Use gpt-5.4-nano as default chat model

README.md

@@ -107,9 +107,8 @@ Option A — .env files (recommended for local development):
 
     ```dotenv
     VITE_OPENAI_API_KEY=your_openai_api_key_here
-    # Optional: override the chat model (defaults to gpt-4.1).
-    # The chat app supports GPT-4* and below; GPT-5* and later are NOT supported.
-    # VITE_OPENAI_MODEL=gpt-4.1
+    # Optional: override the chat model (defaults to gpt-5.4-nano).
+    # VITE_OPENAI_MODEL=gpt-5.4-nano
     ```
 
 **Azure OpenAI** (using your own hosted deployment)
@@ -124,7 +123,7 @@ Option A — .env files (recommended for local development):
     # Required for Azure OpenAI
     VITE_OPENAI_API_VERSION=2024-12-01-preview
     # On Azure, this is your DEPLOYMENT NAME (not the underlying model id).
-    # The chat app supports GPT-4* family deployments and below; GPT-5* and later are NOT supported.
+    # Ensure this deployment targets a chat-completions-compatible model.
     VITE_OPENAI_MODEL=your_chat_deployment_name
     ```
 
@@ -152,13 +151,13 @@ Both apps read these `VITE_*` variables from their respective `.env` files.
 | Variable                  | Description                                                                                                                         | Default   |
 | ------------------------- | ----------------------------------------------------------------------------------------------------------------------------------- | --------- |
 | `VITE_OPENAI_API_KEY`     | **Required.** Your OpenAI API key, or your Azure OpenAI resource key when `VITE_OPENAI_BASE_URL` is set.                            | _(unset)_ |
-| `VITE_OPENAI_MODEL`       | Chat model used for completions. On Azure OpenAI this is the **deployment name**. The image-generation model is selected in the UI. | `gpt-4.1` |
+| `VITE_OPENAI_MODEL`       | Chat model used for completions. On Azure OpenAI this is the **deployment name**. The image-generation model is selected in the UI. | `gpt-5.4-nano` |
 | `VITE_OPENAI_BASE_URL`    | Custom endpoint. Set this to use Azure OpenAI (e.g. `https://your-resource.openai.azure.com`) or another OpenAI-compatible service. | _(unset)_ |
 | `VITE_OPENAI_API_VERSION` | API version. **Required** when `VITE_OPENAI_BASE_URL` points at Azure OpenAI (e.g. `2024-12-01-preview`).                           | _(unset)_ |
 
 When `VITE_OPENAI_BASE_URL` is set, the apps use the Azure OpenAI client; otherwise they use the standard OpenAI client.
 
-> **Model compatibility:** The chat reference app supports **GPT-4\* family models and below** (e.g. `gpt-4`, `gpt-4.1`, `gpt-4o`). **GPT-5\* and later are not supported.** On Azure OpenAI, make sure the deployment named in `VITE_OPENAI_MODEL` targets a supported model.
+> **Model compatibility:** The chat reference app uses `VITE_OPENAI_MODEL`, defaulting to `gpt-5.4-nano`. On Azure OpenAI, make sure the deployment named in `VITE_OPENAI_MODEL` targets a chat-completions-compatible model.
 
 Start the dev servers:
 

apps/promptions-chat/.env.example

@@ -11,6 +11,5 @@ VITE_OPENAI_API_KEY=your_openai_api_key_here
 # Required when VITE_OPENAI_BASE_URL points at Azure OpenAI.
 # VITE_OPENAI_API_VERSION=2024-12-01-preview
 
