Update OpenAI defaults to GPT-5.5

src/agents/AGENTS.md

@@ -10,15 +10,15 @@ Agent factories following `createXXXAgent(model) → AgentConfig` pattern. Each
 
 | Agent | Model | Temp | Mode | Fallback Chain | Purpose |
 |-------|-------|------|------|----------------|---------|
-| **Sisyphus** | claude-opus-4-7 max | 0.1 | all | k2p5 -> kimi-k2.5 -> gpt-5.4 medium -> glm-5 -> big-pickle | Main orchestrator, plans + delegates |
+| **Sisyphus** | claude-opus-4-7 max | 0.1 | all | k2p5 -> kimi-k2.5 -> gpt-5.5 medium -> glm-5 -> big-pickle | Main orchestrator, plans + delegates |
-| **Hephaestus** | gpt-5.4 medium | 0.1 | all | — | Autonomous deep worker |
+| **Hephaestus** | gpt-5.5 medium | 0.1 | all | — | Autonomous deep worker |
-| **Oracle** | gpt-5.4 high | 0.1 | subagent | gemini-3.1-pro high -> claude-opus-4-7 max | Read-only consultation |
+| **Oracle** | gpt-5.5 high | 0.1 | subagent | gemini-3.1-pro high -> claude-opus-4-7 max | Read-only consultation |
 | **Librarian** | gpt-5.4-mini-fast | 0.1 | subagent | minimax-m2.7-highspeed -> minimax-m2.7 -> claude-haiku-4-5 -> gpt-5.4-nano | External docs/code search |
 | **Explore** | gpt-5.4-mini-fast | 0.1 | subagent | minimax-m2.7-highspeed -> minimax-m2.7 -> claude-haiku-4-5 -> gpt-5.4-nano | Contextual grep |
 | **Multimodal-Looker** | gpt-5.3-codex medium | 0.1 | subagent | k2p5 -> gemini-3-flash -> glm-4.6v -> gpt-5-nano | PDF/image analysis |
-| **Metis** | claude-opus-4-7 max | **0.3** | subagent | gpt-5.4 high -> gemini-3.1-pro high | Pre-planning consultant |
+| **Metis** | claude-opus-4-7 max | **0.3** | subagent | gpt-5.5 high -> gemini-3.1-pro high | Pre-planning consultant |
-| **Momus** | gpt-5.4 xhigh | 0.1 | subagent | claude-opus-4-7 max -> gemini-3.1-pro high | Plan reviewer |
+| **Momus** | gpt-5.5 xhigh | 0.1 | subagent | claude-opus-4-7 max -> gemini-3.1-pro high | Plan reviewer |
-| **Atlas** | claude-sonnet-4-6 | 0.1 | primary | gpt-5.4 medium | Todo-list orchestrator |
+| **Atlas** | claude-sonnet-4-6 | 0.1 | primary | gpt-5.5 medium | Todo-list orchestrator |
 | **Prometheus** | claude-opus-4-7 max | 0.1 | — | internal planner | Strategic planner (internal) |
 | **Sisyphus-Junior** | claude-sonnet-4-6 | 0.1 | all | user-configurable | Category-spawned executor |
 

src/agents/hephaestus/AGENTS.md

@@ -4,7 +4,7 @@
 
 ## OVERVIEW
 
-6 files. Hephaestus agent -- autonomous deep worker powered by GPT-5.4. Goal-oriented: give it objectives, not step-by-step instructions. "The Legitimate Craftsman."
+6 files. Hephaestus agent -- autonomous deep worker powered by GPT-5.5. Goal-oriented: give it objectives, not step-by-step instructions. "The Legitimate Craftsman."
 
 ## FILES
 
@@ -29,6 +29,7 @@
 
 | Model | Prompt Source | Optimizations |
 |-------|-------------|---------------|
+| gpt-5.5 | `gpt-5-5.ts` | GPT-5.5-tuned prompt architecture |
 | gpt-5.4 | `gpt-5-4.ts` | XML-tagged blocks, 8 sections |
 | gpt-5.3-codex | `gpt-5-3-codex.ts` | Task discipline, 549 LOC prompt |
 | Other GPT | `gpt.ts` | Base prompt, 507 LOC |

src/cli/cli-program.ts

@@ -94,7 +94,7 @@ Examples:
   $ bunx oh-my-opencode run --on-complete "notify-send Done" "Fix the bug"
   $ bunx oh-my-opencode run --session-id ses_abc123 "Continue the work"
   $ bunx oh-my-opencode run --model anthropic/claude-sonnet-4 "Fix the bug"
-  $ bunx oh-my-opencode run --agent Sisyphus --model openai/gpt-5.4 "Implement feature X"
+  $ bunx oh-my-opencode run --agent Sisyphus --model openai/gpt-5.5 "Implement feature X"
 
