Standard engine (default: near-frontier quality, vision-capable)✓
Budget engine (fallback provider, budget option)
Or paste any other engine ID directly:
On: hard questions get a deeper reasoning pass, and an independent engine checks & corrects difficulty 3+ answers or any answer the engine itself was unsure about (a "✓ verified" mark shows when it does). Off: uses only the single engine selected above: cheaper and faster, no cross-checking.