This guide is intended to assist in the migration to the official OpenAI library (2.0.0-beta.1 or higher) from OpenAI 1.11.0, focusing on side-by-side comparisons for similar operations between libraries. Version 2.0.0-beta.1 will be used for comparison with 1.11.0 but this guide can still be safely used when migrating to higher versions.
Prior to 2.0.0-beta.1, the OpenAI package was a community library not officially supported by OpenAI. See the CHANGELOG for more details.
Familiarity with the OpenAI 1.11.0 package is assumed. For those new to any OpenAI library for .NET, see the README rather than this guide.
The client usage has considerably changed between libraries. While the OpenAI 1.11.0 had a single client, OpenAIAPI, from which multiple APIs could be accessed, OpenAI 2.0.0-beta.1 keeps a separate client per API. The following snippets illustrate this difference when invoking the image generation capability from the Image API:
OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
ImageResult result = await api.ImageGenerations.CreateImageAsync("Draw a quick brown fox jumping over a lazy dog.", Model.DALLE3);OpenAI 2.0.0-beta.1:
ImageClient client = new ImageClient("dall-e-3", "<api-key>");
ClientResult<GeneratedImage> result = await client.GenerateImageAsync("Draw a quick brown fox jumping over a lazy dog.");Another major difference highlighted in the snippets above is that OpenAI 2.0.0-beta.1 requires the model to be explicitly set during client instantiation, while the OpenAIAPI client allows a model to be specified per call.
The table below illustrates to which client each endpoint of OpenAIAPI was ported. Note that the deprecated Completions API is not supported in 2.0.0-beta.1:
| Old library's endpoint | New library's client |
|---|---|
| Chat | ChatClient |
| ImageGenerations | ImageClient |
| TextToSpeech | AudioClient |
| Transcriptions | AudioClient |
| Translations | AudioClient |
| Moderation | ModerationClient |
| Embeddings | EmbeddingClient |
| Files | FileClient |
| Models | ModelClient |
| Completions | Not supported |
To authenticate to OpenAI, you must set an API key when creating a client.
OpenAI 1.11.0 allowed setting the API key in 3 different ways:
- Directly from a string
- From an environment variable
- From a configuration file
OpenAIAPI api;
// Sets the API key directly from a string.
api = new OpenAIAPI("<api-key>");
// Attempts to load the API key from environment variables OPENAI_KEY and OPENAI_API_KEY.
api = new OpenAIAPI(APIAuthentication.LoadFromEnv());
// Attempts to load the API key from a configuration file.
api = new OpenAIAPI(APIAuthentication.LoadFromPath("<directory>", "<filename>"));OpenAI 2.0.0-beta.1 only supports setting it from a string or from an environment variable. The following snippet illustrates the behavior with the ChatClient, but other clients behave the same:
ChatClient client;
// Sets the API key directly from a string.
client = new ChatClient("gpt-3.5-turbo", "<api-key>");
// When no API key string is specified, attempts to load the API key from the environment variable OPENAI_API_KEY.
client = new ChatClient("gpt-3.5-turbo");Note that, unlike the OpenAI 1.11.0, OpenAI 2.0.0-beta.1 will never attempt to load the API key from the OPENAI_KEY environment variable. Only OPENAI_API_KEY is supported.
The following sections illustrate side-by-side comparisons for similar operations between the two libraries, highlighting common scenarios.
OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
Conversation conversation = api.Chat.CreateConversation();
conversation.Model = Model.ChatGPTTurbo;
conversation.AppendSystemMessage("You are a helpful assistant.");
conversation.AppendUserInput("When was the Nobel Prize founded?");
await conversation.GetResponseFromChatbotAsync();
conversation.AppendUserInput("Who was the first person to be awarded one?");
await conversation.GetResponseFromChatbotAsync();
foreach (ChatMessage message in conversation.Messages)
{
Console.WriteLine($"{message.Role}: {message.TextContent}");
}OpenAI 2.0.0-beta.1:
ChatClient client = new ChatClient("gpt-3.5-turbo", "<api-key>");
List<ChatMessage> messages = new List<ChatMessage>()
{
new SystemChatMessage("You are a helpful assistant."),
new UserChatMessage("When was the Nobel Prize founded?")
};
ClientResult<ChatCompletion> result = await client.CompleteChatAsync(messages);
messages.Add(new AssistantChatMessage(result));
messages.Add(new UserChatMessage("Who was the first person to be awarded one?"));
result = await client.CompleteChatAsync(messages);
messages.Add(new AssistantChatMessage(result));
foreach (ChatMessage message in messages)
{
string role = message.GetType().Name;
string text = message.Content[0].Text;
Console.WriteLine($"{role}: {text}");
}OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
Conversation conversation = api.Chat.CreateConversation();
conversation.Model = Model.ChatGPTTurbo;
conversation.AppendUserInput("Give me a list of Nobel Prize winners of the last 5 years.");
await foreach (string response in conversation.StreamResponseEnumerableFromChatbotAsync())
{
Console.Write(response);
}OpenAI 2.0.0-beta.1:
ChatClient client = new ChatClient("gpt-3.5-turbo", "<api-key>");
List<ChatMessage> messages = new List<ChatMessage>()
{
new UserChatMessage("Give me a list of Nobel Prize winners of the last 5 years.")
