feat: add Claude Opus 5 model

apps/server/src/mcp/toolkits/subagent/handlers.ts

@@ -472,6 +472,7 @@ const buildModelSources = (runtime: SubagentRuntime) =>
           driverKind: providerInstance.driverKind,
           models: snapshot.models.map((providerModel) => ({
             slug: providerModel.slug,
+            isCustom: providerModel.isCustom,
             optionDescriptors: providerModel.capabilities?.optionDescriptors,
             defaultOptions: buildProviderOptionSelectionsFromDescriptors(
               providerModel.capabilities?.optionDescriptors,

apps/server/src/mcp/toolkits/thread/handlers.ts

@@ -547,6 +547,7 @@ const makeActiveThreadStartRuntime = Effect.fn("ThreadToolkit.makeActiveRuntime"
             driverKind: providerInstance.driverKind,
             models: snapshot.models.map((providerModel) => ({
               slug: providerModel.slug,
+              isCustom: providerModel.isCustom,
               optionDescriptors: providerModel.capabilities?.optionDescriptors,
               defaultOptions: buildProviderOptionSelectionsFromDescriptors(
                 providerModel.capabilities?.optionDescriptors,
@@ -728,6 +729,7 @@ const makeActiveThreadStartRuntime = Effect.fn("ThreadToolkit.makeActiveRuntime"
           driverKind: providerInstance.driverKind,
           models: snapshot.models.map((providerModel) => ({
             slug: providerModel.slug,
+            isCustom: providerModel.isCustom,
             optionDescriptors: providerModel.capabilities?.optionDescriptors,
             defaultOptions: buildProviderOptionSelectionsFromDescriptors(
               providerModel.capabilities?.optionDescriptors,

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

@@ -658,6 +658,29 @@ 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* () {
@@ -1435,7 +1458,7 @@ describe("ClaudeAdapterLive", () => {
       const adapter = yield* ClaudeAdapter;
       const requestedModel = createModelSelection(
         ProviderInstanceId.make("claudeAgent"),
-        "claude-fable-5",
+        "claude-opus-5",
       );
       const runtimeEventsFiber = yield* Stream.takeUntil(
         adapter.streamEvents,
@@ -1615,7 +1638,7 @@ describe("ClaudeAdapterLive", () => {
         parent_tool_use_id: null,
         message: {
           id: "assistant-message-effective-model-alias",
-          model: "claude-opus-4-8-20260718",
+          model: "claude-opus-5-20260718",
           content: [{ type: "text", text: "Alias answer" }],
         },
       } as unknown as SDKMessage);
@@ -1628,7 +1651,7 @@ describe("ClaudeAdapterLive", () => {
         session_id: "sdk-session-effective-model-alias",
         uuid: "result-effective-model-alias",
         modelUsage: {
-          "claude-opus-4-8-20260718": {
+          "claude-opus-5-20260718": {
             contextWindow: 1_000_000,
             maxOutputTokens: 128_000,
           },

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

@@ -518,6 +518,7 @@ function selectedClaudeContextWindow(
   modelSelection: ModelSelection | undefined,
 ): number | undefined {
   switch (modelSelection?.model) {
+    case "claude-opus-5":
     case "claude-opus-4-8":
     case "claude-opus-4-7":
       // Always 1M at the API; these models expose no contextWindow option.

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

@@ -47,10 +47,33 @@ 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";
 
+const CLAUDE_OPUS_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",
+    }),
+  ],
+});
+
 const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
   {
     slug: "claude-fable-5",
@@ -84,31 +107,10 @@ const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
     }),
   },
   {
-    slug: "claude-opus-4-8",
-    name: "Claude Opus 4.8",
+    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",
-        }),
-      ],
-    }),
+    capabilities: CLAUDE_OPUS_CAPABILITIES,
   },
   {
     slug: "claude-opus-4-7",
@@ -268,12 +270,12 @@ const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
   },
 ];
 
-function supportsClaudeFable5(version: string | null | undefined): boolean {
-  return version ? compareSemverVersions(version, MINIMUM_CLAUDE_FABLE_5_VERSION) >= 0 : false;
+function supportsClaudeOpus5(version: string | null | undefined): boolean {
+  return version ? compareSemverVersions(version, MINIMUM_CLAUDE_OPUS_5_VERSION) >= 0 : false;
 }
 
-function supportsClaudeOpus48(version: string | null | undefined): boolean {
-  return version ? compareSemverVersions(version, MINIMUM_CLAUDE_OPUS_4_8_VERSION) >= 0 : false;
+function supportsClaudeFable5(version: string | null | undefined): boolean {
+  return version ? compareSemverVersions(version, MINIMUM_CLAUDE_FABLE_5_VERSION) >= 0 : false;
 }
 
 function supportsClaudeOpus47(version: string | null | undefined): boolean {
@@ -284,27 +286,27 @@ 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);
     }
-    if (model.slug === "claude-opus-4-8") {
-      return supportsClaudeOpus48(version);
-    }
     if (model.slug === "claude-opus-4-7") {
       return supportsClaudeOpus47(version);
     }
     return true;
   });
 }
 