 Agent resolution order:
   1) --agent flag

src/cli/model-fallback.test.ts

@@ -401,7 +401,7 @@ describe("generateModelConfig", () => {
       expect(result.agents?.sisyphus?.model).toBe("anthropic/claude-opus-4-7")
     })
 
-    test("Sisyphus resolves to gpt-5.4 medium when only OpenAI is available", () => {
+    test("Sisyphus resolves to gpt-5.5 medium when only OpenAI is available", () => {
       // #given
       const config = createConfig({ hasOpenAI: true })
 
@@ -409,7 +409,7 @@ describe("generateModelConfig", () => {
       const result = generateModelConfig(config)
 
       // #then
-      expect(result.agents?.sisyphus?.model).toBe("openai/gpt-5.4")
+      expect(result.agents?.sisyphus?.model).toBe("openai/gpt-5.5")
       expect(result.agents?.sisyphus?.variant).toBe("medium")
     })
   })
@@ -423,7 +423,7 @@ describe("generateModelConfig", () => {
       const result = generateModelConfig(config)
 
       // #then
-      expect(result.agents?.atlas?.model).toBe("openai/gpt-5.4")
+      expect(result.agents?.atlas?.model).toBe("openai/gpt-5.5")
       expect(result.agents?.atlas?.variant).toBe("medium")
     })
 
@@ -435,7 +435,7 @@ describe("generateModelConfig", () => {
       const result = generateModelConfig(config)
 
       // #then
-      expect(result.agents?.metis?.model).toBe("openai/gpt-5.4")
+      expect(result.agents?.metis?.model).toBe("openai/gpt-5.5")
       expect(result.agents?.metis?.variant).toBe("high")
     })
 
@@ -447,7 +447,7 @@ describe("generateModelConfig", () => {
       const result = generateModelConfig(config)
 
       // #then
-      expect(result.agents?.["sisyphus-junior"]?.model).toBe("openai/gpt-5.4")
+      expect(result.agents?.["sisyphus-junior"]?.model).toBe("openai/gpt-5.5")
       expect(result.agents?.["sisyphus-junior"]?.variant).toBe("medium")
     })
   })

src/cli/openai-only-model-catalog.test.ts

@@ -40,10 +40,10 @@ describe("generateModelConfig OpenAI-only model catalog", () => {
     const result = generateModelConfig(config)
 
     // #then
-    expect(result.categories?.artistry).toEqual({ model: "openai/gpt-5.4", variant: "xhigh" })
+    expect(result.categories?.artistry).toEqual({ model: "openai/gpt-5.5", variant: "xhigh" })
     expect(result.categories?.quick).toEqual({ model: "openai/gpt-5.4-mini" })
-    expect(result.categories?.["visual-engineering"]).toEqual({ model: "openai/gpt-5.4", variant: "high" })
+    expect(result.categories?.["visual-engineering"]).toEqual({ model: "openai/gpt-5.5", variant: "high" })
-    expect(result.categories?.writing).toEqual({ model: "openai/gpt-5.4", variant: "medium" })
+    expect(result.categories?.writing).toEqual({ model: "openai/gpt-5.5", variant: "medium" })
   })
 
   test("does not apply OpenAI-only overrides when OpenCode Go is also available", () => {

src/cli/openai-only-model-catalog.ts

@@ -6,10 +6,10 @@ const OPENAI_ONLY_AGENT_OVERRIDES: Record<string, AgentConfig> = {
 }
 
 const OPENAI_ONLY_CATEGORY_OVERRIDES: Record<string, CategoryConfig> = {
-  artistry: { model: "openai/gpt-5.4", variant: "xhigh" },
+  artistry: { model: "openai/gpt-5.5", variant: "xhigh" },
   quick: { model: "openai/gpt-5.4-mini" },
-  "visual-engineering": { model: "openai/gpt-5.4", variant: "high" },
+  "visual-engineering": { model: "openai/gpt-5.5", variant: "high" },
-  writing: { model: "openai/gpt-5.4", variant: "medium" },
+  writing: { model: "openai/gpt-5.5", variant: "medium" },
 }
 
