> ## Documentation Index
> Fetch the complete documentation index at: https://docs.antarah.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# upstream_invalid_request

> Upstream rejected the request (HTTP 400)

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

## What it means

The model runtime rejected a request that Antara accepted. The message is generic on purpose; `param` names the field when the runtime reported one.

## What to do

Change the named parameter, or the feature you used (for example a JSON schema keyword or a sampling setting the model doesn't accept). Don't retry unchanged.


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