feat: add Vercel AI Gateway as a provider

Adds 'vercel' as a recognized provider throughout the model resolution
system, enabling users with Vercel AI Gateway to use it as a universal
fallback for OpenAI, Anthropic, and Google models.

The gateway transform infers the sub-provider from canonical model names
(claude->anthropic, gpt->openai, gemini->google) and delegates to the
appropriate provider-specific transform, producing model strings like
vercel/anthropic/claude-opus-4.6.

src/cli/config-manager/detect-current-config.ts

@@ -12,6 +12,7 @@ function detectProvidersFromOmoConfig(): {
   hasZaiCodingPlan: boolean
   hasKimiForCoding: boolean
   hasOpencodeGo: boolean
+  hasVercelAiGateway: boolean
 } {
   const omoConfigPath = getOmoConfigPath()
   if (!existsSync(omoConfigPath)) {
@@ -21,6 +22,7 @@ function detectProvidersFromOmoConfig(): {
       hasZaiCodingPlan: false,
       hasKimiForCoding: false,
       hasOpencodeGo: false,
+      hasVercelAiGateway: false,
     }
   }
 
@@ -34,6 +36,7 @@ function detectProvidersFromOmoConfig(): {
         hasZaiCodingPlan: false,
         hasKimiForCoding: false,
         hasOpencodeGo: false,
+        hasVercelAiGateway: false,
       }
     }
 
@@ -43,8 +46,9 @@ function detectProvidersFromOmoConfig(): {
     const hasZaiCodingPlan = configStr.includes('"zai-coding-plan/')
     const hasKimiForCoding = configStr.includes('"kimi-for-coding/')
     const hasOpencodeGo = configStr.includes('"opencode-go/')
+    const hasVercelAiGateway = configStr.includes('"vercel/')
 
-    return { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding, hasOpencodeGo }
+    return { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding, hasOpencodeGo, hasVercelAiGateway }
   } catch {
     return {
       hasOpenAI: true,
@@ -52,6 +56,7 @@ function detectProvidersFromOmoConfig(): {
       hasZaiCodingPlan: false,
       hasKimiForCoding: false,
       hasOpencodeGo: false,
+      hasVercelAiGateway: false,
     }
   }
 }
@@ -78,6 +83,7 @@ export function detectCurrentConfig(): DetectedConfig {
     hasZaiCodingPlan: false,
     hasKimiForCoding: false,
     hasOpencodeGo: false,
+    hasVercelAiGateway: false,
   }
 
   const { format, path } = detectConfigFormat()
@@ -106,12 +112,13 @@ export function detectCurrentConfig(): DetectedConfig {
   const providers = openCodeConfig.provider as Record<string, unknown> | undefined
   result.hasGemini = providers ? "google" in providers : false
 
-  const { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding, hasOpencodeGo } = detectProvidersFromOmoConfig()
+  const { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding, hasOpencodeGo, hasVercelAiGateway } = detectProvidersFromOmoConfig()
   result.hasOpenAI = hasOpenAI
   result.hasOpencodeZen = hasOpencodeZen
   result.hasZaiCodingPlan = hasZaiCodingPlan
   result.hasKimiForCoding = hasKimiForCoding
   result.hasOpencodeGo = hasOpencodeGo
+  result.hasVercelAiGateway = hasVercelAiGateway
 
   return result
 }

src/cli/install-validators.ts

@@ -40,6 +40,7 @@ export function formatConfigSummary(config: InstallConfig): string {
   lines.push(formatProvider("OpenCode Zen", config.hasOpencodeZen, "opencode/ models"))
   lines.push(formatProvider("Z.ai Coding Plan", config.hasZaiCodingPlan, "Librarian/Multimodal"))
   lines.push(formatProvider("Kimi For Coding", config.hasKimiForCoding, "Sisyphus/Prometheus fallback"))
+  lines.push(formatProvider("Vercel AI Gateway", config.hasVercelAiGateway, "universal proxy"))
 
   lines.push("")
   lines.push(color.dim("─".repeat(40)))
@@ -153,6 +154,10 @@ export function validateNonTuiArgs(args: InstallArgs): { valid: boolean; errors:
     errors.push(`Invalid --kimi-for-coding value: ${args.kimiForCoding} (expected: no, yes)`)
   }
 