 export function isOpenAiOnlyAvailability(availability: ProviderAvailability): boolean {

src/cli/tui-install-prompts.ts

@@ -74,7 +74,7 @@ export async function promptInstallConfig(detected: DetectedConfig): Promise<Ins
     message: "Do you have access to OpenCode Zen (opencode/ models)?",
     options: [
       { value: "no", label: "No", hint: "Will use other configured providers" },
-      { value: "yes", label: "Yes", hint: "opencode/claude-opus-4-7, opencode/gpt-5.4, etc." },
+      { value: "yes", label: "Yes", hint: "opencode/claude-opus-4-7, opencode/gpt-5.5, etc." },
     ],
     initialValue: initial.opencodeZen,
   })

src/shared/model-requirements.test.ts

@@ -23,7 +23,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(primary.variant).toBe("high")
   })
 
-  test("sisyphus has claude-opus-4-7 as primary with k2p5, kimi-k2.5, gpt-5.4 medium fallbacks", () => {
+  test("sisyphus has claude-opus-4-7 as primary with k2p5, kimi-k2.5, gpt-5.5 medium fallbacks", () => {
     // #given - sisyphus agent requirement
     const sisyphus = AGENT_MODEL_REQUIREMENTS["sisyphus"]
 
@@ -50,10 +50,10 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     const fourth = sisyphus.fallbackChain[3]
     expect(fourth.model).toBe("kimi-k2.5")
 
-    const fifth = sisyphus.fallbackChain[4]
+	const fifth = sisyphus.fallbackChain[4]
-    expect(fifth.providers).toContain("openai")
+	expect(fifth.providers).toContain("openai")
-    expect(fifth.model).toBe("gpt-5.4")
+	expect(fifth.model).toBe("gpt-5.5")
-    expect(fifth.variant).toBe("medium")
+	expect(fifth.variant).toBe("medium")
 
     const sixth = sisyphus.fallbackChain[5]
     expect(sixth.providers[0]).toBe("zai-coding-plan")
@@ -125,19 +125,19 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(fifth.model).toBe("gpt-5.4-nano")
   })
 
-  test("multimodal-looker has valid fallbackChain with gpt-5.4 as primary", () => {
+  test("multimodal-looker has valid fallbackChain with gpt-5.5 as primary", () => {
     // given - multimodal-looker agent requirement
     const multimodalLooker = AGENT_MODEL_REQUIREMENTS["multimodal-looker"]
 
     // when - accessing multimodal-looker requirement
-    // then - fallbackChain: gpt-5.4 -> opencode-go/kimi-k2.5 -> glm-4.6v -> gpt-5-nano
+    // then - fallbackChain: gpt-5.5 -> opencode-go/kimi-k2.5 -> glm-4.6v -> gpt-5-nano
     expect(multimodalLooker).toBeDefined()
     expect(multimodalLooker.fallbackChain).toBeArray()
     expect(multimodalLooker.fallbackChain).toHaveLength(4)
 
     const primary = multimodalLooker.fallbackChain[0]
     expect(primary.providers).toEqual(["openai", "opencode", "vercel"])
-    expect(primary.model).toBe("gpt-5.4")
+    expect(primary.model).toBe("gpt-5.5")
     expect(primary.variant).toBe("medium")
 
     const secondary = multimodalLooker.fallbackChain[1]
@@ -186,23 +186,23 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     const openAiFallback = metis.fallbackChain.find((entry) => entry.providers.includes("openai"))
     expect(openAiFallback).toEqual({
       providers: ["openai", "github-copilot", "opencode", "vercel"],
-      model: "gpt-5.4",
+      model: "gpt-5.5",
       variant: "high",
     })
   })
 
-  test("momus has valid fallbackChain with gpt-5.4 as primary", () => {
+  test("momus has valid fallbackChain with gpt-5.5 as primary", () => {
     // given - momus agent requirement
     const momus = AGENT_MODEL_REQUIREMENTS["momus"]
 
