feat(cli): use sonnet-4-6 with ultrawork opus-4-6 for non-max20 Claude subscribers

docs/guide/installation.md

@@ -68,6 +68,15 @@ Ask the user these questions to determine CLI options:
 
 **Provider Priority**: Native (anthropic/, openai/, google/) > GitHub Copilot > OpenCode Zen > Z.ai Coding Plan
 
+#### Claude Subscription Model Assignments
+
+| Subscription | Sisyphus (Daily) | Ultrawork Mode |
+| ------------ | ---------------- | -------------- |
+| **max20** | `anthropic/claude-opus-4-6` (max) | Already on Opus — no override |
+| **standard** | `anthropic/claude-sonnet-4-6` (max) | `anthropic/claude-opus-4-6` (max) |
+
+Standard Claude subscribers use Sonnet 4.6 for daily driving and automatically switch to Opus 4.6 when ultrawork mode is activated (by typing `ultrawork` or `ulw`).
+
 MUST STRONGLY WARNING, WHEN USER SAID THEY DON'T HAVE CLAUDE SUBSCRIPTION, SISYPHUS AGENT MIGHT NOT WORK IDEALLY.
 
 ### Step 1: Install OpenCode (if not installed)

src/cli/__snapshots__/model-fallback.test.ts.snap

@@ -94,7 +94,11 @@ exports[`generateModelConfig single native provider uses Claude models when only
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-sonnet-4-6",
+      "ultrawork": {
+        "model": "anthropic/claude-opus-4-6",
+        "variant": "max",
+      },
       "variant": "max",
     },
   },
@@ -479,7 +483,11 @@ exports[`generateModelConfig all native providers uses preferred models from fal
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-sonnet-4-6",
+      "ultrawork": {
+        "model": "anthropic/claude-opus-4-6",
+        "variant": "max",
+      },
       "variant": "max",
     },
   },
@@ -1036,7 +1044,11 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + OpenCode Zen
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-sonnet-4-6",
+      "ultrawork": {
+        "model": "anthropic/claude-opus-4-6",
+        "variant": "max",
+      },
       "variant": "max",
     },
   },
@@ -1180,7 +1192,11 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + ZAI combinat
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-sonnet-4-6",
+      "ultrawork": {
+        "model": "anthropic/claude-opus-4-6",
+        "variant": "max",
+      },
       "variant": "max",
     },
   },
@@ -1241,7 +1257,11 @@ exports[`generateModelConfig mixed provider scenarios uses Gemini + Claude combi
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-sonnet-4-6",
+      "ultrawork": {
+        "model": "anthropic/claude-opus-4-6",
+        "variant": "max",
+      },
       "variant": "max",
     },
   },
@@ -1385,7 +1405,11 @@ exports[`generateModelConfig mixed provider scenarios uses all providers togethe
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-6",
+      "model": "anthropic/claude-sonnet-4-6",
+      "ultrawork": {
+        "model": "anthropic/claude-opus-4-6",
+        "variant": "max",
+      },
       "variant": "max",
     },
   },

src/cli/config-manager.test.ts

@@ -240,7 +240,7 @@ describe("config-manager ANTIGRAVITY_PROVIDER_CONFIG", () => {
 })
 
 describe("generateOmoConfig - model fallback system", () => {
-  test("generates native sonnet models when Claude standard subscription", () => {
+  test("generates sonnet model with ultrawork opus for Claude standard subscription", () => {
     // #given user has Claude standard subscription (not max20)
     const config: InstallConfig = {
       hasClaude: true,
@@ -256,13 +256,15 @@ describe("generateOmoConfig - model fallback system", () => {
     // #when generating config
     const result = generateOmoConfig(config)
 
-    // #then Sisyphus uses Claude (OR logic - at least one provider available)
+    // #then Sisyphus uses sonnet for daily driving with ultrawork opus override
+    const sisyphus = (result.agents as Record<string, { model: string; variant?: string; ultrawork?: { model: string; variant?: string } }>).sisyphus
     expect(result.$schema).toBe("https://raw.githubusercontent.com/code-yeongyu/oh-my-opencode/master/assets/oh-my-opencode.schema.json")
-    expect(result.agents).toBeDefined()
-    expect((result.agents as Record<string, { model: string }>).sisyphus.model).toBe("anthropic/claude-opus-4-6")
+    expect(sisyphus.model).toBe("anthropic/claude-sonnet-4-6")
+    expect(sisyphus.variant).toBe("max")
+    expect(sisyphus.ultrawork).toEqual({ model: "anthropic/claude-opus-4-6", variant: "max" })
   })
 
-  test("generates native opus models when Claude max20 subscription", () => {
+  test("generates native opus models without ultrawork when Claude max20 subscription", () => {
     // #given user has Claude max20 subscription
     const config: InstallConfig = {
       hasClaude: true,
@@ -278,8 +280,10 @@ describe("generateOmoConfig - model fallback system", () => {
     // #when generating config
     const result = generateOmoConfig(config)
 
-    // #then Sisyphus uses Claude (OR logic - at least one provider available)
-    expect((result.agents as Record<string, { model: string }>).sisyphus.model).toBe("anthropic/claude-opus-4-6")
+    // #then Sisyphus uses opus directly, no ultrawork override needed
+    const sisyphus = (result.agents as Record<string, { model: string; ultrawork?: unknown }>).sisyphus
+    expect(sisyphus.model).toBe("anthropic/claude-opus-4-6")
+    expect(sisyphus.ultrawork).toBeUndefined()
   })
 
   test("uses github-copilot sonnet fallback when only copilot available", () => {

src/cli/model-fallback-types.ts

@@ -11,9 +11,15 @@ export interface ProviderAvailability {
 	isMaxPlan: boolean
 }
 
+export interface UltraworkConfig {
+	model: string
+	variant?: string
+}
+
 export interface AgentConfig {
 	model: string
 	variant?: string
+	ultrawork?: UltraworkConfig
 }
 
 export interface CategoryConfig {

src/cli/model-fallback.ts

@@ -75,6 +75,16 @@ export function generateModelConfig(config: InstallConfig): GeneratedOmoConfig {
       if (req.requiresAnyModel && !isAnyFallbackEntryAvailable(fallbackChain, avail)) {
         continue
       }
+
+      if (avail.native.claude && !avail.isMaxPlan) {
+        agents[role] = {
+          model: "anthropic/claude-sonnet-4-6",
+          variant: "max",
+          ultrawork: { model: "anthropic/claude-opus-4-6", variant: "max" },
+        }
+        continue
+      }
+
       const resolved = resolveModelFromChain(fallbackChain, avail)
       if (resolved) {
         const variant = resolved.variant ?? req.variant