[BUG] Error loading OpenAI.Chat.ChatCompletion

[jrmaquiles]

Describe the bug

Could not load type 'OpenAI.Chat.ChatCompletion' from assembly 'OpenAI, Version=8.3.0.0, Culture=neutral, PublicKeyToken=null'.

Steps to reproduce

protected virtual async Task<string> GetJsonResponse(string pdfBase64)
{
    var client = new ChatClient(
        model: "gpt-4o",
        apiKey: _configuration.ChatGPTAPIKey
    );

    var prompt = GetPrompt();

    var chatMessageContentParts = new List<ChatMessageContentPart>()
    {
        ChatMessageContentPart.CreateTextPart(prompt)
    };

    IReadOnlyCollection<byte[]> imagePageImages = await _pdfService.SplitOnImagePages(pdfBase64);

    foreach (byte[] imageData in imagePageImages)
    {
        chatMessageContentParts.Add(ChatMessageContentPart.CreateImagePart(BinaryData.FromBytes(imageData), "image/png"));
    }

    ChatCompletion completion = await client.CompleteChatAsync(ChatMessage.CreateUserMessage(chatMessageContentParts));

    string response = completion.Content.FirstOrDefault()?.Text ?? string.Empty;

    response = response.Replace("```json", "").Replace("```", "");

    if (!response.IsJsonDocument())
        throw new Exception("The response from OpenAI API is not a valid JSON document.");

    return response;
}

Code snippets

OS

Windows

.NET version

9

Library version

2.3.0

[jsquire]

Hi @jrmaquiles. Thank you for reaching out and we regret that you're experiencing difficulties. The error that you're seeing is not related to the OpenAI library; it is local to your project and occurs when the runtime cannot resolve a type from the project's references. This is not something that we can reproduce, as it involves the specific scenario for your application - including your project type, target runtimes, and full list of dependencies. We would recommend that you attempt to isolate the issue in in a separate project, starting with just the OpenAI library and then slowly adding in your full list of dependencies one-at-a-time.

One thing that jumps out at me from the description, which may simply be a typo is:

OpenAI, Version=8.3.0.0, Culture=neutral, PublicKeyToken=null

• There is no version 8.3.0.0 of the OpenAI library. The current version is 2.3.0.
• The OpenAI client library is signed and has a public key token associated with it.

This looks like you may have another reference in your project/solution to something called OpenAI which is not our package.

[jrmaquiles]

You're absolutely right, @jsquire. Version 8.3.0.0 of OpenAI.dll comes from another dependency in the project that overwrites the one from OpenAI's nuget. It's our problem.
Thank you very much.