diff --git a/src/shared/agent-variant.test.ts b/src/shared/agent-variant.test.ts
index 16c46e9134..401f4831b9 100644
--- a/src/shared/agent-variant.test.ts
+++ b/src/shared/agent-variant.test.ts
@@ -211,4 +211,40 @@ describe("resolveVariantForModel", () => {
     // then
     expect(variant).toBe("max")
   })
+
+  test("returns thinking variant for github-copilot provider with claude-opus-4-5", () => {
+    // #given - github-copilot doesn't support "max" variant, only "standard" and "thinking"
+    const config = {} as OhMyOpenCodeConfig
+    const model = { providerID: "github-copilot", modelID: "claude-opus-4-5" }
+
+    // #when
+    const variant = resolveVariantForModel(config, "sisyphus", model)
+
+    // #then - should return "thinking" instead of "max"
+    expect(variant).toBe("thinking")
+  })
+
+  test("returns thinking variant for github-copilot claude in oracle agent", () => {
+    // #given - oracle agent with github-copilot provider
+    const config = {} as OhMyOpenCodeConfig
+    const model = { providerID: "github-copilot", modelID: "claude-opus-4-5" }
+
+    // #when
+    const variant = resolveVariantForModel(config, "oracle", model)
+
+    // #then - copilot claude gets "thinking" variant
+    expect(variant).toBe("thinking")
+  })
+
+  test("returns high variant for github-copilot gemini-3-pro in oracle agent", () => {
+    // #given - oracle agent with github-copilot provider and gemini model
+    const config = {} as OhMyOpenCodeConfig
+    const model = { providerID: "github-copilot", modelID: "gemini-3-pro" }
+
+    // #when
+    const variant = resolveVariantForModel(config, "oracle", model)
+
+    // #then - copilot gemini gets "high" variant (not "max")
+    expect(variant).toBe("high")
+  })
 })
diff --git a/src/shared/model-requirements.test.ts b/src/shared/model-requirements.test.ts
index 05d1d5568c..d3d4a21d8e 100644
--- a/src/shared/model-requirements.test.ts
+++ b/src/shared/model-requirements.test.ts
@@ -28,18 +28,25 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     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 exists with claude-opus-4-5 (anthropic) as first entry, glm-4.7-free as last
     expect(sisyphus).toBeDefined()
     expect(sisyphus.fallbackChain).toBeArray()
-    expect(sisyphus.fallbackChain).toHaveLength(5)
+    expect(sisyphus.fallbackChain).toHaveLength(6)
     expect(sisyphus.requiresAnyModel).toBe(true)
 
+    // First entry: anthropic/opencode gets "max" variant
     const primary = sisyphus.fallbackChain[0]
     expect(primary.providers[0]).toBe("anthropic")
     expect(primary.model).toBe("claude-opus-4-5")
     expect(primary.variant).toBe("max")
 
-    const last = sisyphus.fallbackChain[4]
+    // Second entry: github-copilot gets "thinking" variant (copilot doesn't support "max")
+    const copilotEntry = sisyphus.fallbackChain[1]
+    expect(copilotEntry.providers[0]).toBe("github-copilot")
+    expect(copilotEntry.model).toBe("claude-opus-4-5")
+    expect(copilotEntry.variant).toBe("thinking")
+
+    const last = sisyphus.fallbackChain[5]
     expect(last.providers[0]).toBe("opencode")
     expect(last.model).toBe("glm-4.7-free")
   })
diff --git a/src/shared/model-requirements.ts b/src/shared/model-requirements.ts
index 8b5eabc116..966200d997 100644
--- a/src/shared/model-requirements.ts
+++ b/src/shared/model-requirements.ts
@@ -14,7 +14,8 @@ export type ModelRequirement = {
 export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   sisyphus: {
     fallbackChain: [
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
       { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["opencode"], model: "kimi-k2.5-free" },
       { providers: ["zai-coding-plan"], model: "glm-4.7" },
@@ -31,8 +32,10 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   oracle: {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "high" },
-      { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["google", "opencode"], model: "gemini-3-pro", variant: "max" },
+      { providers: ["github-copilot"], model: "gemini-3-pro", variant: "high" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
     ],
   },
    librarian: {
@@ -62,7 +65,8 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   prometheus: {
     fallbackChain: [
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
       { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["opencode"], model: "kimi-k2.5-free" },
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "high" },
@@ -71,18 +75,22 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   metis: {
     fallbackChain: [
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
       { providers: ["kimi-for-coding"], model: "k2p5" },
       { providers: ["opencode"], model: "kimi-k2.5-free" },
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "high" },
-      { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
+      { providers: ["google", "opencode"], model: "gemini-3-pro", variant: "max" },
+      { providers: ["github-copilot"], model: "gemini-3-pro", variant: "high" },
     ],
   },
   momus: {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "medium" },
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
-      { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
+      { providers: ["google", "opencode"], model: "gemini-3-pro", variant: "max" },
+      { providers: ["github-copilot"], model: "gemini-3-pro", variant: "high" },
     ],
   },
   atlas: {
@@ -100,29 +108,36 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   "visual-engineering": {
     fallbackChain: [
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro" },
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
       { providers: ["zai-coding-plan"], model: "glm-4.7" },
     ],
   },
   ultrabrain: {
     fallbackChain: [
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2-codex", variant: "xhigh" },
-      { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["google", "opencode"], model: "gemini-3-pro", variant: "max" },
+      { providers: ["github-copilot"], model: "gemini-3-pro", variant: "high" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
     ],
   },
    deep: {
      fallbackChain: [
        { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2-codex", variant: "medium" },
-       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
-       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
+       { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+       { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
+       { providers: ["google", "opencode"], model: "gemini-3-pro", variant: "max" },
+       { providers: ["github-copilot"], model: "gemini-3-pro", variant: "high" },
      ],
      requiresModel: "gpt-5.2-codex",
    },
    artistry: {
      fallbackChain: [
-       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro", variant: "max" },
-       { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+       { providers: ["google", "opencode"], model: "gemini-3-pro", variant: "max" },
+       { providers: ["github-copilot"], model: "gemini-3-pro", variant: "high" },
+       { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+       { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
        { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2" },
      ],
      requiresModel: "gemini-3-pro",
@@ -143,7 +158,8 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   "unspecified-high": {
     fallbackChain: [
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["anthropic", "opencode"], model: "claude-opus-4-5", variant: "max" },
+      { providers: ["github-copilot"], model: "claude-opus-4-5", variant: "thinking" },
       { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.2", variant: "high" },
       { providers: ["google", "github-copilot", "opencode"], model: "gemini-3-pro" },
     ],