Add GPT-5 support (#161)

Author: RJ Beers

src/lib/utils/prompting.ts

@@ -39,6 +39,12 @@ Only use the code interpreter tool when it's actually needed for calculations or
  */
 export const CODE_INTERPRETER_SUPPORTED_MODELS = Object.freeze(
   new Set([
+    'gpt-5',
+    'gpt-5-2025-08-07',
+    'gpt-5-mini',
+    'gpt-5-mini-2025-08-07',
+    'gpt-5-nano',
+    'gpt-5-nano-2025-08-07',
     'gpt-4o',
     'gpt-4.1',
     'gpt-4',
@@ -64,6 +70,12 @@ export function isCodeInterpreterSupported(model: string): boolean {
  */
 export const WEB_SEARCH_SUPPORTED_MODELS = Object.freeze(
   new Set([
+    'gpt-5',
+    'gpt-5-2025-08-07',
+    'gpt-5-mini',
+    'gpt-5-mini-2025-08-07',
+    'gpt-5-nano',
+    'gpt-5-nano-2025-08-07',
     'gpt-4o',
     'gpt-4.1',
     'gpt-4',

src/routes/api/chat.ts

@@ -53,7 +53,7 @@ export const ServerRoute = createServerFileRoute('/api/chat').methods({
       if (codeInterpreter && !isCodeInterpreterSupported(model)) {
         return new Response(
           JSON.stringify({
-            error: `Code interpreter is not supported for model: ${model}. Please use a supported model like GPT-4o or o3-series.`,
+            error: `Code interpreter is not supported for model: ${model}. Please use a supported model like GPT-5, GPT-4o, or the o3-series.`,
           }),
           {
             status: 400,

src/routes/api/models.ts

@@ -2,6 +2,7 @@ import { createServerFileRoute } from '@tanstack/react-start/server'
 import OpenAI from 'openai'
 
 const SUPPORTED_MODEL_PREFIXES = [
+  'gpt-5',
   'gpt-4o',
   'chatgpt-4o',
   'gpt-4.1',