+  if (args.vercelAiGateway !== undefined && !["no", "yes"].includes(args.vercelAiGateway)) {
+    errors.push(`Invalid --vercel-ai-gateway value: ${args.vercelAiGateway} (expected: no, yes)`)
+  }
+
   return { valid: errors.length === 0, errors }
 }
 
@@ -167,6 +172,7 @@ export function argsToConfig(args: InstallArgs): InstallConfig {
     hasZaiCodingPlan: args.zaiCodingPlan === "yes",
 hasKimiForCoding: args.kimiForCoding === "yes",
     hasOpencodeGo: args.opencodeGo === "yes",
+    hasVercelAiGateway: args.vercelAiGateway === "yes",
   }
 }
 
@@ -179,6 +185,7 @@ export function detectedToInitialValues(detected: DetectedConfig): {
   zaiCodingPlan: BooleanArg
 kimiForCoding: BooleanArg
   opencodeGo: BooleanArg
+  vercelAiGateway: BooleanArg
 } {
   let claude: ClaudeSubscription = "no"
   if (detected.hasClaude) {
@@ -194,5 +201,6 @@ kimiForCoding: BooleanArg
     zaiCodingPlan: detected.hasZaiCodingPlan ? "yes" : "no",
 kimiForCoding: detected.hasKimiForCoding ? "yes" : "no",
     opencodeGo: detected.hasOpencodeGo ? "yes" : "no",
+    vercelAiGateway: detected.hasVercelAiGateway ? "yes" : "no",
   }
 }

src/cli/model-fallback-types.ts

@@ -11,6 +11,7 @@ export interface ProviderAvailability {
 	zai: boolean
 kimiForCoding: boolean
 	opencodeGo: boolean
+	vercelAiGateway: boolean
 	isMaxPlan: boolean
 }
 

src/cli/model-fallback.ts

@@ -105,7 +105,8 @@ export function generateModelConfig(config: InstallConfig): GeneratedOmoConfig {
     avail.copilot ||
     avail.zai ||
     avail.kimiForCoding ||
-    avail.opencodeGo
+    avail.opencodeGo ||
+    avail.vercelAiGateway
   if (!hasAnyProvider) {
     return {
       $schema: SCHEMA_URL,
@@ -130,6 +131,8 @@ export function generateModelConfig(config: InstallConfig): GeneratedOmoConfig {
         agentConfig = { model: "opencode-go/minimax-m2.7" }
       } else if (avail.zai) {
         agentConfig = { model: ZAI_MODEL }
+      } else if (avail.vercelAiGateway) {
+        agentConfig = { model: "vercel/anthropic/claude-haiku-4.5" }
       }
       if (agentConfig) {
         agents[role] = attachAllFallbackModels(agentConfig, req.fallbackChain, avail)
@@ -145,6 +148,8 @@ export function generateModelConfig(config: InstallConfig): GeneratedOmoConfig {
         agentConfig = { model: "opencode/claude-haiku-4-5" }
       } else if (avail.opencodeGo) {
         agentConfig = { model: "opencode-go/minimax-m2.7" }
+      } else if (avail.vercelAiGateway) {
+        agentConfig = { model: "vercel/anthropic/claude-haiku-4.5" }
       } else if (avail.copilot) {
         agentConfig = { model: "github-copilot/gpt-5-mini" }
       } else {

src/cli/provider-availability.ts

@@ -13,6 +13,7 @@ export function toProviderAvailability(config: InstallConfig): ProviderAvailabil
 		zai: config.hasZaiCodingPlan,
 kimiForCoding: config.hasKimiForCoding,
 		opencodeGo: config.hasOpencodeGo,
+		vercelAiGateway: config.hasVercelAiGateway,
 		isMaxPlan: config.isMax20,
 	}
 }
@@ -27,6 +28,7 @@ export function isProviderAvailable(provider: string, availability: ProviderAvai
 		"zai-coding-plan": availability.zai,
 "kimi-for-coding": availability.kimiForCoding,
 		"opencode-go": availability.opencodeGo,
+		vercel: availability.vercelAiGateway,
 	}
 	return mapping[provider] ?? false
 }

src/cli/tui-install-prompts.ts

@@ -110,6 +110,16 @@ export async function promptInstallConfig(detected: DetectedConfig): Promise<Ins
   })
   if (!opencodeGo) return null
 