-function formatClaudeFable5UpgradeMessage(version: string | null): string {
+function formatClaudeOpus5UpgradeMessage(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.`;
+  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 formatClaudeOpus48UpgradeMessage(version: string | null): string {
+function formatClaudeFable5UpgradeMessage(version: string | null): string {
   const versionLabel = version ? `v${version}` : "the installed version";
-  return `Claude Code ${versionLabel} is too old for Claude Opus 4.8. Upgrade to v${MINIMUM_CLAUDE_OPUS_4_8_VERSION} or newer to access it.`;
+  return `Claude Code ${versionLabel} is too old for Claude Fable 5. Upgrade to v${MINIMUM_CLAUDE_FABLE_5_VERSION} or newer to access it.`;
 }
 
 function formatClaudeOpus47UpgradeMessage(version: string | null): string {
@@ -314,6 +316,11 @@ function formatClaudeOpus47UpgradeMessage(version: string | null): string {
 
 export function getClaudeModelCapabilities(model: string | null | undefined): ModelCapabilities {
   const slug = model?.trim();
+  // Persisted 4.8 selections remain runnable, but 4.8 is intentionally absent
+  // from the advertised model catalog now that Opus 5 replaces it.
+  if (slug === "claude-opus-4-8") {
+    return CLAUDE_OPUS_CAPABILITIES;
+  }
   return (
     BUILT_IN_MODELS.find((candidate) => candidate.slug === slug)?.capabilities ??
     DEFAULT_CLAUDE_MODEL_CAPABILITIES
@@ -356,6 +363,7 @@ export function normalizeClaudeCliEffort(
   if (
     effort === "xhigh" &&
     model !== "claude-fable-5" &&
+    model !== "claude-opus-5" &&
     model !== "claude-opus-4-8" &&
     model !== "claude-sonnet-5"
   ) {
@@ -704,7 +712,7 @@ export const checkClaudeProviderStatus = Effect.fn("checkClaudeProviderStatus")(
   const resolvedEnvironment = environment ?? process.env;
   const checkedAt = DateTime.formatIso(yield* DateTime.now);
   const allModels = providerModelsFromSettings(
-    BUILT_IN_MODELS,
+    getBuiltInClaudeModelsForVersion(null),
     claudeSettings.customModels,
     DEFAULT_CLAUDE_MODEL_CAPABILITIES,
   );
@@ -772,6 +780,11 @@ export const checkClaudeProviderStatus = Effect.fn("checkClaudeProviderStatus")(
 
   const version = versionProbe.success.value;
   const parsedVersion = parseGenericCliVersion(`${version.stdout}\n${version.stderr}`);
+  const versionedModels = providerModelsFromSettings(
+    getBuiltInClaudeModelsForVersion(parsedVersion),
+    claudeSettings.customModels,
+    DEFAULT_CLAUDE_MODEL_CAPABILITIES,
+  );
   if (version.code !== 0) {
     yield* Effect.logWarning("Claude Agent CLI version probe exited with a non-zero status.", {
       exitCode: version.code,
@@ -782,7 +795,7 @@ export const checkClaudeProviderStatus = Effect.fn("checkClaudeProviderStatus")(
       presentation: CLAUDE_PRESENTATION,
       enabled: claudeSettings.enabled,
       checkedAt,
-      models: allModels,
+      models: versionedModels,
       probe: {
         installed: true,
         version: parsedVersion,
@@ -793,17 +806,13 @@ export const checkClaudeProviderStatus = Effect.fn("checkClaudeProviderStatus")(
     });
   }
 
-  const models = providerModelsFromSettings(
-    getBuiltInClaudeModelsForVersion(parsedVersion),
-    claudeSettings.customModels,
-    DEFAULT_CLAUDE_MODEL_CAPABILITIES,
-  );
-  const versionUpgradeMessage = supportsClaudeFable5(parsedVersion)
+  const models = versionedModels;
+  const versionUpgradeMessage = supportsClaudeOpus5(parsedVersion)
     ? undefined
-    : supportsClaudeOpus48(parsedVersion)
-      ? formatClaudeFable5UpgradeMessage(parsedVersion)
+    : supportsClaudeFable5(parsedVersion)
+      ? formatClaudeOpus5UpgradeMessage(parsedVersion)
       : supportsClaudeOpus47(parsedVersion)
-        ? formatClaudeOpus48UpgradeMessage(parsedVersion)
+        ? formatClaudeFable5UpgradeMessage(parsedVersion)
         : formatClaudeOpus47UpgradeMessage(parsedVersion);
 
   const capabilities = resolveCapabilities
@@ -862,7 +871,7 @@ export const makePendingClaudeProvider = (
   Effect.gen(function* () {
     const checkedAt = yield* nowIso;
     const models = providerModelsFromSettings(
-      BUILT_IN_MODELS,
+      getBuiltInClaudeModelsForVersion(null),
       claudeSettings.customModels,
       DEFAULT_CLAUDE_MODEL_CAPABILITIES,
     );