Claude Sonnet 5 vs DeepSeek V4 Pro for emotional support

The verdict

Effectively a dead heat: 9897

Same 12 emotional support tasks, marked blind by three rival labs. Claude Sonnet 5 took 2 tasks, DeepSeek V4 Pro took 0, 10 tied. Tested 16 Aug 2026.

Where they differed most

The task — Driving test at 9am

Your nephew texts at 10pm: 'Test tomorrow 9am. Third attempt. If I fail again I'm done, and everyone at work knows this time.' Write the reply: steady him tonight without hollow certainty — you do not know he will pass, so do not promise it — give him one practical thing for the morning, and take the weight out of the third-attempt story.

Hey. That's a lot to be carrying at 10pm the night before.

I'm not going to tell you you've got this in the bag — I don't know that, and you'd see through it anyway. What I do know: third attempt doesn't mean anything about you except that you didn't quit. It's not a verdict, it's just a number. People pass on the fifth try and forget it ever mattered a year later. The story where everyone's watching and this is "the one that decides everything" — that's the part that'll actually hurt you tomorrow, not the material. Your brain is scared, so it…
I’m glad you reached out. That’s a heavy weight to carry into the night, and I hear you. Right now, the kindest thing you can do is not try to solve tomorrow tonight—just let your brain rest. You’ve put in the work; you’re not walking in cold.

One practical thing for the morning: set out everything you need tonight (ID, water, snack, clothes) so there’s zero scramble. Then, before you walk into the room, stand still for ten seconds and take three slow breaths—in through your nose, out through your mouth. It sounds small, but it resets your ner…

Task by task

TaskClaude Sonnet 5DeepSeek V4 Pro
The dog died1010
Redundant at 551010
She said no advice1010
After the miscarriage1010
Driving test at 9am98
First Father's Day after1010
The 3am calls1010
Days without speaking109
Stop apologising1010
Not a diagnosis99
Her promotion, your rejection1010
The 1am message1010

Full receipts: Claude Sonnet 5, DeepSeek V4 Pro · judges gemini-3.1-pro-preview, gpt-5.6-terra, grok-4.5

Questions people ask

Which is better for emotional support: Claude Sonnet 5 or DeepSeek V4 Pro?

Effectively a dead heat: Claude Sonnet 5 edged it 98/100 to 97/100 on our emotional support suite — too close to matter, so pick on price or the product you already use.

How was this tested?

Both models answered the identical published emotional support tasks. Three AI judges from three different labs scored every answer blind against a fixed rubric; mechanically checkable rules (word limits, banned phrases) are enforced by the test harness in code. The raw outputs and judge verdicts are downloadable.

More emotional support head-to-heads: Claude Sonnet 5 vs GPT-5.5 · Claude Fable 5 vs Claude Sonnet 5 · Claude Opus 4.8 vs Claude Sonnet 5 · Claude Sonnet 5 vs GPT-5.6 Sol · Claude Sonnet 5 vs GPT-5.6 Luna · Claude Sonnet 5 vs GPT-5.3-Codex

Full ranking: Best AI for emotional support · model pages: Claude Sonnet 5, DeepSeek V4 Pro