unsupported_parameter

Unsupported parameter (HTTP 400)

HTTP status	400
OpenAI type	invalid_request_error
Anthropic type	invalid_request_error
Retry	No. Error responses carry x-should-retry: false.

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What it means

The request uses a field Antara doesn’t support, or one the model can’t honor, such as tools on a model without tool support, n other than 1, or /v1/responses on a model whose runtime doesn’t serve it. Each endpoint’s field table is in Models and the API reference.

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What to do

Remove the field or pick a model that supports it (GET /v1/models lists each model’s capabilities).