     // when - accessing Momus requirement
-    // then - fallbackChain exists with gpt-5.4 as first entry, variant xhigh
+    // then - fallbackChain exists with gpt-5.5 as first entry, variant xhigh
     expect(momus).toBeDefined()
     expect(momus.fallbackChain).toBeArray()
     expect(momus.fallbackChain.length).toBeGreaterThan(0)
 
     const primary = momus.fallbackChain[0]
-    expect(primary.model).toBe("gpt-5.4")
+    expect(primary.model).toBe("gpt-5.5")
     expect(primary.variant).toBe("xhigh")
     expect(primary.providers[0]).toBe("openai")
   })
@@ -228,7 +228,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     const tertiary = atlas.fallbackChain[2]
     expect(tertiary).toEqual({
       providers: ["openai", "github-copilot", "opencode", "vercel"],
-      model: "gpt-5.4",
+      model: "gpt-5.5",
       variant: "medium",
     })
 
@@ -250,7 +250,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     // then
     expect(openAiFallback).toEqual({
       providers: ["openai", "github-copilot", "opencode", "vercel"],
-      model: "gpt-5.4",
+      model: "gpt-5.5",
       variant: "medium",
     })
     expect(openAiFallbackIndex).toBeGreaterThan(-1)
@@ -307,19 +307,19 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
 })
 
 describe("CATEGORY_MODEL_REQUIREMENTS", () => {
-  test("ultrabrain has valid fallbackChain with gpt-5.4 as primary", () => {
+  test("ultrabrain has valid fallbackChain with gpt-5.5 as primary", () => {
     // given - ultrabrain category requirement
     const ultrabrain = CATEGORY_MODEL_REQUIREMENTS["ultrabrain"]
 
     // when - accessing ultrabrain requirement
-    // then - fallbackChain exists with gpt-5.4 as first entry
+    // then - fallbackChain exists with gpt-5.5 as first entry
     expect(ultrabrain).toBeDefined()
     expect(ultrabrain.fallbackChain).toBeArray()
     expect(ultrabrain.fallbackChain.length).toBeGreaterThan(0)
 
     const primary = ultrabrain.fallbackChain[0]
     expect(primary.variant).toBe("xhigh")
-    expect(primary.model).toBe("gpt-5.4")
+    expect(primary.model).toBe("gpt-5.5")
     expect(primary.providers[0]).toBe("openai")
   })
 
@@ -406,12 +406,12 @@ describe("CATEGORY_MODEL_REQUIREMENTS", () => {
     expect(primary.providers[0]).toBe("anthropic")
   })
 
-  test("unspecified-high has claude-opus-4-7 as primary and gpt-5.4 as secondary", () => {
+  test("unspecified-high has claude-opus-4-7 as primary and gpt-5.5 as secondary", () => {
     // #given - unspecified-high category requirement
     const unspecifiedHigh = CATEGORY_MODEL_REQUIREMENTS["unspecified-high"]
 
     // #when - accessing unspecified-high requirement
-    // #then - claude-opus-4-7 is first and gpt-5.4 is second
+    // #then - claude-opus-4-7 is first and gpt-5.5 is second
     expect(unspecifiedHigh).toBeDefined()
     expect(unspecifiedHigh.fallbackChain).toBeArray()
     expect(unspecifiedHigh.fallbackChain.length).toBeGreaterThan(1)
@@ -422,7 +422,7 @@ describe("CATEGORY_MODEL_REQUIREMENTS", () => {
     expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode", "vercel"])
 
     const secondary = unspecifiedHigh.fallbackChain[1]
-    expect(secondary.model).toBe("gpt-5.4")
+    expect(secondary.model).toBe("gpt-5.5")
     expect(secondary.variant).toBe("high")
     expect(secondary.providers).toEqual(["openai", "github-copilot", "opencode", "vercel"])
   })
@@ -539,7 +539,7 @@ describe("ModelRequirement type", () => {
     const requirement: ModelRequirement = {
       fallbackChain: [
         { providers: ["anthropic", "github-copilot"], model: "claude-opus-4-7", variant: "max" },
-        { providers: ["openai", "github-copilot"], model: "gpt-5.4", variant: "high" },
+        { providers: ["openai", "github-copilot"], model: "gpt-5.5", variant: "high" },
       ],
     }
 
