microsoft/semantic-kernel · error · NotSupportedException

Unsupported Amazon model: {modelId}

Error message

Unsupported Amazon model: {modelId}

What it means

CreateTextGenerationService routes Amazon-provider models to AmazonService only when the model name starts with 'titan-'. Any other Amazon model name throws NotSupportedException. The provider segment is the part before the first dot.

Source

Thrown at dotnet/src/Connectors/Connectors.Amazon/Bedrock/Core/BedrockServiceFactory.cs:64

        switch (modelProvider.ToUpperInvariant())
        {
            case "AI21":
                if (modelName.StartsWith("jamba", StringComparison.OrdinalIgnoreCase))
                {
                    return new AI21JambaService();
                }
                if (modelName.StartsWith("j2-", StringComparison.OrdinalIgnoreCase))
                {
                    return new AI21JurassicService();
                }
                throw new NotSupportedException($"Unsupported AI21 model: {modelId}");
            case "AMAZON":
                if (modelName.StartsWith("titan-", StringComparison.OrdinalIgnoreCase))
                {
                    return new AmazonService();
                }
                throw new NotSupportedException($"Unsupported Amazon model: {modelId}");
            case "ANTHROPIC":
                if (modelName.StartsWith("claude-", StringComparison.OrdinalIgnoreCase))
                {
                    return new AnthropicService();
                }
                throw new NotSupportedException($"Unsupported Anthropic model: {modelId}");
            case "COHERE":
                if (modelName.StartsWith("command-r", StringComparison.OrdinalIgnoreCase))
                {
                    return new CohereCommandRService();
                }
                if (modelName.StartsWith("command-", StringComparison.OrdinalIgnoreCase))
                {
                    return new CohereCommandService();
                }
                throw new NotSupportedException($"Unsupported Cohere model: {modelId}");
            case "META":
                if (modelName.StartsWith("llama3-", StringComparison.OrdinalIgnoreCase))

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Use an Amazon Titan modelId for text generation, e.g. 'amazon.titan-text-premier-v1:0'.
2. Upgrade Connectors.Amazon to a version supporting the Amazon model you need.
3. Confirm the modelId provider segment is exactly 'amazon' and the name starts with 'titan-'.

Example fix

// before
var modelId = "amazon.nova-pro-v1:0";
// -> NotSupportedException: Unsupported Amazon model

// after
var modelId = "amazon.titan-text-premier-v1:0";

static bool IsSupportedAmazonTextModel(string modelId)
{
    var (provider, name) = SplitModelId(modelId);
    return provider.Equals("amazon", StringComparison.OrdinalIgnoreCase)
        && name.StartsWith("titan-", StringComparison.OrdinalIgnoreCase);
}

static bool IsSupportedAmazonTextModel(string modelId)
{
    var (provider, name) = SplitModelId(modelId);
    return provider.Equals("amazon", StringComparison.OrdinalIgnoreCase)
        && name.StartsWith("titan-", StringComparison.OrdinalIgnoreCase);
}

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

When it happens

Trigger: Text generation with modelId provider 'amazon' whose model-name segment does not start with 'titan-' (e.g. 'amazon.nova-pro-v1' or a non-titan Amazon model).

Common situations: Using Amazon Nova or another non-Titan Amazon model that this connector version does not map for text generation. Wrong modelId string. Outdated connector missing newer Amazon models.

Related errors

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

AI-assisted analysis of microsoft/semantic-kernel@c028a0c7dc (2026-08-13). Data as JSON: /api/errors/4af4fe57716ec152. Report an issue: GitHub.