+  const vercelAiGateway = await selectOrCancel({
+    message: "Do you have a Vercel AI Gateway API key?",
+    options: [
+      { value: "no", label: "No", hint: "Will use other configured providers" },
+      { value: "yes", label: "Yes", hint: "Universal proxy for OpenAI, Anthropic, Google, etc." },
+    ],
+    initialValue: initial.vercelAiGateway,
+  })
+  if (!vercelAiGateway) return null
+
   return {
     hasClaude: claude !== "no",
     isMax20: claude === "max20",
@@ -120,5 +130,6 @@ export async function promptInstallConfig(detected: DetectedConfig): Promise<Ins
     hasZaiCodingPlan: zaiCodingPlan === "yes",
     hasKimiForCoding: kimiForCoding === "yes",
     hasOpencodeGo: opencodeGo === "yes",
+    hasVercelAiGateway: vercelAiGateway === "yes",
   }
 }

src/cli/types.ts

@@ -11,6 +11,7 @@ export interface InstallArgs {
   zaiCodingPlan?: BooleanArg
 kimiForCoding?: BooleanArg
   opencodeGo?: BooleanArg
+  vercelAiGateway?: BooleanArg
   skipAuth?: boolean
 }
 
@@ -24,6 +25,7 @@ export interface InstallConfig {
   hasZaiCodingPlan: boolean
   hasKimiForCoding: boolean
   hasOpencodeGo: boolean
+  hasVercelAiGateway: boolean
 }
 
 export interface ConfigMergeResult {
@@ -44,4 +46,5 @@ export interface DetectedConfig {
   hasZaiCodingPlan: boolean
   hasKimiForCoding: boolean
   hasOpencodeGo: boolean
+  hasVercelAiGateway: boolean
 }

src/shared/model-requirements.test.ts

@@ -35,7 +35,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(sisyphus.requiresAnyModel).toBe(true)
 
     const primary = sisyphus.fallbackChain[0]
-    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode"])
+    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode", "vercel"])
     expect(primary.model).toBe("claude-opus-4-6")
     expect(primary.variant).toBe("max")
 
@@ -132,7 +132,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(multimodalLooker.fallbackChain).toHaveLength(4)
 
     const primary = multimodalLooker.fallbackChain[0]
-    expect(primary.providers).toEqual(["openai", "opencode"])
+    expect(primary.providers).toEqual(["openai", "opencode", "vercel"])
     expect(primary.model).toBe("gpt-5.4")
     expect(primary.variant).toBe("medium")
 
@@ -144,7 +144,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     expect(tertiary.model).toBe("glm-4.6v")
 
     const last = multimodalLooker.fallbackChain[3]
-    expect(last.providers).toEqual(["openai", "github-copilot", "opencode"])
+    expect(last.providers).toEqual(["openai", "github-copilot", "opencode", "vercel"])
     expect(last.model).toBe("gpt-5-nano")
   })
 
@@ -160,7 +160,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
 
     const primary = prometheus.fallbackChain[0]
     expect(primary.model).toBe("claude-opus-4-6")
-    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode"])
+    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode", "vercel"])
     expect(primary.variant).toBe("max")
   })
 
@@ -176,12 +176,12 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
 
     const primary = metis.fallbackChain[0]
     expect(primary.model).toBe("claude-opus-4-6")
-    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode"])
+    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode", "vercel"])
     expect(primary.variant).toBe("max")
 
     const openAiFallback = metis.fallbackChain.find((entry) => entry.providers.includes("openai"))
     expect(openAiFallback).toEqual({
-      providers: ["openai", "github-copilot", "opencode"],
+      providers: ["openai", "github-copilot", "opencode", "vercel"],
       model: "gpt-5.4",
       variant: "high",
     })
@@ -223,7 +223,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
 
     const tertiary = atlas.fallbackChain[2]
     expect(tertiary).toEqual({
-      providers: ["openai", "github-copilot", "opencode"],
+      providers: ["openai", "github-copilot", "opencode", "vercel"],
       model: "gpt-5.4",
       variant: "medium",
     })
@@ -245,7 +245,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
 