@@ -548,7 +548,7 @@ describe("ModelRequirement type", () => {
     expect(requirement.fallbackChain).toBeArray()
     expect(requirement.fallbackChain).toHaveLength(2)
     expect(requirement.fallbackChain[0].model).toBe("claude-opus-4-7")
-    expect(requirement.fallbackChain[1].model).toBe("gpt-5.4")
+    expect(requirement.fallbackChain[1].model).toBe("gpt-5.5")
   })
 
   test("ModelRequirement variant is optional", () => {

src/shared/model-requirements.ts

@@ -39,7 +39,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
         ],
         model: "kimi-k2.5",
       },
-      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5.4", variant: "medium" },
+      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5.5", variant: "medium" },
       { providers: ["zai-coding-plan", "opencode", "vercel"], model: "glm-5" },
       { providers: ["opencode"], model: "big-pickle" },
     ],
@@ -95,7 +95,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   "multimodal-looker": {
     fallbackChain: [
-      { providers: ["openai", "opencode", "vercel"], model: "gpt-5.4", variant: "medium" },
+      { providers: ["openai", "opencode", "vercel"], model: "gpt-5.5", variant: "medium" },
       { providers: ["opencode-go", "vercel"], model: "kimi-k2.5" },
       { providers: ["zai-coding-plan", "vercel"], model: "glm-4.6v" },
       { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5-nano" },
@@ -110,7 +110,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
       },
       {
         providers: ["openai", "github-copilot", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "high",
       },
       { providers: ["opencode-go", "vercel"], model: "glm-5" },
@@ -129,7 +129,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
       },
       {
         providers: ["openai", "github-copilot", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "high",
       },
       { providers: ["opencode-go", "vercel"], model: "glm-5" },
@@ -140,7 +140,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
     fallbackChain: [
       {
         providers: ["openai", "github-copilot", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "xhigh",
       },
       {
@@ -162,7 +162,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
       { providers: ["opencode-go", "vercel"], model: "kimi-k2.5" },
       {
         providers: ["openai", "github-copilot", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "medium",
       },
       { providers: ["opencode-go", "vercel"], model: "minimax-m2.7" },
@@ -174,7 +174,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
       { providers: ["opencode-go", "vercel"], model: "kimi-k2.5" },
       {
         providers: ["openai", "github-copilot", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "medium",
       },
       { providers: ["opencode-go", "vercel"], model: "minimax-m2.7" },
@@ -205,7 +205,7 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
     fallbackChain: [
       {
         providers: ["openai", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "xhigh",
       },
       {
@@ -252,7 +252,7 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
         model: "claude-opus-4-7",
         variant: "max",
       },
-      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5.4" },
+      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5.5" },
     ],
     requiresModel: "gemini-3.1-pro",
   },
@@ -302,7 +302,7 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
       },
       {
         providers: ["openai", "github-copilot", "opencode", "vercel"],
-        model: "gpt-5.4",
+        model: "gpt-5.5",
         variant: "high",
       },
       { providers: ["zai-coding-plan", "opencode", "vercel"], model: "glm-5" },

src/tools/AGENTS.md

@@ -92,8 +92,8 @@
 | Category | Model | Domain |
 |----------|-------|--------|
 | visual-engineering | gemini-3.1-pro high | Frontend, UI/UX |
-| ultrabrain | gpt-5.4 xhigh | Hard logic |
+| ultrabrain | gpt-5.5 xhigh | Hard logic |
-| deep | gpt-5.4 medium | Autonomous problem-solving |
+| deep | gpt-5.5 medium | Autonomous problem-solving |
 | artistry | gemini-3.1-pro high | Creative approaches |
 | quick | gpt-5.4-mini | Trivial tasks |
 | unspecified-low | claude-sonnet-4-6 | Moderate effort |

src/tools/delegate-task/openai-categories.ts

@@ -97,7 +97,7 @@ If your prompt lacks this structure, REWRITE IT before delegating.
 export const OPENAI_CATEGORIES: BuiltinCategoryDefinition[] = [
   {
     name: "ultrabrain",
-    config: { model: "openai/gpt-5.4", variant: "xhigh" },
+    config: { model: "openai/gpt-5.5", variant: "xhigh" },
     description: "Use ONLY for genuinely hard, logic-heavy tasks. Give clear goals only, not step-by-step instructions.",
     promptAppend: ULTRABRAIN_CATEGORY_PROMPT_APPEND,
   },

src/tools/delegate-task/tools.test.ts

@@ -33,8 +33,8 @@ const TEST_AVAILABLE_MODELS = new Set([
   "anthropic/claude-haiku-4-5",
   "google/gemini-3.1-pro",
   "google/gemini-3-flash",
+  "openai/gpt-5.4-mini",
   "openai/gpt-5.5",
-  "openai/gpt-5.4",
   "openai/gpt-5.3-codex",
 ])
 
