microsoft/semantic-kernel · error · NotSupportedException

Unsupported Mistral model: {modelId}

Error message

Unsupported Mistral model: {modelId}

What it means

CreateTextGenerationService routes Mistral models to MistralService when the model name starts with 'mistral-' or 'mixtral-'. Any other Mistral model name throws NotSupportedException.

Source

Thrown at dotnet/src/Connectors/Connectors.Amazon/Bedrock/Core/BedrockServiceFactory.cs:93

                }
                if (modelName.StartsWith("command-", StringComparison.OrdinalIgnoreCase))
                {
                    return new CohereCommandService();
                }
                throw new NotSupportedException($"Unsupported Cohere model: {modelId}");
            case "META":
                if (modelName.StartsWith("llama3-", StringComparison.OrdinalIgnoreCase))
                {
                    return new MetaService();
                }
                throw new NotSupportedException($"Unsupported Meta model: {modelId}");
            case "MISTRAL":
                if (modelName.StartsWith("mistral-", StringComparison.OrdinalIgnoreCase)
                    || modelName.StartsWith("mixtral-", StringComparison.OrdinalIgnoreCase))
                {
                    return new MistralService();
                }
                throw new NotSupportedException($"Unsupported Mistral model: {modelId}");
            default:
                throw new NotSupportedException($"Unsupported model provider: {modelProvider}");
        }
    }

    /// <summary>
    /// Gets the model service for body conversion.
    /// </summary>
    /// <param name="modelId">The model to get the service for.</param>
    /// <returns><see cref="IBedrockChatCompletionService"/> object</returns>
    /// <exception cref="NotSupportedException">Thrown if provider or model is not supported for chat completion.</exception>
    internal IBedrockChatCompletionService CreateChatCompletionService(string modelId)
    {
        (string modelProvider, string modelName) = this.GetModelProviderAndName(ScrubCrossRegionPrefix(modelId));

        switch (modelProvider.ToUpperInvariant())
        {
            case "AI21":

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Use a recognized Mistral modelId such as 'mistral.mistral-7b-instruct-v0:2' or 'mistral.mixtral-8x7b-instruct-v0:1'.
2. Upgrade Connectors.Amazon for newer Mistral model support.
3. Verify the model name starts with 'mistral-' or 'mixtral-'.

Example fix

// before
var modelId = "mistral.large-2407-v1:0"; // not a recognized prefix

// after
var modelId = "mistral.mistral-large-2407-v1:0";

static bool IsSupportedMistralTextModel(string modelId)
{
    var (provider, name) = SplitModelId(modelId);
    return provider.Equals("mistral", StringComparison.OrdinalIgnoreCase)
        && (name.StartsWith("mistral-", StringComparison.OrdinalIgnoreCase)
            || name.StartsWith("mixtral-", StringComparison.OrdinalIgnoreCase));
}

static bool IsSupportedMistralTextModel(string modelId)
{
    var (provider, name) = SplitModelId(modelId);
    return provider.Equals("mistral", StringComparison.OrdinalIgnoreCase)
        && (name.StartsWith("mistral-", StringComparison.OrdinalIgnoreCase)
            || name.StartsWith("mixtral-", StringComparison.OrdinalIgnoreCase));
}

try
{
    var text = await bedrockTextGen.GetTextContentAsync(prompt, settings, ct);
}
catch (NotSupportedException ex) when (ex.Message.Contains("Mistral"))
{
    logger.LogError(ex, "Mistral modelId '{Id}' not supported. Use mistral-* or mixtral-*.", modelId);
    throw;
}

When it happens

Trigger: Text generation with modelId provider 'mistral' whose model-name segment starts with neither 'mistral-' nor 'mixtral-' (e.g. a different Mistral naming convention).

Common situations: A new Mistral model family not yet recognized by the installed connector. Typo in modelId. Wrong provider segment.

Related errors

• Unsupported AI21 model: {modelId}
• Unsupported Amazon model: {modelId}
• Unsupported Anthropic model: {modelId}
• Unsupported Cohere model: {modelId}
• Unsupported Meta model: {modelId}

AI-assisted analysis of microsoft/semantic-kernel@c028a0c7dc (2026-08-13). Data as JSON: /api/errors/1dec1cbcf09bd4df. Report an issue: GitHub.