     // then
     expect(openAiFallback).toEqual({
-      providers: ["openai", "github-copilot", "opencode"],
+      providers: ["openai", "github-copilot", "opencode", "vercel"],
       model: "gpt-5.4",
       variant: "medium",
     })
@@ -261,7 +261,7 @@ describe("AGENT_MODEL_REQUIREMENTS", () => {
     // #when - accessing hephaestus requirement
     // #then - requiresProvider includes openai, github-copilot, venice, and opencode
     expect(hephaestus).toBeDefined()
-    expect(hephaestus.requiresProvider).toEqual(["openai", "github-copilot", "venice", "opencode"])
+    expect(hephaestus.requiresProvider).toEqual(["openai", "github-copilot", "venice", "opencode", "vercel"])
     expect(hephaestus.requiresModel).toBeUndefined()
   })
 
@@ -415,12 +415,12 @@ describe("CATEGORY_MODEL_REQUIREMENTS", () => {
     const primary = unspecifiedHigh.fallbackChain[0]
     expect(primary.model).toBe("claude-opus-4-6")
     expect(primary.variant).toBe("max")
-    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode"])
+    expect(primary.providers).toEqual(["anthropic", "github-copilot", "opencode", "vercel"])
 
     const secondary = unspecifiedHigh.fallbackChain[1]
     expect(secondary.model).toBe("gpt-5.4")
     expect(secondary.variant).toBe("high")
-    expect(secondary.providers).toEqual(["openai", "github-copilot", "opencode"])
+    expect(secondary.providers).toEqual(["openai", "github-copilot", "opencode", "vercel"])
   })
 