-# Optional: override the chat model (defaults to gpt-4.1). 
-# Note that the Promptions Chat App does not support GPT-5* or later
-# VITE_OPENAI_MODEL=gpt-4.1
+# Optional: override the chat model (defaults to gpt-5.4-nano).
+# VITE_OPENAI_MODEL=gpt-5.4-nano

apps/promptions-chat/README.md

@@ -87,12 +87,12 @@ yarn typecheck
 - **React 18** - Modern React with hooks
 - **Vite** - Fast build tool and dev server
 - **Fluent UI** - Microsoft's design system
-- **OpenAI / Azure OpenAI API** - Streaming chat completions (defaults to `gpt-4.1`)
+- **OpenAI / Azure OpenAI API** - Streaming chat completions (defaults to `gpt-5.4-nano`)
 - **TypeScript** - Full type safety
 
 ## Model compatibility
 
-The chat app supports **GPT-4\* family models and below** (e.g. `gpt-4`, `gpt-4.1`, `gpt-4o`). **GPT-5\* and later are not supported.** When using Azure OpenAI, ensure the deployment named in `VITE_OPENAI_MODEL` targets a supported model.
+The chat app uses the model configured in `VITE_OPENAI_MODEL`, defaulting to `gpt-5.4-nano`. When using Azure OpenAI, ensure the deployment named in `VITE_OPENAI_MODEL` targets a chat-completions-compatible model.
 
 ## Security Notes
 

apps/promptions-chat/src/services/ChatService.ts

@@ -22,7 +22,7 @@ export class ChatService {
 
         const baseURL = import.meta.env.VITE_OPENAI_BASE_URL;
         const apiVersion = import.meta.env.VITE_OPENAI_API_VERSION;
-        this.model = import.meta.env.VITE_OPENAI_MODEL || "gpt-4.1";
+        this.model = import.meta.env.VITE_OPENAI_MODEL || "gpt-5.4-nano";
 
         this.client = baseURL
             ? new AzureOpenAI({
@@ -50,8 +50,7 @@ export class ChatService {
                     model: this.model,
                     messages: messages as OpenAI.Chat.Completions.ChatCompletionMessageParam[],
                     stream: true,
-                    temperature: 0.7,
-                    max_tokens: 1000,
+                    max_completion_tokens: 1000,
                 },
                 {
                     signal: options?.signal,
@@ -78,8 +77,7 @@ export class ChatService {
             const response = await this.client.chat.completions.create({
                 model: this.model,
                 messages: messages as OpenAI.Chat.Completions.ChatCompletionMessageParam[],
-                temperature: 0.7,
-                max_tokens: 1000,
+                max_completion_tokens: 1000,
             });
 
             return response.choices[0]?.message?.content || "No response received";

apps/promptions-image/.env.example

@@ -11,6 +11,6 @@ VITE_OPENAI_API_KEY=your_openai_api_key_here
 # Required when VITE_OPENAI_BASE_URL points at Azure OpenAI.
 # VITE_OPENAI_API_VERSION=2024-12-01-preview
 
-# Optional: override the chat model used for prompt-related completions (defaults to gpt-4.1).
+# Optional: override the chat model used for prompt-related completions (defaults to gpt-5.4-nano).
 # The image-generation model is selected in the UI.
-# VITE_OPENAI_MODEL=gpt-4.1
+# VITE_OPENAI_MODEL=gpt-5.4-nano

apps/promptions-image/src/services/ImageService.ts

@@ -16,7 +16,7 @@ export class ImageService {
 
         const baseURL = import.meta.env.VITE_OPENAI_BASE_URL;
         const apiVersion = import.meta.env.VITE_OPENAI_API_VERSION;
-        this.chatModel = import.meta.env.VITE_OPENAI_MODEL || "gpt-4.1";
+        this.chatModel = import.meta.env.VITE_OPENAI_MODEL || "gpt-5.4-nano";
 
         this.client = baseURL
             ? new AzureOpenAI({
@@ -76,8 +76,7 @@ export class ImageService {
                     model: this.chatModel,
                     messages: messages as OpenAI.Chat.Completions.ChatCompletionMessageParam[],
                     stream: true,
-                    temperature: 0.7,
-                    max_tokens: 1000,
+                    max_completion_tokens: 1000,
                 },
                 {
                     signal: options?.signal,