Verified model defaults and rejected-model fallback

interface/src/api/client.ts

@@ -1939,12 +1939,22 @@ export const api = {
 			deployment?: string | null;
 		}>;
 	},
-	startOpenAiOAuthBrowser: async (params: {model: string}) => {
+	providerDefaultModels: async () => {
+		const response = await fetch(`${getApiBase()}/providers/default-models`);
+		if (!response.ok) {
+			throw new Error(`API error: ${response.status}`);
+		}
+		return response.json() as Promise<{
+			defaults: Record<string, string>;
+			chatgpt_oauth: string;
+		}>;
+	},
+	startOpenAiOAuthBrowser: async (params?: {model?: string}) => {
 		const response = await fetch(`${getApiBase()}/providers/openai/browser-oauth/start`, {
 			method: "POST",
 			headers: { "Content-Type": "application/json" },
 			body: JSON.stringify({
-				model: params.model,
+				model: params?.model,
 			}),
 		});
 		if (!response.ok) {

interface/src/components/agent-config/ConfigSectionEditor.tsx

@@ -218,8 +218,40 @@ export function ConfigSectionEditor({
 						description: "Model for transcribing audio attachments",
 					},
 				];
+				const textSlotKeys = [
+					"channel",
+					"branch",
+					"worker",
+					"compactor",
+					"cortex",
+				] as const;
+				const textSlotValues = textSlotKeys.map((key) => localValues[key] ?? "");
+				const uniformModel = textSlotValues.every(
+					(slotValue) => slotValue === textSlotValues[0],
+				)
+					? textSlotValues[0]
+					: "";
+				const applyModelToAllSlots = (model: string) => {
+					setLocalValues((prev) => ({
+						...prev,
+						channel: model,
+						branch: model,
+						worker: model,
+						compactor: model,
+						cortex: model,
+					}));
+					setLocalDirty(true);
+				};
 				return (
 					<div className="grid gap-4">
+						<div className="border-b border-app-line/50 pb-4">
+							<ModelSelect
+								label="All Models"
+								description="Apply one model to every role below (voice excluded)"
+								value={uniformModel}
+								onChange={applyModelToAllSlots}
+							/>
+						</div>
 						{modelSlots.map(({key, label, description}) => {
 							const modelValue = localValues[key] ?? "";
 							const thinkingKey =

interface/src/components/settings/ProviderCard.tsx

@@ -13,6 +13,7 @@ export function ProviderCard({
 	removing,
 	actionLabel,
 	showRemove,
+	editDisabled,
 }: ProviderCardProps) {
 	const primaryLabel = actionLabel ?? (configured ? "Update" : "Add key");
 	const shouldShowRemove = showRemove ?? configured;
@@ -34,12 +35,20 @@ export function ProviderCard({
 						)}
 					</div>
 					<p className="mt-0.5 text-sm text-ink-dull">{description}</p>
-					<p className="mt-1 text-tiny text-ink-faint">
-						Default model: <span className="text-ink-dull">{defaultModel}</span>
-					</p>
+					{defaultModel && (
+						<p className="mt-1 text-tiny text-ink-faint">
+							Default model:{" "}
+							<span className="text-ink-dull">{defaultModel}</span>
+						</p>
+					)}
 				</div>
 				<div className="flex gap-2">
-					<Button onClick={onEdit} variant="outline" size="md">
+					<Button
+						onClick={onEdit}
+						variant="outline"
+						size="md"
+						disabled={editDisabled}
+					>
 						{primaryLabel}
 					</Button>
 					{shouldShowRemove && (

