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Opus is a highly efficient codec, so you can achieve transparency (indistinguishable from the original) at much lower bitrates than MP3 or AAC.

For comparison:
- 320 kbps MP3 and 256 kbps AAC are considered near-transparent for most listeners.
- Opus at 128-160 kbps is typically transparent and equivalent to those formats.
- If you want extra headroom, 192 kbps Opus is overkill and will more than match 320 kbps MP3 while being much more efficient.

In most cases, 160 kbps Opus is a safe equivalent to 320 kbps MP3 / 256 kbps AAC without wasting extra space.