How to filter views rows whose nid is less than nid provided by url?
You can implement the hook_views_query_alter() to alter your query and change the = operator by the &lt; operator.

function YOUR_MODULE_NAME_views_query_alter(&amp;$view, &amp;$query) {
  if($view-&gt;name == 'YOUR_VIEW_NAME') {
    /* Using the following line dmp($query)
     * (you need the devel module to use dpm) you will be able to search
     * where is condition to alter, you will see that in the 
     * $query-&gt;where[0]['conditions'][0]['field'] you will have:
     * node.nid = :node_nid
     * so your solution will be replace the 
     * = operator by the &lt; operator
     * at this moment you can't do this from the Views UI
     */
    dpm($query);

    $query-&gt;where[0]['conditions'][0]['field'] = str_replace('=', '&lt;', $query-&gt;where[0]['conditions'][0]['field']);
  }
}


I test the code and in my environment it works as I want it to.

Here is my view for if you want test the code (in this case the view name is articulos):

$view = new view();
$view-&gt;name = 'articulos';
$view-&gt;description = '';
$view-&gt;tag = 'default';
$view-&gt;base_table = 'node';
$view-&gt;human_name = 'articulos';
$view-&gt;core = 7;
$view-&gt;api_version = '3.0';
$view-&gt;disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view-&gt;new_display('default', 'Master', 'default');
$handler-&gt;display-&gt;display_options['title'] = 'articulos';
$handler-&gt;display-&gt;display_options['use_more_always'] = FALSE;
$handler-&gt;display-&gt;display_options['access']['type'] = 'perm';
$handler-&gt;display-&gt;display_options['cache']['type'] = 'none';
$handler-&gt;display-&gt;display_options['query']['type'] = 'views_query';
$handler-&gt;display-&gt;display_options['exposed_form']['type'] = 'basic';
$handler-&gt;display-&gt;display_options['pager']['type'] = 'none';
$handler-&gt;display-&gt;display_options['style_plugin'] = 'default';
$handler-&gt;display-&gt;display_options['row_plugin'] = 'fields';
/* Field: Content: Title */
$handler-&gt;display-&gt;display_options['fields']['title']['id'] = 'title';
$handler-&gt;display-&gt;display_options['fields']['title']['table'] = 'node';
$handler-&gt;display-&gt;display_options['fields']['title']['field'] = 'title';
$handler-&gt;display-&gt;display_options['fields']['title']['label'] = '';
$handler-&gt;display-&gt;display_options['fields']['title']['alter']['word_boundary'] = FALSE;
$handler-&gt;display-&gt;display_options['fields']['title']['alter']['ellipsis'] = FALSE;
/* Sort criterion: Content: Post date */
$handler-&gt;display-&gt;display_options['sorts']['created']['id'] = 'created';
$handler-&gt;display-&gt;display_options['sorts']['created']['table'] = 'node';
$handler-&gt;display-&gt;display_options['sorts']['created']['field'] = 'created';
$handler-&gt;display-&gt;display_options['sorts']['created']['order'] = 'DESC';
/* Contextual filter: Content: Nid */
$handler-&gt;display-&gt;display_options['arguments']['nid']['id'] = 'nid';
$handler-&gt;display-&gt;display_options['arguments']['nid']['table'] = 'node';
$handler-&gt;display-&gt;display_options['arguments']['nid']['field'] = 'nid';
$handler-&gt;display-&gt;display_options['arguments']['nid']['default_argument_type'] = 'fixed';
$handler-&gt;display-&gt;display_options['arguments']['nid']['summary']['number_of_records'] = '0';
$handler-&gt;display-&gt;display_options['arguments']['nid']['summary']['format'] = 'default_summary';
$handler-&gt;display-&gt;display_options['arguments']['nid']['summary_options']['items_per_page'] = '25';
/* Filter criterion: Content: Published */
$handler-&gt;display-&gt;display_options['filters']['status']['id'] = 'status';
$handler-&gt;display-&gt;display_options['filters']['status']['table'] = 'node';
$handler-&gt;display-&gt;display_options['filters']['status']['field'] = 'status';
$handler-&gt;display-&gt;display_options['filters']['status']['value'] = 1;
$handler-&gt;display-&gt;display_options['filters']['status']['group'] = 1;
$handler-&gt;display-&gt;display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Content: Type */
$handler-&gt;display-&gt;display_options['filters']['type']['id'] = 'type';
$handler-&gt;display-&gt;display_options['filters']['type']['table'] = 'node';
$handler-&gt;display-&gt;display_options['filters']['type']['field'] = 'type';
$handler-&gt;display-&gt;display_options['filters']['type']['value'] = array(
  'article' =&gt; 'article',
);

/* Display: Page */
$handler = $view-&gt;new_display('page', 'Page', 'page');
$handler-&gt;display-&gt;display_options['path'] = 'articulos/%';
$translatables['articulos'] = array(
  t('Master'),
  t('articulos'),
  t('more'),
  t('Apply'),
  t('Reset'),
  t('Sort by'),
  t('Asc'),
  t('Desc'),
  t('All'),
  t('Page'),
);