interface/src/components/settings/constants.ts

@@ -87,180 +87,156 @@ export const PROVIDERS = [
 		description: "Multi-provider gateway with unified API",
 		placeholder: "sk-or-...",
 		envVar: "OPENROUTER_API_KEY",
-		defaultModel: "openrouter/anthropic/claude-sonnet-4",
 	},
 	{
 		id: "kilo",
 		name: "Kilo Gateway",
 		description: "OpenAI-compatible multi-provider gateway",
 		placeholder: "sk-...",
 		envVar: "KILO_API_KEY",
-		defaultModel: "kilo/anthropic/claude-sonnet-4.5",
 	},
 	{
 		id: "opencode-zen",
 		name: "OpenCode Zen",
 		description: "Multi-format gateway (Kimi, GLM, MiniMax, Qwen)",
 		placeholder: "...",
 		envVar: "OPENCODE_ZEN_API_KEY",
-		defaultModel: "opencode-zen/kimi-k2.5",
 	},
 	{
 		id: "opencode-go",
 		name: "OpenCode Go",
 		description: "Lite OpenCode model catalog and limits",
 		placeholder: "...",
 		envVar: "OPENCODE_GO_API_KEY",
-		defaultModel: "opencode-go/kimi-k2.5",
 	},
 	{
 		id: "anthropic",
 		name: "Anthropic",
 		description: "Claude models (Sonnet, Opus, Haiku)",
 		placeholder: "sk-ant-...",
 		envVar: "ANTHROPIC_API_KEY",
-		defaultModel: "anthropic/claude-sonnet-4",
 	},
 	{
 		id: "openai",
 		name: "OpenAI",
 		description: "GPT models",
 		placeholder: "sk-...",
 		envVar: "OPENAI_API_KEY",
-		defaultModel: "openai/gpt-4.1",
 	},
 	{
 		id: "zai-coding-plan",
 		name: "Z.AI Coding Plan",
 		description: "GLM coding models (glm-4.7, glm-5, glm-4.5-air)",
 		placeholder: "...",
 		envVar: "ZAI_CODING_PLAN_API_KEY",
-		defaultModel: "zai-coding-plan/glm-5",
 	},
 	{
 		id: "zhipu",
 		name: "Z.ai (GLM)",
 		description: "GLM models (GLM-4, GLM-4-Flash)",
 		placeholder: "...",
 		envVar: "ZHIPU_API_KEY",
-		defaultModel: "zhipu/glm-4-plus",
 	},
 	{
 		id: "groq",
 		name: "Groq",
 		description: "Fast inference for Llama, Mixtral models",
 		placeholder: "gsk_...",
 		envVar: "GROQ_API_KEY",
-		defaultModel: "groq/llama-3.3-70b-versatile",
 	},
 	{
 		id: "together",
 		name: "Together AI",
 		description: "Wide model selection with competitive pricing",
 		placeholder: "...",
 		envVar: "TOGETHER_API_KEY",
-		defaultModel: "together/meta-llama/Meta-Llama-3.1-405B-Instruct-Turbo",
 	},
 	{
 		id: "fireworks",
 		name: "Fireworks AI",
 		description: "Fast inference for popular OSS models",
 		placeholder: "...",
 		envVar: "FIREWORKS_API_KEY",
-		defaultModel: "fireworks/accounts/fireworks/models/llama-v3p3-70b-instruct",
 	},
 	{
 		id: "deepseek",
 		name: "DeepSeek",
 		description: "DeepSeek Chat and Reasoner models",
 		placeholder: "sk-...",
 		envVar: "DEEPSEEK_API_KEY",
-		defaultModel: "deepseek/deepseek-chat",
 	},
 	{
 		id: "xai",
 		name: "xAI",
 		description: "Grok models",
 		placeholder: "xai-...",
 		envVar: "XAI_API_KEY",
-		defaultModel: "xai/grok-2-latest",
 	},
 	{
 		id: "mistral",
 		name: "Mistral AI",
 		description: "Mistral Large, Small, Codestral models",
 		placeholder: "...",
 		envVar: "MISTRAL_API_KEY",
-		defaultModel: "mistral/mistral-large-latest",
 	},
 	{
 		id: "gemini",
 		name: "Google Gemini",
 		description: "Google Gemini experimental and production models",
 		placeholder: "AIza...",
 		envVar: "GEMINI_API_KEY",
-		defaultModel: "gemini/gemini-2.5-flash",
 	},
 	{
 		id: "nvidia",
 		name: "NVIDIA NIM",
 		description: "NVIDIA-hosted models via NIM API",
 		placeholder: "nvapi-...",
 		envVar: "NVIDIA_API_KEY",
-		defaultModel: "nvidia/meta/llama-3.1-405b-instruct",
 	},
 	{
 		id: "minimax",
 		name: "MiniMax",
 		description: "MiniMax (Anthropic message format)",
 		placeholder: "sk-...",
 		envVar: "MINIMAX_API_KEY",
-		defaultModel: "minimax/MiniMax-M2.5",
 	},
 	{
 		id: "minimax-cn",
 		name: "MiniMax CN",
 		description: "MiniMax China (Anthropic message format)",
 		placeholder: "sk-...",
 		envVar: "MINIMAX_CN_API_KEY",
-		defaultModel: "minimax-cn/MiniMax-M2.5",
 	},
 	{
 		id: "moonshot",
 		name: "Moonshot AI",
 		description: "Kimi models (Kimi K2, Kimi K2.5)",
 		placeholder: "sk-...",
 		envVar: "MOONSHOT_API_KEY",
-		defaultModel: "moonshot/kimi-k2.5",
 	},
 	{
 		id: "github-copilot",
 		name: "GitHub Copilot",
 		description: "GitHub Copilot API (uses GitHub PAT for token exchange)",
 		placeholder: "ghp_... or gh auth token",
 		envVar: "GITHUB_COPILOT_API_KEY",
-		defaultModel: "github-copilot/claude-sonnet-4",
 	},
 	{
 		id: "azure",
 		name: "Azure OpenAI",
 		description: "Azure OpenAI Service with custom deployments",
 		placeholder: "Azure API key (alphanumeric string)",
 		envVar: "AZURE_API_KEY",
-		defaultModel: "azure/gpt-4o",
 	},
 	{
 		id: "ollama",
 		name: "Ollama",
 		description: "Local or remote Ollama API endpoint",
 		placeholder: "http://localhost:11434",
 		envVar: "OLLAMA_BASE_URL",
-		defaultModel: "ollama/llama3.2",
 	},
 ] as const;
 
-export const CHATGPT_OAUTH_DEFAULT_MODEL = "openai-chatgpt/gpt-5.3-codex";
-
 export const PERMISSION_OPTIONS = [
 	{
 		value: "allow",

interface/src/components/settings/index.ts

@@ -11,7 +11,7 @@ export {ChangelogSection} from "./ChangelogSection";
 export {ConfigFileSection} from "./ConfigFileSection";
 export {ProviderCard} from "./ProviderCard";
 export {ChatGptOAuthDialog} from "./ChatGptOAuthDialog";
-export {SECTIONS, PROVIDERS, CHATGPT_OAUTH_DEFAULT_MODEL, PERMISSION_OPTIONS} from "./constants";
+export {SECTIONS, PROVIDERS, PERMISSION_OPTIONS} from "./constants";
 export type {
 	SectionId,
 	Platform,

interface/src/components/settings/types.ts

@@ -45,6 +45,7 @@ export interface ProviderCardProps {
 	removing: boolean;
 	actionLabel?: string;
 	showRemove?: boolean;
+	editDisabled?: boolean;
 }
 
 export interface ChatGptOAuthDialogProps {