NotEquals

The NotEquals condition type performs the literal comparison and checks if two values are not identical (including value type).

{
  "Condition": {
    "NotEquals": {
      "${HTTP_COOKIE.wp-test}": "yes"
    }
  }
}

Note! It is the literal value comparison. It means that the integer value 6 does not equal the string value '6' If you do not know ahead what value type will be injected into the condition, consider to type cast it.