From 708afb994410f140c811e3421817c33dd80dbd95 Mon Sep 17 00:00:00 2001
From: Fabio RItzel Borges <38725315+fworks-tech@users.noreply.github.com>
Date: Mon, 5 Oct 2026 22:11:29 -0300
Subject: [PATCH] feat(ai): switch chat model to qwen3.8-flash

---
 src/app/api/chat/route.ts            | 2 +-
 src/lib/abuse/__tests__/cost.test.ts | 4 ++--
 src/lib/abuse/cost.ts                | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/app/api/chat/route.ts b/src/app/api/chat/route.ts
index 0332d1b..bb8abb0 100644
--- a/src/app/api/chat/route.ts
+++ b/src/app/api/chat/route.ts
@@ -47,7 +47,7 @@ const zen = (sessionId: string) =>
     },
   });
 
-const MODEL_ID = 'deepseek-v4-flash';
+const MODEL_ID = 'qwen3.8-flash';
 
 const model = (sessionId: string) => zen(sessionId).chatModel(MODEL_ID);
 
diff --git a/src/lib/abuse/__tests__/cost.test.ts b/src/lib/abuse/__tests__/cost.test.ts
index a7c9a85..b429cb9 100644
--- a/src/lib/abuse/__tests__/cost.test.ts
+++ b/src/lib/abuse/__tests__/cost.test.ts
@@ -11,8 +11,8 @@ describe('estimateTokens', () => {
 
 describe('calculateCost', () => {
   it('scales tokens to USD', () => {
-    expect(calculateCost(1_000_000)).toBeCloseTo(0.28);
-    expect(calculateCost(500_000)).toBeCloseTo(0.14);
+    expect(calculateCost(1_000_000)).toBeCloseTo(0.47);
+    expect(calculateCost(500_000)).toBeCloseTo(0.235);
   });
 });
 
diff --git a/src/lib/abuse/cost.ts b/src/lib/abuse/cost.ts
index 6ab1540..39af44e 100644
--- a/src/lib/abuse/cost.ts
+++ b/src/lib/abuse/cost.ts
@@ -8,7 +8,7 @@
 
 export const MAX_TOKENS_PER_REQUEST = 4000;
 const MAX_COST_PER_HOUR_USD = 0.5; // ~$0.50/hour budget
-const TOKEN_COST_PER_1M = 0.28; // deepseek-v4-flash on OpenCode Zen (output upper bound)
+const TOKEN_COST_PER_1M = 0.47; // qwen3.8-flash on OpenCode Zen (output upper bound)
 const USAGE_WINDOW_MS = 60 * 60 * 1000; // 1 hour
 const CLEANUP_INTERVAL_MS = 300_000; // 5 min