Semantic Kernel with OpenRouter

Question

I'm trying to set up a Semantic Kernel project and I would like to connect it to the OpenRouter api. To the best of my knowledge, their API should be compatible with the OpenAI API, therefore a connection should work. I used

var httpClient = new HttpClient
{
  Timeout = TimeSpan.FromMinutes(10)
};        

builder.AddOpenAIChatCompletion(
  modelId:"deepseek/deepseek-r1", 
  apiKey: @"my Open Router Api Key", 
  endpoint: new Uri("https://openrouter.ai/api/v1"), 
  httpClient: httpClient);

I get a 404 error when I try this and I don't know why. When I use the OpenAI API everything works.

I also tried using this HttpClientHandler so that the requests go out to OpenRouter but it didn't work either and I get a 405 error:

public class MyHttpMessageHandler : HttpClientHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (request.RequestUri != null && request.RequestUri.Host.Equals("api.openai.com", StringComparison.OrdinalIgnoreCase))
        {
            request.RequestUri = new Uri($"https://openrouter.ai/api/v1");
        }

        return base.SendAsync(request, cancellationToken);
    }
}

Bruno Bernardes · Accepted Answer · 2025-03-14 18:42:08Z

0

I was having the same problem trying to connect to OpenRouter's model deepseek/deepseek-r1-zero:free, so, I changed the model to google/gemma-3-1b-it:free and worked.

I don't know exacly what the problem is, but the Deepseek model doesn't have the capability of function calling yet, then changing to a model that has this feature worked fine for me.

answered Mar 14 at 18:42

Bruno Bernardes

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