@@ -69,7 +69,7 @@ describe("sisyphus-task", () => {
       models: {
         anthropic: ["claude-opus-4-7", "claude-sonnet-4-6", "claude-haiku-4-5"],
         google: ["gemini-3.1-pro", "gemini-3-flash"],
-        openai: ["gpt-5.5", "gpt-5.4", "gpt-5.3-codex"],
+        openai: ["gpt-5.5", "gpt-5.4-mini", "gpt-5.3-codex"],
       },
       connected: ["anthropic", "google", "openai"],
       updatedAt: "2026-01-01T00:00:00.000Z",
@@ -99,7 +99,7 @@ describe("sisyphus-task", () => {
 
       // when / #then
       expect(category).toBeDefined()
-      expect(category.model).toBe("openai/gpt-5.4")
+      expect(category.model).toBe("openai/gpt-5.5")
       expect(category.variant).toBe("xhigh")
     })
 
@@ -381,7 +381,7 @@ describe("sisyphus-task", () => {
       }
 
       //#when
-      await tool.execute(args as unknown as DelegateTaskArgs, toolContext)
+      await tool.execute(args as DelegateTaskArgs, toolContext)
 
       //#then
       expect(args.load_skills).toEqual(["playwright", "git-master"])
@@ -444,7 +444,7 @@ describe("sisyphus-task", () => {
       }
 
       //#when
-      await tool.execute(args as unknown as DelegateTaskArgs, toolContext)
+      await tool.execute(args as DelegateTaskArgs, toolContext)
 
       //#then
       expect(args.load_skills).toEqual([])
@@ -877,7 +877,7 @@ describe("sisyphus-task", () => {
       const categoryName = "my-custom"
       const userCategories = {
         "my-custom": {
-          model: "openai/gpt-5.4",
+          model: "openai/gpt-5.5",
           temperature: 0.5,
           prompt_append: "You are a custom agent",
         },
@@ -888,7 +888,7 @@ describe("sisyphus-task", () => {
 
       // then
       expect(result).not.toBeNull()
-      expect(result!.config.model).toBe("openai/gpt-5.4")
+      expect(result!.config.model).toBe("openai/gpt-5.5")
       expect(result!.config.temperature).toBe(0.5)
       expect(result!.promptAppend).toBe("You are a custom agent")
     })
@@ -927,7 +927,7 @@ describe("sisyphus-task", () => {
     test("systemDefaultModel is used as fallback when custom category has no model", () => {
       // given - custom category with no model defined
       const categoryName = "my-custom-no-model"
-      const userCategories = { "my-custom-no-model": { temperature: 0.5 } } as unknown as Record<string, CategoryConfig>
+      const userCategories: Record<string, CategoryConfig> = { "my-custom-no-model": { temperature: 0.5 } }
       const inheritedModel = "cliproxy/claude-opus-4-7"
 
       // when
@@ -1001,7 +1001,7 @@ describe("sisyphus-task", () => {
          manager: mockManager,
          client: mockClient,
          userCategories: {
-           ultrabrain: { model: "openai/gpt-5.4", variant: "xhigh" },
+           ultrabrain: { model: "openai/gpt-5.5", variant: "xhigh" },
          },
          connectedProvidersOverride: TEST_CONNECTED_PROVIDERS,
          availableModelsOverride: createTestAvailableModels(),
@@ -1029,7 +1029,7 @@ describe("sisyphus-task", () => {
       // then
       expect(launchInput.model).toEqual({
         providerID: "openai",
-        modelID: "gpt-5.4",
+        modelID: "gpt-5.5",
         variant: "xhigh",
       })
     })
@@ -2448,7 +2448,7 @@ describe("sisyphus-task", () => {
          },
        }
        
-       // Use ultrabrain which uses gpt-5.4 (non-gemini)
+       // Use ultrabrain which uses gpt-5.5 (non-gemini)
        const tool = createDelegateTask({
          manager: mockManager,
          client: mockClient,
@@ -2554,7 +2554,7 @@ describe("sisyphus-task", () => {
         models: {
           anthropic: ["claude-opus-4-7", "claude-sonnet-4-6", "claude-haiku-4-5"],
           google: ["gemini-3.1-pro", "gemini-3-flash"],
-        openai: ["gpt-5.5", "gpt-5.4", "gpt-5.3-codex"],
+        openai: ["gpt-5.5", "gpt-5.5", "gpt-5.3-codex"],
           "kimi-for-coding": ["k2p5"],
         },
         connected: ["anthropic", "google", "openai", "kimi-for-coding"],
@@ -2665,7 +2665,7 @@ describe("sisyphus-task", () => {
         client: mockClient,
         userCategories: {
           "my-unstable-cat": {
-            model: "openai/gpt-5.4",
+            model: "openai/gpt-5.5",
             is_unstable_agent: true,
           },
         },
@@ -2747,7 +2747,7 @@ describe("sisyphus-task", () => {
         abort: new AbortController().signal,
       }
 
