diff --git a/src/gateway/gateway.ts b/src/gateway/gateway.ts
index c54d4bd..a582da1 100644
--- a/src/gateway/gateway.ts
+++ b/src/gateway/gateway.ts
@@ -23,6 +23,7 @@ import { isCommand as _isCmd, isCommandWithArgs as _isCmdArgs, resolveAgentThrea
 import { saveAttachments as _saveAttachments, type AttachmentResult } from "./attachments";
 import { handleStreaming as _handleStream } from "./streaming";
 import { handleNew, handleRestart, handleUpdate, handleCompact, handleStatus, handleStop, handleVerbose, handleDoctor, handleCrons, type CommandContext } from "./commands";
+import { handleModel } from "./model-command";
 import { TelegramAdapter } from "../transports";
 import type { TransportAdapter } from "../transports";
 import { hostname } from "node:os";
@@ -264,6 +265,12 @@ export class Gateway {
         return;
       }
 
+      // Handle /model command
+      if (isCommandWithArgs(userText.trim(), "/model") || isCommand(userText.trim(), "/model")) {
+        await handleModel({ thread, text: userText.trim(), postWithFallback: (t, txt) => this.postWithFallback(t, txt) });
+        return;
+      }
+
       // Dispatch to agent turn handler
       await this.handleAgentTurn(thread, agentThreadId, userText, rawAttachments, verboseThreads, threadLocks, abortControllers);
     };
diff --git a/src/gateway/model-command.ts b/src/gateway/model-command.ts
new file mode 100644
index 0000000..f625248
--- /dev/null
+++ b/src/gateway/model-command.ts
@@ -0,0 +1,96 @@
+/**
+ * gateway/model-command.ts — Handle the /model command
+ *
+ * Allows switching the default AI model from Telegram.
+ * Reads/writes ~/.pi/agent/settings.json (defaultProvider + defaultModel).
+ */
+
+import { homedir } from "node:os";
+import { join } from "node:path";
+import { readFileSync, writeFileSync } from "node:fs";
+
+/** Known model aliases → Bedrock model IDs */
+const MODEL_ALIASES: Record<string, { provider: string; model: string; label: string }> = {
+  "opus": { provider: "amazon-bedrock", model: "us.anthropic.claude-opus-4-6", label: "Claude Opus 4.6" },
+  "opus-4.6": { provider: "amazon-bedrock", model: "us.anthropic.claude-opus-4-6", label: "Claude Opus 4.6" },
+  "opus-4.7": { provider: "amazon-bedrock", model: "us.anthropic.claude-opus-4-7", label: "Claude Opus 4.7" },
+  "sonnet": { provider: "amazon-bedrock", model: "us.anthropic.claude-sonnet-4-6", label: "Claude Sonnet 4.6" },
+  "sonnet-4.6": { provider: "amazon-bedrock", model: "us.anthropic.claude-sonnet-4-6", label: "Claude Sonnet 4.6" },
+  "haiku": { provider: "amazon-bedrock", model: "us.anthropic.claude-haiku-4-5", label: "Claude Haiku 4.5" },
+  "haiku-4.5": { provider: "amazon-bedrock", model: "us.anthropic.claude-haiku-4-5", label: "Claude Haiku 4.5" },
+};
+
+const SETTINGS_PATH = join(homedir(), ".pi", "agent", "settings.json");
+
+export interface ModelCommandContext {
+  thread: any;
+  text: string;
+  postWithFallback: (thread: any, text: string) => Promise<void>;
+}
+
+function readSettings(): Record<string, any> {
+  try {
+    return JSON.parse(readFileSync(SETTINGS_PATH, "utf8"));
+  } catch {
+    return {};
+  }
+}
+
+function writeSettings(settings: Record<string, any>): void {
+  writeFileSync(SETTINGS_PATH, JSON.stringify(settings, null, 2) + "\n");
+}
+
+function getCurrentModel(settings: Record<string, any>): string {
+  const provider = settings.defaultProvider ?? "unknown";
+  const model = settings.defaultModel ?? "unknown";
+  // Try to find a friendly label
+  for (const [alias, info] of Object.entries(MODEL_ALIASES)) {
+    if (info.provider === provider && info.model === model) return `${info.label} (${alias})`;
+  }
+  return `${provider}/${model}`;
+}
+
+export async function handleModel(ctx: ModelCommandContext): Promise<void> {
+  const { thread, text, postWithFallback } = ctx;
+  const parts = text.split(/\s+/).slice(1);
+  const target = parts[0]?.toLowerCase();
+
+  const settings = readSettings();
+
+  // No argument: show current model + available options
+  if (!target) {
+    const current = getCurrentModel(settings);
+    const aliases = Object.entries(MODEL_ALIASES)
+      .filter(([alias]) => !alias.includes(".")) // Show short aliases only
+      .map(([alias, info]) => `  \`${alias}\` → ${info.label}`)
+      .join("\n");
+
+    await postWithFallback(thread, `🤖 *Current model:* ${current}\n\n*Available:*\n${aliases}\n\n_Usage:_ \`/model sonnet\``);
+    return;
+  }
+
+  // Resolve alias or use as raw model ID
+  const resolved = MODEL_ALIASES[target];
+  if (!resolved) {
+    // Check if it looks like a full model ID (contains a dot or slash)
+    if (target.includes(".") || target.includes("/")) {
+      // Use as-is with current provider
+      const provider = settings.defaultProvider ?? "amazon-bedrock";
+      settings.defaultModel = target;
+      settings.defaultProvider = provider;
+      writeSettings(settings);
+      await postWithFallback(thread, `✅ Model set to: \`${provider}/${target}\`\n\n⚠️ Restart needed: \`/restart\``);
+    } else {
+      const aliases = Object.keys(MODEL_ALIASES).filter(a => !a.includes(".")).join(", ");
+      await postWithFallback(thread, `❌ Unknown model: \`${target}\`\n\nAvailable: ${aliases}`);
+    }
+    return;
+  }
+
+  settings.defaultProvider = resolved.provider;
+  settings.defaultModel = resolved.model;
+  writeSettings(settings);
+
+  await postWithFallback(thread, `✅ Model switched to: *${resolved.label}*\n\n⚠️ Takes effect on next agent turn (new sessions use new model).`);
+  console.log(`[roundhouse] /model: switched to ${resolved.provider}/${resolved.model}`);
+}
diff --git a/src/transports/telegram/bot-commands.ts b/src/transports/telegram/bot-commands.ts
index 671ed12..e1763fa 100644
--- a/src/transports/telegram/bot-commands.ts
+++ b/src/transports/telegram/bot-commands.ts
@@ -13,6 +13,7 @@ export interface BotCommand {
 export const BOT_COMMANDS: BotCommand[] = [
   { command: "new", description: "Start a fresh conversation" },
   { command: "compact", description: "Compact context window" },
+  { command: "model", description: "Show or switch AI model" },
   { command: "verbose", description: "Toggle verbose tool output" },
   { command: "stop", description: "Stop the current agent run" },
   { command: "restart", description: "Restart agent process" },