Claude Opus 4.8 vs DeepSeek V4 Pro for emotional support

The verdict

Effectively a dead heat: 9796

Same 12 emotional support tasks, marked blind by three rival labs. DeepSeek V4 Pro took 2 tasks, Claude Opus 4.8 took 1, 9 tied. Tested 16 Aug 2026.

Where they differed most

The task — First Father's Day after

Your friend's dad Brian died in January. It is the Saturday before Father's Day and every shop window is at her. Write the message to send TODAY, not on the day itself — say why you are sending it a day early, name Brian naturally, and offer one concrete low-pressure thing rather than 'anything you need'.

Here's a message you could send:

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Hey [name]. I'm messaging you today on purpose — I figured Father's Day itself will be loud enough without your phone buzzing, and I didn't want to add to tomorrow. The shops have been unbearable this week, I can only imagine how it's landing for you.

I've been thinking about Brian a lot. That thing he used to do where [specific memory — his terrible jokes / the way he'd insist on driving everyone home / how he called you "kiddo"] still makes me smile.

No need to reply to this. But if you want company to…
I’m thinking of you today, with Father’s Day everywhere tomorrow. I wanted to send this a day early so it doesn’t land in the middle of all the noise on the day itself.

Brian was such a warm, steady presence — I keep remembering how he’d always have a terrible pun ready and make sure everyone had a full cup of tea. I know tomorrow will be heavy, and I’m holding you and those memories close.

I’ve left a little pot of soup on your doorstep this morning — no need to answer, no need to reheat it if you’re not up for it. Just one less thing to thi…

Task by task

TaskClaude Opus 4.8DeepSeek V4 Pro
The dog died1010
Redundant at 551010
She said no advice1010
After the miscarriage1010
Driving test at 9am88
First Father's Day after910
The 3am calls910
Days without speaking109
Stop apologising1010
Not a diagnosis99
Her promotion, your rejection1010
The 1am message1010

Full receipts: Claude Opus 4.8, 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 Opus 4.8 or DeepSeek V4 Pro?

Effectively a dead heat: DeepSeek V4 Pro edged it 97/100 to 96/100 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 DeepSeek V4 Pro · Claude Opus 4.8 vs Claude Sonnet 5 · DeepSeek V4 Pro vs GPT-5.5 · Claude Opus 4.8 vs GPT-5.5 · Claude Fable 5 vs DeepSeek V4 Pro · DeepSeek V4 Pro vs GPT-5.6 Sol

Full ranking: Best AI for emotional support · model pages: Claude Opus 4.8, DeepSeek V4 Pro