feat: prioritize claude-opus-4-6 over claude-opus-4-5 in anthropic fallback chains

Add claude-opus-4-6 as the first anthropic provider entry before
claude-opus-4-5 across all agent and category fallback chains.
Also add high variant mapping for think-mode switcher.

src/agents/utils.test.ts

@@ -91,7 +91,7 @@ describe("createBuiltinAgents with model overrides", () => {
 
       // #then
       expect(agents.sisyphus).toBeDefined()
-      expect(agents.sisyphus.model).toBe("anthropic/claude-opus-4-5")
+      expect(agents.sisyphus.model).toBe("anthropic/claude-opus-4-6")
     } finally {
       cacheSpy.mockRestore()
       fetchSpy.mockRestore()
@@ -345,7 +345,7 @@ describe("createBuiltinAgents with requiresAnyModel gating (sisyphus)", () => {
 
       // #then
       expect(agents.sisyphus).toBeDefined()
-      expect(agents.sisyphus.model).toBe("anthropic/claude-opus-4-5")
+      expect(agents.sisyphus.model).toBe("anthropic/claude-opus-4-6")
     } finally {
       cacheSpy.mockRestore()
       fetchSpy.mockRestore()

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

@@ -75,26 +75,26 @@ exports[`generateModelConfig single native provider uses Claude models when only
       "model": "anthropic/claude-sonnet-4-5",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "multimodal-looker": {
       "model": "anthropic/claude-haiku-4-5",
     },
     "oracle": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -103,7 +103,7 @@ exports[`generateModelConfig single native provider uses Claude models when only
       "model": "anthropic/claude-haiku-4-5",
     },
     "ultrabrain": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "unspecified-high": {
@@ -113,7 +113,7 @@ exports[`generateModelConfig single native provider uses Claude models when only
       "model": "anthropic/claude-sonnet-4-5",
     },
     "visual-engineering": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "writing": {
@@ -137,26 +137,26 @@ exports[`generateModelConfig single native provider uses Claude models with isMa
       "model": "anthropic/claude-sonnet-4-5",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "multimodal-looker": {
       "model": "anthropic/claude-haiku-4-5",
     },
     "oracle": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -165,18 +165,18 @@ exports[`generateModelConfig single native provider uses Claude models with isMa
       "model": "anthropic/claude-haiku-4-5",
     },
     "ultrabrain": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "unspecified-high": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "unspecified-low": {
       "model": "anthropic/claude-sonnet-4-5",
     },
     "visual-engineering": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "writing": {
@@ -458,7 +458,7 @@ exports[`generateModelConfig all native providers uses preferred models from fal
       "model": "anthropic/claude-sonnet-4-5",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
@@ -473,11 +473,11 @@ exports[`generateModelConfig all native providers uses preferred models from fal
       "variant": "high",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -531,7 +531,7 @@ exports[`generateModelConfig all native providers uses preferred models with isM
       "model": "anthropic/claude-sonnet-4-5",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
@@ -546,11 +546,11 @@ exports[`generateModelConfig all native providers uses preferred models with isM
       "variant": "high",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -571,7 +571,7 @@ exports[`generateModelConfig all native providers uses preferred models with isM
       "variant": "xhigh",
     },
     "unspecified-high": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "unspecified-low": {
@@ -1009,7 +1009,7 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + OpenCode Zen
       "model": "opencode/glm-4.7-free",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
@@ -1024,11 +1024,11 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + OpenCode Zen
       "variant": "high",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -1151,26 +1151,26 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + ZAI combinat
       "model": "zai-coding-plan/glm-4.7",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "multimodal-looker": {
       "model": "zai-coding-plan/glm-4.6v",
     },
     "oracle": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -1179,7 +1179,7 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + ZAI combinat
       "model": "anthropic/claude-haiku-4-5",
     },
     "ultrabrain": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "unspecified-high": {
@@ -1189,7 +1189,7 @@ exports[`generateModelConfig mixed provider scenarios uses Claude + ZAI combinat
       "model": "anthropic/claude-sonnet-4-5",
     },
     "visual-engineering": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "writing": {
@@ -1213,11 +1213,11 @@ exports[`generateModelConfig mixed provider scenarios uses Gemini + Claude combi
       "model": "anthropic/claude-sonnet-4-5",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "multimodal-looker": {
@@ -1228,11 +1228,11 @@ exports[`generateModelConfig mixed provider scenarios uses Gemini + Claude combi
       "variant": "high",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -1355,7 +1355,7 @@ exports[`generateModelConfig mixed provider scenarios uses all providers togethe
       "model": "zai-coding-plan/glm-4.7",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
@@ -1370,11 +1370,11 @@ exports[`generateModelConfig mixed provider scenarios uses all providers togethe
       "variant": "high",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -1428,7 +1428,7 @@ exports[`generateModelConfig mixed provider scenarios uses all providers with is
       "model": "zai-coding-plan/glm-4.7",
     },
     "metis": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "momus": {
@@ -1443,11 +1443,11 @@ exports[`generateModelConfig mixed provider scenarios uses all providers with is
       "variant": "high",
     },
     "prometheus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "sisyphus": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
   },
@@ -1468,7 +1468,7 @@ exports[`generateModelConfig mixed provider scenarios uses all providers with is
       "variant": "xhigh",
     },
     "unspecified-high": {
-      "model": "anthropic/claude-opus-4-5",
+      "model": "anthropic/claude-opus-4-6",
       "variant": "max",
     },
     "unspecified-low": {

