Power Platform Community Forum Thread Details

Hi Team,

We are currently using the Anthropic “Create a message” action in Power Automate, and at this time the available selectable model appears to be limited to Claude Sonnet 4.0 only.

As Claude Sonnet 4.0 is approaching end-of-support (June15, 2026) / deprecation status, we would like to request support for newer Anthropic models, specifically Claude Sonnet 4.6, within the Power Automate connector/action.

The error message is shown like this when I used 'Enter custom value'.
Flow save failed with code 'OpenApiOperationParameterValidationFailed' and message 'Input parameter 'body' validation failed in workflow operation 'Create_a_message': The API operation 'MessagePost' requires the property 'body/model' to be set to one of its defined enum values '["claude-opus-4-0","claude-sonnet-4-0","claude-3-7-sonnet-latest","claude-3-5-sonnet-latest","claude-3-5-haiku-latest","claude-3-opus-latest"]' but is set to 'claude-sonnet-4-6'.'.

Thanks,

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Categories:

Connector development

Hi HH-30011357-0 ,

Thank you for choosing Microsoft Community.

Power Automate rejects Claude Sonnet 4.6 because the Anthropic Create a message action only accepts models explicitly listed in its built‑in OpenAPI schema, and that schema currently includes Sonnet 4.0, Opus 4.0, and the Claude 3.x family but not Sonnet 4.6, so any custom value outside the allowed fixed list of allowed values fails validation; the only workable options today are to use a supported model such as claude‑3‑7‑sonnet‑latest, request Microsoft to update the connector, or bypass the connector entirely by calling Anthropic’s API through an HTTP action or custom connector.

Microsoft’s official documentation for the Anthropic connector, including the supported model list

I hope this helps resolve the issue! If you need more specific guidance, feel free to ask.

Resource: Copilot in Microsoft 365 apps with Anthropic models | Microsoft Learn

🏷️ Please tag me @Robu1 if you still have any queries related to the solution or issue persists.

✅ Please click Accept as solution if my post helped you solve your issue and help others who will face the similar issue in future. ❤️ Please consider giving it a Like, If the approach was useful in other ways.

Happy to help

Robu 1👩‍💻