   test("artistry has valid fallbackChain with gemini-3.1-pro as primary", () => {

src/shared/model-requirements.ts

@@ -21,7 +21,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   sisyphus: {
     fallbackChain: [
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
@@ -38,7 +38,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
         ],
         model: "kimi-k2.5",
       },
-      { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.4", variant: "medium" },
+      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5.4", variant: "medium" },
       { providers: ["zai-coding-plan", "opencode"], model: "glm-5" },
       { providers: ["opencode"], model: "big-pickle" },
     ],
@@ -47,27 +47,27 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   hephaestus: {
     fallbackChain: [
       {
-        providers: ["openai", "github-copilot", "venice", "opencode"],
+        providers: ["openai", "github-copilot", "venice", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "medium",
       },
     ],
-    requiresProvider: ["openai", "github-copilot", "venice", "opencode"],
+    requiresProvider: ["openai", "github-copilot", "venice", "opencode", "vercel"],
   },
   oracle: {
     fallbackChain: [
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "high",
       },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
         variant: "high",
       },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
@@ -78,7 +78,7 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
     fallbackChain: [
       { providers: ["opencode-go"], model: "minimax-m2.7" },
       { providers: ["opencode"], model: "minimax-m2.7-highspeed" },
-      { providers: ["anthropic", "opencode"], model: "claude-haiku-4-5" },
+      { providers: ["anthropic", "opencode", "vercel"], model: "claude-haiku-4-5" },
       { providers: ["opencode"], model: "gpt-5-nano" },
     ],
   },
@@ -87,33 +87,33 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
       { providers: ["github-copilot", "xai"], model: "grok-code-fast-1" },
       { providers: ["opencode-go"], model: "minimax-m2.7-highspeed" },
       { providers: ["opencode"], model: "minimax-m2.7" },
-      { providers: ["anthropic", "opencode"], model: "claude-haiku-4-5" },
+      { providers: ["anthropic", "opencode", "vercel"], model: "claude-haiku-4-5" },
       { providers: ["opencode"], model: "gpt-5-nano" },
     ],
   },
   "multimodal-looker": {
     fallbackChain: [
-      { providers: ["openai", "opencode"], model: "gpt-5.4", variant: "medium" },
+      { providers: ["openai", "opencode", "vercel"], model: "gpt-5.4", variant: "medium" },
       { providers: ["opencode-go"], model: "kimi-k2.5" },
       { providers: ["zai-coding-plan"], model: "glm-4.6v" },
-      { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5-nano" },
+      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5-nano" },
     ],
   },
   prometheus: {
     fallbackChain: [
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "high",
       },
       { providers: ["opencode-go"], model: "glm-5" },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
       },
     ],
@@ -121,12 +121,12 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   metis: {
     fallbackChain: [
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "high",
       },
@@ -137,17 +137,17 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   momus: {
     fallbackChain: [
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "xhigh",
       },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
         variant: "high",
       },
@@ -156,10 +156,10 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   atlas: {
     fallbackChain: [
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-sonnet-4-6" },
+      { providers: ["anthropic", "github-copilot", "opencode", "vercel"], model: "claude-sonnet-4-6" },
       { providers: ["opencode-go"], model: "kimi-k2.5" },
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "medium",
       },
@@ -168,10 +168,10 @@ export const AGENT_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   },
   "sisyphus-junior": {
     fallbackChain: [
-      { providers: ["anthropic", "github-copilot", "opencode"], model: "claude-sonnet-4-6" },
+      { providers: ["anthropic", "github-copilot", "opencode", "vercel"], model: "claude-sonnet-4-6" },
       { providers: ["opencode-go"], model: "kimi-k2.5" },
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "medium",
       },
@@ -185,13 +185,13 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   "visual-engineering": {
     fallbackChain: [
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
         variant: "high",
       },
       { providers: ["zai-coding-plan", "opencode"], model: "glm-5" },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
@@ -202,17 +202,17 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   ultrabrain: {
     fallbackChain: [
       {
-        providers: ["openai", "opencode"],
+        providers: ["openai", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "xhigh",
       },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
         variant: "high",
       },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
@@ -222,17 +222,17 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   deep: {
     fallbackChain: [
       {
-        providers: ["openai", "github-copilot", "venice", "opencode"],
+        providers: ["openai", "github-copilot", "venice", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "medium",
       },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
         variant: "high",
       },
@@ -241,31 +241,31 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   artistry: {
     fallbackChain: [
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3.1-pro",
         variant: "high",
       },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
-      { providers: ["openai", "github-copilot", "opencode"], model: "gpt-5.4" },
+      { providers: ["openai", "github-copilot", "opencode", "vercel"], model: "gpt-5.4" },
     ],
     requiresModel: "gemini-3.1-pro",
   },
   quick: {
     fallbackChain: [
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4-mini",
       },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-haiku-4-5",
       },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3-flash",
       },
       { providers: ["opencode-go"], model: "minimax-m2.7" },
@@ -275,17 +275,17 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   "unspecified-low": {
     fallbackChain: [
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-sonnet-4-6",
       },
       {
-        providers: ["openai", "opencode"],
+        providers: ["openai", "opencode", "vercel"],
         model: "gpt-5.3-codex",
         variant: "medium",
       },
       { providers: ["opencode-go"], model: "kimi-k2.5" },
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3-flash",
       },
       { providers: ["opencode-go"], model: "minimax-m2.7" },
@@ -294,12 +294,12 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   "unspecified-high": {
     fallbackChain: [
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-opus-4-6",
         variant: "max",
       },
       {
-        providers: ["openai", "github-copilot", "opencode"],
+        providers: ["openai", "github-copilot", "opencode", "vercel"],
         model: "gpt-5.4",
         variant: "high",
       },
@@ -323,12 +323,12 @@ export const CATEGORY_MODEL_REQUIREMENTS: Record<string, ModelRequirement> = {
   writing: {
     fallbackChain: [
       {
-        providers: ["google", "github-copilot", "opencode"],
+        providers: ["google", "github-copilot", "opencode", "vercel"],
         model: "gemini-3-flash",
       },
       { providers: ["opencode-go"], model: "kimi-k2.5" },
       {
-        providers: ["anthropic", "github-copilot", "opencode"],
+        providers: ["anthropic", "github-copilot", "opencode", "vercel"],
         model: "claude-sonnet-4-6",
       },
       { providers: ["opencode-go"], model: "minimax-m2.7" },

src/shared/provider-model-id-transform.ts

@@ -1,4 +1,25 @@
+function inferSubProvider(model: string): string | undefined {
+	if (model.startsWith("claude-")) return "anthropic"
+	if (model.startsWith("gpt-")) return "openai"
+	if (model.startsWith("gemini-")) return "google"
+	if (model.startsWith("grok-")) return "xai"
+	return undefined
+}
+
 export function transformModelForProvider(provider: string, model: string): string {
+	if (provider === "vercel") {
+		const slashIndex = model.indexOf("/")
+		if (slashIndex !== -1) {
+			const subProvider = model.substring(0, slashIndex)
+			const subModel = model.substring(slashIndex + 1)
+			return `${subProvider}/${transformModelForProvider(subProvider, subModel)}`
+		}
+		const subProvider = inferSubProvider(model)
+		if (subProvider) {
+			return `${subProvider}/${transformModelForProvider(subProvider, model)}`
+		}
+		return model
+	}
 	if (provider === "github-copilot") {
 		return model
 			.replace("claude-opus-4-6", "claude-opus-4.6")