src/cli/config-manager.test.ts

@@ -259,7 +259,7 @@ describe("generateOmoConfig - model fallback system", () => {
     // #then Sisyphus uses Claude (OR logic - at least one provider available)
     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-4-5")
+    expect((result.agents as Record<string, { model: string }>).sisyphus.model).toBe("anthropic/claude-opus-4-6")
   })
 
   test("generates native opus models when Claude max20 subscription", () => {
@@ -279,7 +279,7 @@ describe("generateOmoConfig - model fallback system", () => {
     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-4-5")
+    expect((result.agents as Record<string, { model: string }>).sisyphus.model).toBe("anthropic/claude-opus-4-6")
   })
 
   test("uses github-copilot sonnet fallback when only copilot available", () => {
@@ -342,7 +342,7 @@ describe("generateOmoConfig - model fallback system", () => {
     // #then librarian should use zai-coding-plan/glm-4.7
     expect((result.agents as Record<string, { model: string }>).librarian.model).toBe("zai-coding-plan/glm-4.7")
     // #then Sisyphus uses Claude (OR logic)
-    expect((result.agents as Record<string, { model: string }>).sisyphus.model).toBe("anthropic/claude-opus-4-5")
+    expect((result.agents as Record<string, { model: string }>).sisyphus.model).toBe("anthropic/claude-opus-4-6")
   })
 
   test("uses native OpenAI models when only ChatGPT available", () => {

src/cli/doctor/checks/model-resolution.test.ts

@@ -14,9 +14,8 @@ describe("model-resolution check", () => {
       // then: Should have agent entries
       const sisyphus = info.agents.find((a) => a.name === "sisyphus")
       expect(sisyphus).toBeDefined()
-      expect(sisyphus!.requirement.fallbackChain[0]?.model).toBe("claude-opus-4-5")
+      expect(sisyphus!.requirement.fallbackChain[0]?.model).toBe("claude-opus-4-6")
       expect(sisyphus!.requirement.fallbackChain[0]?.providers).toContain("anthropic")
-      expect(sisyphus!.requirement.fallbackChain[0]?.providers).toContain("github-copilot")
     })
 
     it("returns category requirements with provider chains", async () => {

src/cli/model-fallback.test.ts

@@ -376,7 +376,7 @@ describe("generateModelConfig", () => {
       const result = generateModelConfig(config)
 
       // #then
-      expect(result.agents?.sisyphus?.model).toBe("anthropic/claude-opus-4-5")
+      expect(result.agents?.sisyphus?.model).toBe("anthropic/claude-opus-4-6")
     })
 
     test("Sisyphus is created when multiple fallback providers are available", () => {
@@ -393,7 +393,7 @@ describe("generateModelConfig", () => {
       const result = generateModelConfig(config)
 
       // #then
-      expect(result.agents?.sisyphus?.model).toBe("anthropic/claude-opus-4-5")
+      expect(result.agents?.sisyphus?.model).toBe("anthropic/claude-opus-4-6")
     })
 
     test("Sisyphus is omitted when no fallback provider is available (OpenAI not in chain)", () => {

src/hooks/think-mode/switcher.test.ts

@@ -141,6 +141,14 @@ describe("think-mode switcher", () => {
         expect(variant).toBe("claude-opus-4-5-high")
       })
 
