diff --git a/frontend/internal-packages/agent/src/qa-agent/testcaseGeneration/generateTestcaseNode.ts b/frontend/internal-packages/agent/src/qa-agent/testcaseGeneration/generateTestcaseNode.ts
index 12d377a38c..4980c6b5a2 100644
--- a/frontend/internal-packages/agent/src/qa-agent/testcaseGeneration/generateTestcaseNode.ts
+++ b/frontend/internal-packages/agent/src/qa-agent/testcaseGeneration/generateTestcaseNode.ts
@@ -16,9 +16,7 @@ import {
 import type { testcaseAnnotation } from './testcaseAnnotation'
 
 const model = new ChatOpenAI({
-  model: 'gpt-5-nano',
-  reasoning: { effort: 'minimal', summary: 'auto' },
-  verbosity: 'low',
+  model: 'gpt-5-codex',
   useResponsesApi: true,
 }).bindTools([saveTestcaseTool], {
   strict: true,