-      // when - using "quick" category which should use "anthropic/claude-haiku-4-5"
+      // when - using "quick" category which should use the catalog model
       await tool.execute(
         {
           description: "Test category fallback",
@@ -2759,10 +2759,10 @@ describe("sisyphus-task", () => {
         toolContext
       )
 
-      // then - model should be anthropic/claude-haiku-4-5 from DEFAULT_CATEGORIES
+      // then - model should be openai/gpt-5.4-mini from DEFAULT_CATEGORIES
       //         NOT anthropic/claude-sonnet-4-6 (system default)
-      expect(launchInput.model.providerID).toBe("anthropic")
+      expect(launchInput.model.providerID).toBe("openai")
-      expect(launchInput.model.modelID).toBe("claude-haiku-4-5")
+      expect(launchInput.model.modelID).toBe("gpt-5.4-mini")
     })
 
     test("category delegation ignores UI-selected (Kimi) system default model", async () => {
@@ -2812,7 +2812,7 @@ describe("sisyphus-task", () => {
         abort: new AbortController().signal,
       }
 
-      // when - using "quick" category which should use "anthropic/claude-haiku-4-5"
+      // when - using "quick" category which should use the catalog model
       await tool.execute(
         {
           description: "UI model inheritance test",
@@ -2825,8 +2825,8 @@ describe("sisyphus-task", () => {
       )
 
       // then - category model must win (not Kimi)
-      expect(launchInput.model.providerID).toBe("anthropic")
+      expect(launchInput.model.providerID).toBe("openai")
-      expect(launchInput.model.modelID).toBe("claude-haiku-4-5")
+      expect(launchInput.model.modelID).toBe("gpt-5.4-mini")
     })
 
     test("sisyphus-junior model override takes precedence over category model", async () => {
@@ -2873,7 +2873,7 @@ describe("sisyphus-task", () => {
         abort: new AbortController().signal,
       }
 
-      // when - using ultrabrain category (default model is openai/gpt-5.4)
+      // when - using ultrabrain category (default model is openai/gpt-5.5)
       await tool.execute(
         {
           description: "Override precedence test",
@@ -2925,7 +2925,7 @@ describe("sisyphus-task", () => {
          client: mockClient,
          sisyphusJuniorModel: "anthropic/claude-sonnet-4-6",
          userCategories: {
-           ultrabrain: { model: "openai/gpt-5.4" },
+           ultrabrain: { model: "openai/gpt-5.5" },
          },
          connectedProvidersOverride: TEST_CONNECTED_PROVIDERS,
          availableModelsOverride: createTestAvailableModels(),
@@ -2952,7 +2952,7 @@ describe("sisyphus-task", () => {
 
       // then - explicit category model should win
       expect(launchInput.model.providerID).toBe("openai")
-      expect(launchInput.model.modelID).toBe("gpt-5.4")
+      expect(launchInput.model.modelID).toBe("gpt-5.5")
     })
 
     test("sisyphus-junior model override works with quick category (#1295)", async () => {
@@ -3049,7 +3049,7 @@ describe("sisyphus-task", () => {
       const tool = createDelegateTask({
         manager: mockManager,
         client: mockClient,
-        sisyphusJuniorModel: "openai/gpt-5.4",
+        sisyphusJuniorModel: "openai/gpt-5.5",
         userCategories: {
           "my-custom": { temperature: 0.5 },
         },
@@ -3076,7 +3076,7 @@ describe("sisyphus-task", () => {
 
       // then - sisyphus-junior override model should be used as fallback
       expect(launchInput.model.providerID).toBe("openai")
-      expect(launchInput.model.modelID).toBe("gpt-5.4")
+      expect(launchInput.model.modelID).toBe("gpt-5.5")
     })
   })
 
