DeepSeek V4 Pro vs GPT-5.6 Sol for social media posts

The verdict

GPT-5.6 Sol wins, 100–94

Same 12 social media posts tasks, marked blind by three rival labs. GPT-5.6 Sol took 5 tasks, DeepSeek V4 Pro took 0, 7 tied. Tested 16 Aug 2026.

Where they differed most

The task — X thread that earns its length

Write a 4-post X thread (label each 1/4 to 4/4, max 40 words per post) explaining why small shops should list prices on their website. Each post must contain one concrete fact or example — no post may be pure transition or throat-clearing.

DeepSeek V4 Pro8/10

1/4  
21% of shoppers abandon a purchase because they can’t see total cost upfront (Baymard Institute). Hidden prices don’t protect your quote process—they filter out ready buyers before you ever talk.

2/4  
A small custom furniture shop added starting prices to its service page. Quote requests rose 40% in one month, while “just curious” calls dropped. Transparent pricing pre-qualifies leads for you.

3/4  
Gartner found B2B buyers spend 27% of the purchase process researching independently online. No price on your site means they skip you for…

GPT-5.6 Sol10/10

**1/4** Visible prices reduce friction. A customer who sees “haircuts from $35” can book immediately instead of leaving your site to compare or message competitors.

**2/4** Prices qualify leads before they contact you. If a custom cake starts at $80, shoppers with a $30 budget know early—saving everyone an awkward exchange.

**3/4** Published prices save staff time. Answering “How much is it?” ten times daily can become one clear menu showing a $12 lunch special or $25 repair fee.

**4/4** Transparency builds trust and prevents surprises. List…

Task by task

Task	DeepSeek V4 Pro	GPT-5.6 Sol
LinkedIn without the cringe	10	10
X thread that earns its length	8	10
Announce without announcing	10	10
Turn a review into a post	10	10
Disagree agreeably	9	10
The unsexy business	9	10
Say less	10	10
Hook without bait	10	10
Post about a mistake	9	10
Event post with the facts	10	10
Know when not to post	8	10
Refuse the astroturf	10	10

Full receipts: DeepSeek V4 Pro, GPT-5.6 Sol · judges claude-sonnet-5, gemini-3.1-pro-preview, gpt-5.6-terra

Questions people ask

Which is better for social media posts: DeepSeek V4 Pro or GPT-5.6 Sol?

GPT-5.6 Sol — it scored 100/100 against 94/100 on our 12-task social media posts suite, winning 5 tasks to 0 with 7 tied. Every answer was marked blind by three judges from three rival AI labs.

How was this tested?

Both models answered the identical published social media posts 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 social media posts head-to-heads: GPT-5.6 Sol vs GPT-5.6 Terra · GPT-5.3-Codex vs GPT-5.6 Sol · GPT-5.6 Luna vs GPT-5.6 Sol · Claude Opus 4.8 vs GPT-5.6 Sol · GPT-5.5 vs GPT-5.6 Sol · GPT-5.6 Sol vs Grok 4.5

Full ranking: Best AI for social media posts · model pages: DeepSeek V4 Pro, GPT-5.6 Sol