From fd7ca1806653368153acb5de9bd282b6b5a3cb54 Mon Sep 17 00:00:00 2001
From: Charles Packer <packercharles@gmail.com>
Date: Sat, 24 Jan 2026 20:10:40 -0800
Subject: [PATCH] fix: patch default model (#670)

Co-authored-by: Letta <noreply@letta.com>
---
 src/agent/model.ts           | 16 ++++++++++++++++
 src/cli/commands/registry.ts | 16 ++++++++--------
 src/index.ts                 | 33 +++++++++++++++++++++++++++++++--
 3 files changed, 55 insertions(+), 10 deletions(-)

diff --git a/src/agent/model.ts b/src/agent/model.ts
index dcd2fb9..f0a0e83 100644
--- a/src/agent/model.ts
+++ b/src/agent/model.ts
@@ -40,6 +40,22 @@ export function getDefaultModel(): string {
   return firstModel.handle;
 }
 
+/**
+ * Get the default model handle based on billing tier.
+ * Free tier users get glm-4.7, everyone else gets the standard default.
+ * @param billingTier - The user's billing tier (e.g., "free", "pro", "enterprise")
+ * @returns The model handle to use as default
+ */
+export function getDefaultModelForTier(billingTier?: string | null): string {
+  // Free tier gets glm-4.7 (a free model)
+  if (billingTier?.toLowerCase() === "free") {
+    const freeDefault = models.find((m) => m.id === "glm-4.7");
+    if (freeDefault) return freeDefault.handle;
+  }
+  // Everyone else (pro, enterprise, unknown) gets the standard default
+  return getDefaultModel();
+}
+
 /**
  * Format available models for error messages
  */
diff --git a/src/cli/commands/registry.ts b/src/cli/commands/registry.ts
index 416b73f..22af551 100644
--- a/src/cli/commands/registry.ts
+++ b/src/cli/commands/registry.ts
@@ -68,12 +68,12 @@ export const commands: Record<string, Command> = {
       return "Opening message search...";
     },
   },
-  "/plan": {
-    desc: "Enter plan mode",
+  "/connect": {
+    desc: "Connect your LLM API keys (OpenAI, Anthropic, etc.)",
     order: 17,
     handler: () => {
-      // Handled specially in App.tsx
-      return "Entering plan mode...";
+      // Handled specially in App.tsx - opens ProviderSelector
+      return "Opening provider connection...";
     },
   },
   "/clear": {
@@ -263,12 +263,12 @@ export const commands: Record<string, Command> = {
   },
 
   // === Session management (order 40-49) ===
-  "/connect": {
-    desc: "Connect your LLM API keys (OpenAI, Anthropic, etc.)",
+  "/plan": {
+    desc: "Enter plan mode",
     order: 40,
     handler: () => {
-      // Handled specially in App.tsx - opens ProviderSelector
-      return "Opening provider connection...";
+      // Handled specially in App.tsx
+      return "Entering plan mode...";
     },
   },
   "/disconnect": {
diff --git a/src/index.ts b/src/index.ts
index a28b75d..89f6072 100755
--- a/src/index.ts
+++ b/src/index.ts
@@ -1514,8 +1514,37 @@ async function main(): Promise<void> {
             return;
           }
 
-          // Use selected server model (from self-hosted model picker) if available
-          const effectiveModel = selectedServerModel || model;
+          // Determine effective model:
+          // 1. Use selectedServerModel if user picked from self-hosted picker
+          // 2. Use model if --model flag was passed
+          // 3. Otherwise, use billing-tier-aware default (free tier gets glm-4.7)
+          let effectiveModel = selectedServerModel || model;
+          if (!effectiveModel && !selfHostedBaseUrl) {
+            // On Letta API without explicit model - check billing tier for appropriate default
+            const { getDefaultModelForTier } = await import("./agent/model");
+            let billingTier: string | null = null;
+            try {
+              const baseURL =
+                process.env.LETTA_BASE_URL ||
+                settings.env?.LETTA_BASE_URL ||
+                LETTA_CLOUD_API_URL;
+              const apiKey =
+                process.env.LETTA_API_KEY || settings.env?.LETTA_API_KEY;
+              const response = await fetch(`${baseURL}/v1/metadata/balance`, {
+                headers: apiKey ? { Authorization: `Bearer ${apiKey}` } : {},
+              });
+              if (response.ok) {
+                const data = (await response.json()) as {
+                  billing_tier?: string;
+                };
+                billingTier = data.billing_tier ?? null;
+              }
+            } catch {
+              // Ignore - will use standard default
+            }
+            effectiveModel = getDefaultModelForTier(billingTier);
+          }
+
           const updateArgs = getModelUpdateArgs(effectiveModel);
           const result = await createAgent(
             undefined,