@@ -3447,7 +3447,7 @@ describe("sisyphus-task", () => {
       
       // then - catalog model is used
       expect(resolved).not.toBeNull()
-      expect(resolved!.config.model).toBe("openai/gpt-5.4")
+      expect(resolved!.config.model).toBe("openai/gpt-5.5")
       expect(resolved!.config.variant).toBe("xhigh")
     })
 
@@ -3471,10 +3471,10 @@ describe("sisyphus-task", () => {
       // when
       const resolved = resolveCategoryConfig(categoryName, { inheritedModel, systemDefaultModel: SYSTEM_DEFAULT_MODEL })
       
-      // then - category's built-in model wins (ultrabrain uses gpt-5.4)
+      // then - category's built-in model wins (ultrabrain uses gpt-5.5)
       expect(resolved).not.toBeNull()
       const actualModel = resolved!.config.model
-      expect(actualModel).toBe("openai/gpt-5.4")
+      expect(actualModel).toBe("openai/gpt-5.5")
     })
 
     test("when user defines model - modelInfo should report user-defined regardless of inheritedModel", () => {
@@ -3528,18 +3528,18 @@ describe("sisyphus-task", () => {
       const categoryName = "ultrabrain"
       const inheritedModel = "anthropic/claude-opus-4-7"
       
-      // when category has a built-in model (gpt-5.4 for ultrabrain)
+      // when category has a built-in model (gpt-5.5 for ultrabrain)
       const resolved = resolveCategoryConfig(categoryName, { inheritedModel, systemDefaultModel: SYSTEM_DEFAULT_MODEL })
       
       // then category's built-in model should be used, NOT inheritedModel
       expect(resolved).not.toBeNull()
-      expect(resolved!.model).toBe("openai/gpt-5.4")
+      expect(resolved!.model).toBe("openai/gpt-5.5")
     })
 
     test("FIXED: systemDefaultModel is used when no userConfig.model and no inheritedModel", () => {
       // given a custom category with no default model
       const categoryName = "custom-no-default"
-      const userCategories = { "custom-no-default": { temperature: 0.5 } } as unknown as Record<string, CategoryConfig>
+      const userCategories: Record<string, CategoryConfig> = { "custom-no-default": { temperature: 0.5 } }
       const systemDefaultModel = "anthropic/claude-sonnet-4-6"
       
       // when no inheritedModel is provided, only systemDefaultModel
@@ -3589,8 +3589,7 @@ describe("sisyphus-task", () => {
     test("FIXED: undefined userConfig.model falls back to category built-in model", () => {
       // given user sets a builtin category but leaves model undefined
       const categoryName = "visual-engineering"
-      // Using type assertion since we're testing fallback behavior for categories without model
+      const userCategories: Record<string, CategoryConfig> = { "visual-engineering": { temperature: 0.2 } }
-      const userCategories = { "visual-engineering": { temperature: 0.2 } } as unknown as Record<string, CategoryConfig>
       const inheritedModel = "anthropic/claude-opus-4-7"
       
       // when resolveCategoryConfig is called
@@ -3604,8 +3603,7 @@ describe("sisyphus-task", () => {
     test("systemDefaultModel is used when no other model is available", () => {
       // given - custom category with no model, but systemDefaultModel is set
       const categoryName = "my-custom"
-      // Using type assertion since we're testing fallback behavior for categories without model
+      const userCategories: Record<string, CategoryConfig> = { "my-custom": { temperature: 0.5 } }
-      const userCategories = { "my-custom": { temperature: 0.5 } } as unknown as Record<string, CategoryConfig>
       const systemDefaultModel = "anthropic/claude-sonnet-4-6"
       
       // when
@@ -3936,7 +3934,7 @@ describe("sisyphus-task", () => {
          app: {
            agents: async () => ({
              data: [
-               { name: "oracle", mode: "subagent", model: { providerID: "openai", modelID: "gpt-5.4" } },
+               { name: "oracle", mode: "subagent", model: { providerID: "openai", modelID: "gpt-5.5" } },
              ],
            }),
          },
@@ -4003,7 +4001,7 @@ describe("sisyphus-task", () => {
          app: {
            agents: async () => ({
              data: [
-               { name: "oracle", mode: "subagent", model: { providerID: "openai", modelID: "gpt-5.4" } },
+               { name: "oracle", mode: "subagent", model: { providerID: "openai", modelID: "gpt-5.5" } },
              ],
            }),
          },