+      it("should handle claude-opus-4-6 high variant", () => {
+        // given a Claude Opus 4.6 model ID
+        const variant = getHighVariant("claude-opus-4-6")
+
+        // then should return high variant
+        expect(variant).toBe("claude-opus-4-6-high")
+      })
+
       it("should handle dots in GPT version numbers", () => {
         // given a GPT model ID with dot format (gpt-5.2)
         const variant = getHighVariant("gpt-5.2")

src/hooks/think-mode/switcher.ts

@@ -88,6 +88,7 @@ function resolveProvider(providerID: string, modelID: string): string {
 const HIGH_VARIANT_MAP: Record<string, string> = {
   // Claude
   "claude-sonnet-4-5": "claude-sonnet-4-5-high",
+  "claude-opus-4-6": "claude-opus-4-6-high",
   "claude-opus-4-5": "claude-opus-4-5-high",
    // Gemini
    "gemini-3-pro": "gemini-3-pro-high",

src/shared/model-requirements.test.ts

@@ -23,23 +23,28 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(primary.variant).toBe("high")
   })
 
-  test("sisyphus has valid fallbackChain with claude-opus-4-5 as primary and requiresAnyModel", () => {
+  test("sisyphus has claude-opus-4-6 as primary before claude-opus-4-5 and requiresAnyModel", () => {
     // #given - sisyphus agent requirement
     const sisyphus = AGENT_MODEL_REQUIREMENTS["sisyphus"]
 
     // #when - accessing Sisyphus requirement
-    // #then - fallbackChain exists with claude-opus-4-5 as first entry, glm-4.7-free as last
+    // #then - fallbackChain has claude-opus-4-6 first, claude-opus-4-5 second, glm-4.7-free last
     expect(sisyphus).toBeDefined()
     expect(sisyphus.fallbackChain).toBeArray()
-    expect(sisyphus.fallbackChain).toHaveLength(5)
+    expect(sisyphus.fallbackChain).toHaveLength(6)
     expect(sisyphus.requiresAnyModel).toBe(true)
 
     const primary = sisyphus.fallbackChain[0]
-    expect(primary.providers[0]).toBe("anthropic")
+    expect(primary.providers).toEqual(["anthropic"])
-    expect(primary.model).toBe("claude-opus-4-5")
+    expect(primary.model).toBe("claude-opus-4-6")
     expect(primary.variant).toBe("max")
 
-    const last = sisyphus.fallbackChain[4]
+    const secondary = sisyphus.fallbackChain[1]
+    expect(secondary.providers[0]).toBe("anthropic")
+    expect(secondary.model).toBe("claude-opus-4-5")
+    expect(secondary.variant).toBe("max")
+
+    const last = sisyphus.fallbackChain[5]
     expect(last.providers[0]).toBe("opencode")
     expect(last.model).toBe("glm-4.7-free")
   })
@@ -98,36 +103,46 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(primary.model).toBe("gemini-3-flash")
   })
 
-  test("prometheus has valid fallbackChain with claude-opus-4-5 as primary", () => {
+  test("prometheus has claude-opus-4-6 as primary before claude-opus-4-5", () => {
-    // given - prometheus agent requirement
+    // #given - prometheus agent requirement
     const prometheus = AGENT_MODEL_REQUIREMENTS["prometheus"]
 
-    // when - accessing Prometheus requirement
+    // #when - accessing Prometheus requirement
-    // then - fallbackChain exists with claude-opus-4-5 as first entry
+    // #then - claude-opus-4-6 is first, claude-opus-4-5 is second
     expect(prometheus).toBeDefined()
     expect(prometheus.fallbackChain).toBeArray()
-    expect(prometheus.fallbackChain.length).toBeGreaterThan(0)
+    expect(prometheus.fallbackChain.length).toBeGreaterThan(1)
 
     const primary = prometheus.fallbackChain[0]
-    expect(primary.model).toBe("claude-opus-4-5")
+    expect(primary.model).toBe("claude-opus-4-6")
-    expect(primary.providers[0]).toBe("anthropic")
+    expect(primary.providers).toEqual(["anthropic"])
     expect(primary.variant).toBe("max")
+
+    const secondary = prometheus.fallbackChain[1]
+    expect(secondary.model).toBe("claude-opus-4-5")
+    expect(secondary.providers[0]).toBe("anthropic")
+    expect(secondary.variant).toBe("max")
   })
 