};
await foreach (StreamingChatCompletionUpdate chatUpdate in client.CompleteChatStreamingAsync(messages))
{
if (chatUpdate.ContentUpdate.Count > 0)
{
Console.Write(chatUpdate.ContentUpdate[0].Text);
}
}OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
ChatRequest request = new ChatRequest()
{
Model = Model.ChatGPTTurbo,
ResponseFormat = request.ResponseFormats.JsonObject,
Messages = new List<ChatMessage>()
{
new ChatMessage(ChatMessageRole.System, "You are a helpful assistant designed to output JSON."),
new ChatMessage(ChatMessageRole.User, "Give me a JSON object listing Nobel Prize winners of the last 5 years.")
}
};
ChatResult result = await api.Chat.CreateChatCompletionAsync(request);
Console.WriteLine(result);OpenAI 2.0.0-beta.1:
ChatClient client = new ChatClient("gpt-3.5-turbo", "<api-key>");
List<ChatMessage> messages = new List<ChatMessage>()
{
new SystemChatMessage("You are a helpful assistant designed to output JSON."),
new UserChatMessage("Give me a JSON object listing Nobel Prize winners of the last 5 years.")
};
ChatCompletionOptions options = new ChatCompletionOptions()
{
ResponseFormat = ChatResponseFormat.JsonObject
};
ClientResult<ChatCompletion> result = await client.CompleteChatAsync(messages, options);
string text = result.Value.Content[0].Text;
Console.WriteLine(text);OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
Conversation conversation = api.Chat.CreateConversation();
byte[] imageData = await File.ReadAllBytesAsync("<file-path>");
conversation.Model = Model.GPT4_Vision;
conversation.AppendUserInput("Describe this image.", ImageInput.FromImageBytes(imageData));
string response = await conversation.GetResponseFromChatbotAsync();
Console.WriteLine(response);OpenAI 2.0.0-beta.1:
ChatClient client = new ChatClient("gpt-4-vision-preview", "<api-key>");
using FileStream file = File.OpenRead("<file-path>");
BinaryData imageData = await BinaryData.FromStreamAsync(file);
List<ChatMessage> messages = new List<ChatMessage>()
{
new UserChatMessage(
ChatMessageContentPart.CreateTextMessageContentPart("Describe this image."),
ChatMessageContentPart.CreateImageMessageContentPart(imageData, "image/png"))
};
ClientResult<ChatCompletion> result = await client.CompleteChatAsync(messages);
string text = result.Value.Content[0].Text;
Console.WriteLine(text);OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
string result = await api.Transcriptions.GetTextAsync("<file-path>", "fr");
Console.WriteLine(result);OpenAI 2.0.0-beta.1:
AudioClient client = new AudioClient("whisper-1", "<api-key>");
AudioTranscriptionOptions options = new AudioTranscriptionOptions()
{
Language = "fr"
};
ClientResult<AudioTranscription> result = await client.TranscribeAudioAsync("<file-path>", options);
string text = result.Value.Text;
Console.WriteLine(text);OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
TextToSpeechRequest request = new TextToSpeechRequest()
{
Input = "Hasta la vista, baby.",
Model = Model.TTS_Speed,
Voice = "alloy"
};
await api.TextToSpeech.SaveSpeechToFileAsync(request, "<file-path>");OpenAI 2.0.0-beta.1:
AudioClient client = new AudioClient("tts-1", "<api-key>");
ClientResult<BinaryData> result = await client.GenerateSpeechFromTextAsync("Hasta la vista, baby.", GeneratedSpeechVoice.Alloy);
BinaryData data = result.Value;
await File.WriteAllBytesAsync("<file-path>", data.ToArray());OpenAI 1.11.0:
OpenAIAPI api = new OpenAIAPI("<api-key>");
ImageGenerationRequest request = new ImageGenerationRequest()
{
Prompt = "Draw a quick brown fox jumping over a lazy dog.",
Model = Model.DALLE3,
Quality = "standard",
Size = ImageSize._1024
};
ImageResult result = await api.ImageGenerations.CreateImageAsync(request);
Console.WriteLine(result.Data[0].Url);OpenAI 2.0.0-beta.1:
ImageClient client = new ImageClient("dall-e-3", "<api-key>");
ImageGenerationOptions options = new ImageGenerationOptions()
{
Quality = GeneratedImageQuality.Standard,
Size = GeneratedImageSize.W1024xH1024
};
ClientResult<GeneratedImage> result = await client.GenerateImageAsync("Draw a quick brown fox jumping over a lazy dog.", options);
Uri imageUri = result.Value.ImageUri;
Console.WriteLine(imageUri.AbsoluteUri);For additional examples, see OpenAI Examples.