gpt-4o as vision model

https://platform.openai.com/docs/guides/vision

app/utils.ts

@@ -297,6 +297,7 @@ export function isVisionModel(model: string) {
     "claude-3",
     "gemini-1.5-pro",
     "gemini-1.5-flash",
+    "gpt-4o",
   ];
   const isGpt4Turbo =
     model.includes("gpt-4-turbo") && !model.includes("preview");