# ONNX013: missing-default-opset

**Code:** `ONNX013`

**Name:** `missing-default-opset`

**Severity:** error

**Category:** spec

**Target:** model

**Fixable:** No

## Message

Model (IR version >= 3) is missing opset import for the default ONNX domain.

## Suggestion

Add an opset import for the default domain, e.g. `model.opset_imports[""] = 21`.

## Details

Models with IR version 3 or higher must include an opset_import for
the default ONNX domain ("").