beta_required
The message text is shown in the example below.
⚠️
Preview — this feature is being built; the design below is the spec. Not in the public error catalog: planned for preview endpoints.
| HTTP status | 400 |
type | invalid_request_error |
| Retry? | No, not unchanged |
| Status | Preview |
| Extra fields | none |
When it happens
A preview endpoint or field was used without its syntic-beta flag.
Example
{
"error": {
"type": "invalid_request_error",
"code": "beta_required",
"message": "This endpoint requires a syntic-beta flag.",
"param": null,
"request_id": "req_6f1c2a9e0b7d4c3a8e5f1b2d"
}
}How to fix it
- Add the flag named on the endpoint’s page, for example
syntic-beta: agents-2026-11-01.
Detect it in code
err = resp.json().get("error", {})
if resp.status_code == 400 and err.get("code") == "beta_required":
log.warning("%s (%s)", err["message"], err["request_id"]) # fix the request; do not retry unchangedRelated
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