES_BY_PROVIDER: Partial<
     "gpt-5.3-spark": "gpt-5.3-codex-spark",
   },
   [CLAUDE_DRIVER_KIND]: {
-    opus: "claude-opus-4-8",
+    opus: "claude-opus-5",
+    "opus-5": "claude-opus-5",
+    "claude-opus-5.0": "claude-opus-5",
+    "claude-opus-5-0": "claude-opus-5",
     "opus-4.8": "claude-opus-4-8",
     "claude-opus-4.8": "claude-opus-4-8",
     "opus-4.7": "claude-opus-4-7",

packages/shared/src/model.test.ts

@@ -151,7 +151,7 @@ describe("model slug normalization", () => {
   it("preserves exact custom slugs instead of expanding provider aliases", () => {
     const claude = ProviderDriverKind.make("claudeAgent");
 
-    expect(normalizeModelSlug("opus", claude)).toBe("claude-opus-4-8");
+    expect(normalizeModelSlug("opus", claude)).toBe("claude-opus-5");
     expect(normalizeCustomModelSlug(" opus ")).toBe("opus");
   });
 });