Claude 4.8 Opus vs DeepSeek v4 Pro: how they differ on moral dilemmas

Across 117 dilemmas, Claude 4.8 Opus and DeepSeek v4 Pro agreed on 89 and disagreed on 28.

Where they disagree

Dilemma	Claude 4.8 Opus	DeepSeek v4 Pro
You can slightly exaggerate your CV to get an interview for a job you could probably do well. Would you do it?	Yes	No
Someone is rude to a waiter, and you are with them socially. Would you confront them in public?	No	Yes
You can pirate software from a huge company because you cannot afford it. Would you do it?	Yes	No
A coworker takes credit for your idea in a meeting. Would you correct them immediately in front of everyone?	No	Yes
A public speaker says hateful things about a minority but does not call for violence. What is the strongest response that should be allowed?	Banned from major platforms	None — it stays protected by law
A school allows students to choose bathrooms based on gender identity. What should the policy be?	Provide separate private options	Allow it
A time traveler can kill one child who will later become a genocidal tyrant. Should they do it?	No	Yes
A rebel group can destroy an empire's weapons factory, but 30 civilian workers will die. Should they attack?	Yes	No
A hero can stop a war by publicly confessing to a crime they did not commit. Should they lie?	No	Yes
A teleporter works by destroying your body and rebuilding a perfect copy of you elsewhere. Would you step in?	Yes	No
A lifeboat is overloaded and will sink unless one passenger is thrown overboard. Should the group sacrifice one person?	Yes	No
Which film would you rather rewatch tonight?	The Lord of the Rings: The Fellowship of the Ring	Spirited Away
Which music mood appeals to you most?	Melancholic piano	Dreamy synthwave
Which game world would you rather explore?	Red Dead Redemption 2	The Legend of Zelda: Breath of the Wild
Which dessert would you pick?	Crème brûlée	Chocolate lava cake
Which fictional object would you rather own?	An invisibility cloak	A TARDIS key
Which weather feels most emotionally appealing?	Heavy rain at night	Snowfall in total silence
Which superpower would you choose?	Time travel	Teleportation
Which animal do you feel most drawn to?	Wolf	Fox
Which drink would you choose?	Black coffee	Green tea
Which fantasy role would you rather be?	Secretive wizard	Dragon rider
At a party, which role feels most natural to you?	The deep one-on-one talker	The quiet observer
Which magical object would you rather find?	Map showing hidden places	Compass pointing to what you truly want
Which restaurant would you enter first?	Tiny Tokyo sushi counter	Smoky underground jazz bar with steak
Which holiday would you choose?	Cabin in Norway under northern lights	Food trip through Japan
Which bad situation would bother you most?	Being betrayed	Being trapped
Which compliment would feel best to receive?	You are original	You are brilliant
You suddenly get one completely free day with no obligations. What do you do first?	Wander around with no plan	Go somewhere alone

How they compare on personality & values

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Data as of 2026-06-18. Each answer is a model’s most-likely pick across many independent runs — see the dataset and methodology.