-  test("metis has valid fallbackChain with claude-opus-4-5 as primary", () => {
+  test("metis has claude-opus-4-6 as primary before claude-opus-4-5", () => {
-    // given - metis agent requirement
+    // #given - metis agent requirement
     const metis = AGENT_MODEL_REQUIREMENTS["metis"]
 
-    // when - accessing Metis requirement
+    // #when - accessing Metis requirement
-    // then - fallbackChain exists with claude-opus-4-5 as first entry
+    // #then - claude-opus-4-6 is first, claude-opus-4-5 is second
     expect(metis).toBeDefined()
     expect(metis.fallbackChain).toBeArray()
-    expect(metis.fallbackChain.length).toBeGreaterThan(0)
+    expect(metis.fallbackChain.length).toBeGreaterThan(1)
 
     const primary = metis.fallbackChain[0]
-    expect(primary.model).toBe("claude-opus-4-5")
+    expect(primary.model).toBe("claude-opus-4-6")
-    expect(primary.providers[0]).toBe("anthropic")
+    expect(primary.providers).toEqual(["anthropic"])
     expect(primary.variant).toBe("max")
+
+    const secondary = metis.fallbackChain[1]
+    expect(secondary.model).toBe("claude-opus-4-5")
+    expect(secondary.providers[0]).toBe("anthropic")
+    expect(secondary.variant).toBe("max")
   })
 
   test("momus has valid fallbackChain with gpt-5.2 as primary", () => {
@@ -285,20 +300,25 @@ describe("CATEGORY_MODEL_REQUIREMENTS", () => {
     expect(primary.providers[0]).toBe("anthropic")
   })
 
-  test("unspecified-high has valid fallbackChain with claude-opus-4-5 as primary", () => {
+  test("unspecified-high has claude-opus-4-6 as primary before claude-opus-4-5", () => {
-    // given - unspecified-high category requirement
+    // #given - unspecified-high category requirement
     const unspecifiedHigh = CATEGORY_MODEL_REQUIREMENTS["unspecified-high"]
 
-    // when - accessing unspecified-high requirement
+    // #when - accessing unspecified-high requirement
-    // then - fallbackChain exists with claude-opus-4-5 as first entry
+    // #then - claude-opus-4-6 is first, claude-opus-4-5 is second
     expect(unspecifiedHigh).toBeDefined()
     expect(unspecifiedHigh.fallbackChain).toBeArray()
-    expect(unspecifiedHigh.fallbackChain.length).toBeGreaterThan(0)
+    expect(unspecifiedHigh.fallbackChain.length).toBeGreaterThan(1)
 
     const primary = unspecifiedHigh.fallbackChain[0]
-    expect(primary.model).toBe("claude-opus-4-5")
+    expect(primary.model).toBe("claude-opus-4-6")
     expect(primary.variant).toBe("max")
-    expect(primary.providers[0]).toBe("anthropic")
+    expect(primary.providers).toEqual(["anthropic"])
+
+    const secondary = unspecifiedHigh.fallbackChain[1]
+    expect(secondary.model).toBe("claude-opus-4-5")
+    expect(secondary.variant).toBe("max")
+    expect(secondary.providers[0]).toBe("anthropic")
   })
 
   test("artistry has valid fallbackChain with gemini-3-pro as primary", () => {

src/shared/model-requirements.ts

@@ -14,6 +14,7 @@ export type ModelRequirement = {
 export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   sisyphus: {
     fallbackChain: [
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["opencode"], model: "kimi-k2.5-free" },
@@ -32,6 +33,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "high" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "high" },
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
     ],
   },
@@ -62,6 +64,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   prometheus: {
     fallbackChain: [
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["opencode"], model: "kimi-k2.5-free" },
@@ -71,6 +74,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   metis: {
     fallbackChain: [
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["opencode"], model: "kimi-k2.5-free" },
@@ -81,6 +85,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   momus: {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "medium" },
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "high" },
     ],
@@ -100,6 +105,7 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   "visual-engineering": {
     fallbackChain: [
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro" },
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["zai-coding-plan"], model: "glm-4.7" },
     ],
@@ -108,12 +114,14 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2-codex", variant: "xhigh" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "high" },
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
     ],
   },
   deep: {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2-codex", variant: "medium" },
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "high" },
     ],
@@ -122,6 +130,7 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   artistry: {
     fallbackChain: [
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "high" },
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2" },
     ],
@@ -143,6 +152,7 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   "unspecified-high": {
     fallbackChain: [
+      { providers: ["anthropic"], model: "claude-opus-4-6", variant: "max" },
       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "high" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro" },