isBilledAsExtraUsage function

bool isBilledAsExtraUsage({ required String? model, required bool isFastMode, required bool isOpus1mMerged, required bool isNeomageAiSubscriber(), required bool has1mContext(String), })

Determines if the current request is billed as extra usage.

Extra usage applies to Neomage AI subscribers when:

• Fast mode is enabled
• Using Opus 4.6 or Sonnet 4.6 with 1M context (unless Opus 1M is merged)

Implementation

bool isBilledAsExtraUsage({
  required String? model,
  required bool isFastMode,
  required bool isOpus1mMerged,
  required bool Function() isNeomageAiSubscriber,
  required bool Function(String) has1mContext,
}) {
  if (!isNeomageAiSubscriber()) return false;
  if (isFastMode) return true;
  if (model == null || !has1mContext(model)) return false;

  final m = model.toLowerCase().replaceAll(RegExp(r'\[1m\]$'), '').trim();
  final isOpus46 = m == 'opus' || m.contains('opus-4-6');
  final isSonnet46 = m == 'sonnet' || m.contains('sonnet-4-6');

  if (isOpus46 && isOpus1mMerged) return false;

  return isOpus46 || isSonnet46;
}